From 1f497271b5cab6912a890fe6708753479638ba7b Mon Sep 17 00:00:00 2001
From: Jerome Wu <jeromewus@gmail.com>
Date: Tue, 14 May 2019 11:43:28 +0800
Subject: [PATCH] Update README.md and add error handler in loadImage

---
 README.md                 |  3 +++
 dist/tesseract.js         | 27 +++++++++++++++++++--------
 dist/tesseract.min.js     |  2 +-
 dist/tesseract.min.js.map |  2 +-
 src/browser/index.js      |  8 ++++----
 5 files changed, 28 insertions(+), 14 deletions(-)

diff --git a/README.md b/README.md
index 5d8bebc..cdad610 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,9 @@ Tesseract.js wraps an [emscripten](https://github.com/kripken/emscripten) [port]
 
 
 # Installation
+
+**Tesseract.js v2 alpha is now available!! Check [HERE](https://github.com/naptha/tesseract.js) for more information.**
+
 Tesseract.js works with a `<script>` tag via local copy or CDN, with webpack and Browserify via `npm`, and on Node.js via `npm`. [Check out the docs](#docs) for a full treatment of the API.
 
 ## &lt;script />
diff --git a/dist/tesseract.js b/dist/tesseract.js
index a06bc61..152b2c0 100644
--- a/dist/tesseract.js
+++ b/dist/tesseract.js
@@ -253,9 +253,11 @@ if (process.env.TESS_ENV === "development") {
 exports.defaultOptions = defaultOptions;
 
 exports.spawnWorker = function spawnWorker(instance, workerOptions) {
-    if (window.Blob && window.URL) {
-        var blob = new Blob(['importScripts("' + workerOptions.workerPath + '");']);
-        var worker = new Worker(window.URL.createObjectURL(blob));
+    if (Blob && URL) {
+        var blob = new Blob(['importScripts("' + workerOptions.workerPath + '");'], {
+            type: 'application/javascript'
+        });
+        var worker = new Worker(URL.createObjectURL(blob));
     } else {
         var worker = new Worker(workerOptions.workerPath);
     }
@@ -290,20 +292,26 @@ function loadImage(image, cb) {
             im.onload = function (e) {
                 return loadImage(im, cb);
             };
+            im.onerror = function (e) {
+                throw e;
+            };
             return;
         } else {
             var xhr = new XMLHttpRequest();
             xhr.open('GET', image, true);
             xhr.responseType = "blob";
+
             xhr.onload = function (e) {
-                return loadImage(xhr.response, cb);
+                if (xhr.status >= 400) {
+                    throw new Error('Fail to get image as Blob');
+                } else {
+                    loadImage(xhr.response, cb);
+                }
             };
             xhr.onerror = function (e) {
-                if (/^https?:\/\//.test(image) && !/^https:\/\/crossorigin.me/.test(image)) {
-                    console.debug('Attempting to load image with CORS proxy');
-                    loadImage('https://crossorigin.me/' + image, cb);
-                }
+                throw e;
             };
+
             xhr.send(null);
             return;
         }
@@ -313,6 +321,9 @@ function loadImage(image, cb) {
         fr.onload = function (e) {
             return loadImage(fr.result, cb);
         };
+        fr.onerror = function (e) {
+            throw e;
+        };
         fr.readAsDataURL(image);
         return;
     } else if (image instanceof Blob) {
diff --git a/dist/tesseract.min.js b/dist/tesseract.min.js
index 85ae181..10957ba 100644
--- a/dist/tesseract.min.js
+++ b/dist/tesseract.min.js
@@ -1 +1 @@
-(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.Tesseract=f()}})(function(){var define,module,exports;return function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s}({1:[function(require,module,exports){var process=module.exports={};var cachedSetTimeout;var cachedClearTimeout;function defaultSetTimout(){throw new Error("setTimeout has not been 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clearTimeout(marker)}try{return cachedClearTimeout(marker)}catch(e){try{return cachedClearTimeout.call(null,marker)}catch(e){return cachedClearTimeout.call(this,marker)}}}var queue=[];var draining=false;var currentQueue;var queueIndex=-1;function cleanUpNextTick(){if(!draining||!currentQueue){return}draining=false;if(currentQueue.length){queue=currentQueue.concat(queue)}else{queueIndex=-1}if(queue.length){drainQueue()}}function drainQueue(){if(draining){return}var timeout=runTimeout(cleanUpNextTick);draining=true;var len=queue.length;while(len){currentQueue=queue;queue=[];while(++queueIndex<len){if(currentQueue){currentQueue[queueIndex].run()}}queueIndex=-1;len=queue.length}currentQueue=null;draining=false;runClearTimeout(timeout)}process.nextTick=function(fun){var args=new Array(arguments.length-1);if(arguments.length>1){for(var i=1;i<arguments.length;i++){args[i-1]=arguments[i]}}queue.push(new Item(fun,args));if(queue.length===1&&!draining){runTimeout(drainQueue)}};function Item(fun,array){this.fun=fun;this.array=array}Item.prototype.run=function(){this.fun.apply(null,this.array)};process.title="browser";process.browser=true;process.env={};process.argv=[];process.version="";process.versions={};function noop(){}process.on=noop;process.addListener=noop;process.once=noop;process.off=noop;process.removeListener=noop;process.removeAllListeners=noop;process.emit=noop;process.prependListener=noop;process.prependOnceListener=noop;process.listeners=function(name){return[]};process.binding=function(name){throw new Error("process.binding is not supported")};process.cwd=function(){return"/"};process.chdir=function(dir){throw new Error("process.chdir is not supported")};process.umask=function(){return 0}},{}],2:[function(require,module,exports){module.exports={name:"tesseract.js",version:"1.0.16",description:"Pure Javascript Multilingual OCR",main:"src/index.js",scripts:{start:'concurrently --kill-others "watchify src/index.js  -t [ envify --TESS_ENV development ] -t [ babelify --presets [ es2015 ] ] -o dist/tesseract.dev.js --standalone Tesseract" "watchify src/browser/worker.js  -t [ envify --TESS_ENV development ] -t [ babelify --presets [ es2015 ] ] -o dist/worker.dev.js" "http-server -p 7355"',build:"browserify src/index.js -t [ babelify --presets [ es2015 ] ] -o dist/tesseract.js --standalone Tesseract && browserify src/browser/worker.js -t [ babelify --presets [ es2015 ] ] -o dist/worker.js && uglifyjs dist/tesseract.js --source-map -o dist/tesseract.min.js && uglifyjs dist/worker.js --source-map -o dist/worker.min.js",release:"npm run build && git commit -am 'new release' && git push && git tag `jq -r '.version' package.json` && git push origin --tags && npm publish"},browser:{"./src/node/index.js":"./src/browser/index.js"},author:"",license:"Apache-2.0",devDependencies:{"babel-preset-es2015":"^6.16.0",babelify:"^7.3.0",browserify:"^13.1.0",concurrently:"^3.1.0",envify:"^3.4.1","http-server":"^0.9.0",pako:"^1.0.3","uglify-js":"^3.4.9",watchify:"^3.7.0"},dependencies:{"file-type":"^3.8.0","isomorphic-fetch":"^2.2.1","is-url":"1.2.2","jpeg-js":"^0.2.0","level-js":"^2.2.4","node-fetch":"^1.6.3","object-assign":"^4.1.0","png.js":"^0.2.1","tesseract.js-core":"^1.0.2"},repository:{type:"git",url:"https://github.com/naptha/tesseract.js.git"},bugs:{url:"https://github.com/naptha/tesseract.js/issues"},homepage:"https://github.com/naptha/tesseract.js"}},{}],3:[function(require,module,exports){(function(process){"use strict";var defaultOptions={corePath:"https://cdn.jsdelivr.net/gh/naptha/tesseract.js-core@0.1.0/index.js",langPath:"https://tessdata.projectnaptha.com/3.02/"};if(process.env.TESS_ENV==="development"){console.debug("Using Development Configuration");defaultOptions.workerPath=location.protocol+"//"+location.host+"/dist/worker.dev.js?nocache="+Math.random().toString(36).slice(3)}else{var version=require("../../package.json").version;defaultOptions.workerPath="https://cdn.jsdelivr.net/gh/naptha/tesseract.js@"+version+"/dist/worker.js"}exports.defaultOptions=defaultOptions;exports.spawnWorker=function spawnWorker(instance,workerOptions){if(window.Blob&&window.URL){var blob=new Blob(['importScripts("'+workerOptions.workerPath+'");']);var worker=new Worker(window.URL.createObjectURL(blob))}else{var worker=new Worker(workerOptions.workerPath)}worker.onmessage=function(e){var packet=e.data;instance._recv(packet)};return worker};exports.terminateWorker=function(instance){instance.worker.terminate()};exports.sendPacket=function sendPacket(instance,packet){loadImage(packet.payload.image,function(img){packet.payload.image=img;instance.worker.postMessage(packet)})};function loadImage(image,cb){if(typeof image==="string"){if(/^\#/.test(image)){return loadImage(document.querySelector(image),cb)}else if(/(blob|data)\:/.test(image)){var im=new Image;im.src=image;im.onload=function(e){return loadImage(im,cb)};return}else{var xhr=new XMLHttpRequest;xhr.open("GET",image,true);xhr.responseType="blob";xhr.onload=function(e){return loadImage(xhr.response,cb)};xhr.onerror=function(e){if(/^https?:\/\//.test(image)&&!/^https:\/\/crossorigin.me/.test(image)){console.debug("Attempting to load image with CORS proxy");loadImage("https://crossorigin.me/"+image,cb)}};xhr.send(null);return}}else if(image instanceof File){var fr=new FileReader;fr.onload=function(e){return loadImage(fr.result,cb)};fr.readAsDataURL(image);return}else if(image instanceof Blob){return loadImage(URL.createObjectURL(image),cb)}else if(image.getContext){return loadImage(image.getContext("2d"),cb)}else if(image.tagName=="IMG"||image.tagName=="VIDEO"){var c=document.createElement("canvas");c.width=image.naturalWidth||image.videoWidth;c.height=image.naturalHeight||image.videoHeight;var ctx=c.getContext("2d");ctx.drawImage(image,0,0);return loadImage(ctx,cb)}else if(image.getImageData){var data=image.getImageData(0,0,image.canvas.width,image.canvas.height);return loadImage(data,cb)}else{return cb(image)}throw new Error("Missing return in loadImage cascade")}}).call(this,require("_process"))},{"../../package.json":2,_process:1}],4:[function(require,module,exports){"use strict";module.exports=function circularize(page){page.paragraphs=[];page.lines=[];page.words=[];page.symbols=[];page.blocks.forEach(function(block){block.page=page;block.lines=[];block.words=[];block.symbols=[];block.paragraphs.forEach(function(para){para.block=block;para.page=page;para.words=[];para.symbols=[];para.lines.forEach(function(line){line.paragraph=para;line.block=block;line.page=page;line.symbols=[];line.words.forEach(function(word){word.line=line;word.paragraph=para;word.block=block;word.page=page;word.symbols.forEach(function(sym){sym.word=word;sym.line=line;sym.paragraph=para;sym.block=block;sym.page=page;sym.line.symbols.push(sym);sym.paragraph.symbols.push(sym);sym.block.symbols.push(sym);sym.page.symbols.push(sym)});word.paragraph.words.push(word);word.block.words.push(word);word.page.words.push(word)});line.block.lines.push(line);line.page.lines.push(line)});para.page.paragraphs.push(para)})});return page}},{}],5:[function(require,module,exports){"use strict";var _createClass=function(){function defineProperties(target,props){for(var i=0;i<props.length;i++){var descriptor=props[i];descriptor.enumerable=descriptor.enumerable||false;descriptor.configurable=true;if("value"in descriptor)descriptor.writable=true;Object.defineProperty(target,descriptor.key,descriptor)}}return function(Constructor,protoProps,staticProps){if(protoProps)defineProperties(Constructor.prototype,protoProps);if(staticProps)defineProperties(Constructor,staticProps);return Constructor}}();function _classCallCheck(instance,Constructor){if(!(instance instanceof Constructor)){throw new TypeError("Cannot call a class as a function")}}var adapter=require("../node/index.js");var jobCounter=0;module.exports=function(){function TesseractJob(instance){_classCallCheck(this,TesseractJob);this.id="Job-"+ ++jobCounter+"-"+Math.random().toString(16).slice(3,8);this._instance=instance;this._resolve=[];this._reject=[];this._progress=[];this._finally=[]}_createClass(TesseractJob,[{key:"then",value:function then(resolve,reject){if(this._resolve.push){this._resolve.push(resolve)}else{resolve(this._resolve)}if(reject)this.catch(reject);return this}},{key:"catch",value:function _catch(reject){if(this._reject.push){this._reject.push(reject)}else{reject(this._reject)}return this}},{key:"progress",value:function progress(fn){this._progress.push(fn);return this}},{key:"finally",value:function _finally(fn){this._finally.push(fn);return this}},{key:"_send",value:function _send(action,payload){adapter.sendPacket(this._instance,{jobId:this.id,action:action,payload:payload})}},{key:"_handle",value:function _handle(packet){var data=packet.data;var runFinallyCbs=false;if(packet.status==="resolve"){if(this._resolve.length===0)console.log(data);this._resolve.forEach(function(fn){var ret=fn(data);if(ret&&typeof ret.then=="function"){console.warn("TesseractJob instances do not chain like ES6 Promises. To convert it into a real promise, use Promise.resolve.")}});this._resolve=data;this._instance._dequeue();runFinallyCbs=true}else if(packet.status==="reject"){if(this._reject.length===0)console.error(data);this._reject.forEach(function(fn){return fn(data)});this._reject=data;this._instance._dequeue();runFinallyCbs=true}else if(packet.status==="progress"){this._progress.forEach(function(fn){return fn(data)})}else{console.warn("Message type unknown",packet.status)}if(runFinallyCbs){this._finally.forEach(function(fn){return fn(data)})}}}]);return TesseractJob}()},{"../node/index.js":3}],6:[function(require,module,exports){"use strict";var _createClass=function(){function defineProperties(target,props){for(var i=0;i<props.length;i++){var descriptor=props[i];descriptor.enumerable=descriptor.enumerable||false;descriptor.configurable=true;if("value"in descriptor)descriptor.writable=true;Object.defineProperty(target,descriptor.key,descriptor)}}return function(Constructor,protoProps,staticProps){if(protoProps)defineProperties(Constructor.prototype,protoProps);if(staticProps)defineProperties(Constructor,staticProps);return Constructor}}();function _classCallCheck(instance,Constructor){if(!(instance instanceof Constructor)){throw new TypeError("Cannot call a class as a function")}}var adapter=require("./node/index.js");var circularize=require("./common/circularize.js");var TesseractJob=require("./common/job");var version=require("../package.json").version;var create=function create(){var workerOptions=arguments.length>0&&arguments[0]!==undefined?arguments[0]:{};var worker=new TesseractWorker(Object.assign({},adapter.defaultOptions,workerOptions));worker.create=create;worker.version=version;return worker};var TesseractWorker=function(){function TesseractWorker(workerOptions){_classCallCheck(this,TesseractWorker);this.worker=null;this.workerOptions=workerOptions;this._currentJob=null;this._queue=[]}_createClass(TesseractWorker,[{key:"recognize",value:function recognize(image){var _this=this;var options=arguments.length>1&&arguments[1]!==undefined?arguments[1]:{};return this._delay(function(job){if(typeof options==="string")options={lang:options};options.lang=options.lang||"eng";job._send("recognize",{image:image,options:options,workerOptions:_this.workerOptions})})}},{key:"detect",value:function detect(image){var _this2=this;var options=arguments.length>1&&arguments[1]!==undefined?arguments[1]:{};return this._delay(function(job){job._send("detect",{image:image,options:options,workerOptions:_this2.workerOptions})})}},{key:"terminate",value:function terminate(){if(this.worker)adapter.terminateWorker(this);this.worker=null;this._currentJob=null;this._queue=[]}},{key:"_delay",value:function _delay(fn){var _this3=this;if(!this.worker)this.worker=adapter.spawnWorker(this,this.workerOptions);var job=new TesseractJob(this);this._queue.push(function(e){_this3._queue.shift();_this3._currentJob=job;fn(job)});if(!this._currentJob)this._dequeue();return job}},{key:"_dequeue",value:function _dequeue(){this._currentJob=null;if(this._queue.length){this._queue[0]()}}},{key:"_recv",value:function _recv(packet){if(packet.status==="resolve"&&packet.action==="recognize"){packet.data=circularize(packet.data)}if(this._currentJob.id===packet.jobId){this._currentJob._handle(packet)}else{console.warn("Job ID "+packet.jobId+" not known.")}}}]);return TesseractWorker}();module.exports=create()},{"../package.json":2,"./common/circularize.js":4,"./common/job":5,"./node/index.js":3}]},{},[6])(6)});
\ No newline at end of file
+(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.Tesseract=f()}})(function(){var define,module,exports;return function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s}({1:[function(require,module,exports){var process=module.exports={};var cachedSetTimeout;var cachedClearTimeout;function defaultSetTimout(){throw new Error("setTimeout has not been 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clearTimeout(marker)}try{return cachedClearTimeout(marker)}catch(e){try{return cachedClearTimeout.call(null,marker)}catch(e){return cachedClearTimeout.call(this,marker)}}}var queue=[];var draining=false;var currentQueue;var queueIndex=-1;function cleanUpNextTick(){if(!draining||!currentQueue){return}draining=false;if(currentQueue.length){queue=currentQueue.concat(queue)}else{queueIndex=-1}if(queue.length){drainQueue()}}function drainQueue(){if(draining){return}var timeout=runTimeout(cleanUpNextTick);draining=true;var len=queue.length;while(len){currentQueue=queue;queue=[];while(++queueIndex<len){if(currentQueue){currentQueue[queueIndex].run()}}queueIndex=-1;len=queue.length}currentQueue=null;draining=false;runClearTimeout(timeout)}process.nextTick=function(fun){var args=new Array(arguments.length-1);if(arguments.length>1){for(var i=1;i<arguments.length;i++){args[i-1]=arguments[i]}}queue.push(new Item(fun,args));if(queue.length===1&&!draining){runTimeout(drainQueue)}};function Item(fun,array){this.fun=fun;this.array=array}Item.prototype.run=function(){this.fun.apply(null,this.array)};process.title="browser";process.browser=true;process.env={};process.argv=[];process.version="";process.versions={};function noop(){}process.on=noop;process.addListener=noop;process.once=noop;process.off=noop;process.removeListener=noop;process.removeAllListeners=noop;process.emit=noop;process.prependListener=noop;process.prependOnceListener=noop;process.listeners=function(name){return[]};process.binding=function(name){throw new Error("process.binding is not supported")};process.cwd=function(){return"/"};process.chdir=function(dir){throw new Error("process.chdir is not supported")};process.umask=function(){return 0}},{}],2:[function(require,module,exports){module.exports={name:"tesseract.js",version:"1.0.16",description:"Pure Javascript Multilingual OCR",main:"src/index.js",scripts:{start:'concurrently --kill-others "watchify src/index.js  -t [ envify --TESS_ENV development ] -t [ babelify --presets [ es2015 ] ] -o dist/tesseract.dev.js --standalone Tesseract" "watchify src/browser/worker.js  -t [ envify --TESS_ENV development ] -t [ babelify --presets [ es2015 ] ] -o dist/worker.dev.js" "http-server -p 7355"',build:"browserify src/index.js -t [ babelify --presets [ es2015 ] ] -o dist/tesseract.js --standalone Tesseract && browserify src/browser/worker.js -t [ babelify --presets [ es2015 ] ] -o dist/worker.js && uglifyjs dist/tesseract.js --source-map -o dist/tesseract.min.js && uglifyjs dist/worker.js --source-map -o dist/worker.min.js",release:"npm run build && git commit -am 'new release' && git push && git tag `jq -r '.version' package.json` && git push origin --tags && npm publish"},browser:{"./src/node/index.js":"./src/browser/index.js"},author:"",license:"Apache-2.0",devDependencies:{"babel-preset-es2015":"^6.16.0",babelify:"^7.3.0",browserify:"^13.1.0",concurrently:"^3.1.0",envify:"^3.4.1","http-server":"^0.9.0",pako:"^1.0.3","uglify-js":"^3.4.9",watchify:"^3.7.0"},dependencies:{"file-type":"^3.8.0","isomorphic-fetch":"^2.2.1","is-url":"1.2.2","jpeg-js":"^0.2.0","level-js":"^2.2.4","node-fetch":"^1.6.3","object-assign":"^4.1.0","png.js":"^0.2.1","tesseract.js-core":"^1.0.2"},repository:{type:"git",url:"https://github.com/naptha/tesseract.js.git"},bugs:{url:"https://github.com/naptha/tesseract.js/issues"},homepage:"https://github.com/naptha/tesseract.js"}},{}],3:[function(require,module,exports){(function(process){"use strict";var defaultOptions={corePath:"https://cdn.jsdelivr.net/gh/naptha/tesseract.js-core@0.1.0/index.js",langPath:"https://tessdata.projectnaptha.com/3.02/"};if(process.env.TESS_ENV==="development"){console.debug("Using Development Configuration");defaultOptions.workerPath=location.protocol+"//"+location.host+"/dist/worker.dev.js?nocache="+Math.random().toString(36).slice(3)}else{var version=require("../../package.json").version;defaultOptions.workerPath="https://cdn.jsdelivr.net/gh/naptha/tesseract.js@"+version+"/dist/worker.js"}exports.defaultOptions=defaultOptions;exports.spawnWorker=function spawnWorker(instance,workerOptions){if(Blob&&URL){var blob=new Blob(['importScripts("'+workerOptions.workerPath+'");'],{type:"application/javascript"});var worker=new Worker(URL.createObjectURL(blob))}else{var worker=new Worker(workerOptions.workerPath)}worker.onmessage=function(e){var packet=e.data;instance._recv(packet)};return worker};exports.terminateWorker=function(instance){instance.worker.terminate()};exports.sendPacket=function sendPacket(instance,packet){loadImage(packet.payload.image,function(img){packet.payload.image=img;instance.worker.postMessage(packet)})};function loadImage(image,cb){if(typeof image==="string"){if(/^\#/.test(image)){return loadImage(document.querySelector(image),cb)}else if(/(blob|data)\:/.test(image)){var im=new Image;im.src=image;im.onload=function(e){return loadImage(im,cb)};im.onerror=function(e){throw e};return}else{var xhr=new XMLHttpRequest;xhr.open("GET",image,true);xhr.responseType="blob";xhr.onload=function(e){if(xhr.status>=400){throw new Error("Fail to get image as Blob")}else{loadImage(xhr.response,cb)}};xhr.onerror=function(e){throw e};xhr.send(null);return}}else if(image instanceof File){var fr=new FileReader;fr.onload=function(e){return loadImage(fr.result,cb)};fr.onerror=function(e){throw e};fr.readAsDataURL(image);return}else if(image instanceof Blob){return loadImage(URL.createObjectURL(image),cb)}else if(image.getContext){return loadImage(image.getContext("2d"),cb)}else if(image.tagName=="IMG"||image.tagName=="VIDEO"){var c=document.createElement("canvas");c.width=image.naturalWidth||image.videoWidth;c.height=image.naturalHeight||image.videoHeight;var ctx=c.getContext("2d");ctx.drawImage(image,0,0);return loadImage(ctx,cb)}else if(image.getImageData){var data=image.getImageData(0,0,image.canvas.width,image.canvas.height);return loadImage(data,cb)}else{return cb(image)}throw new Error("Missing return in loadImage cascade")}}).call(this,require("_process"))},{"../../package.json":2,_process:1}],4:[function(require,module,exports){"use strict";module.exports=function circularize(page){page.paragraphs=[];page.lines=[];page.words=[];page.symbols=[];page.blocks.forEach(function(block){block.page=page;block.lines=[];block.words=[];block.symbols=[];block.paragraphs.forEach(function(para){para.block=block;para.page=page;para.words=[];para.symbols=[];para.lines.forEach(function(line){line.paragraph=para;line.block=block;line.page=page;line.symbols=[];line.words.forEach(function(word){word.line=line;word.paragraph=para;word.block=block;word.page=page;word.symbols.forEach(function(sym){sym.word=word;sym.line=line;sym.paragraph=para;sym.block=block;sym.page=page;sym.line.symbols.push(sym);sym.paragraph.symbols.push(sym);sym.block.symbols.push(sym);sym.page.symbols.push(sym)});word.paragraph.words.push(word);word.block.words.push(word);word.page.words.push(word)});line.block.lines.push(line);line.page.lines.push(line)});para.page.paragraphs.push(para)})});return page}},{}],5:[function(require,module,exports){"use strict";var _createClass=function(){function defineProperties(target,props){for(var i=0;i<props.length;i++){var descriptor=props[i];descriptor.enumerable=descriptor.enumerable||false;descriptor.configurable=true;if("value"in descriptor)descriptor.writable=true;Object.defineProperty(target,descriptor.key,descriptor)}}return function(Constructor,protoProps,staticProps){if(protoProps)defineProperties(Constructor.prototype,protoProps);if(staticProps)defineProperties(Constructor,staticProps);return Constructor}}();function _classCallCheck(instance,Constructor){if(!(instance instanceof Constructor)){throw new TypeError("Cannot call a class as a function")}}var adapter=require("../node/index.js");var jobCounter=0;module.exports=function(){function TesseractJob(instance){_classCallCheck(this,TesseractJob);this.id="Job-"+ ++jobCounter+"-"+Math.random().toString(16).slice(3,8);this._instance=instance;this._resolve=[];this._reject=[];this._progress=[];this._finally=[]}_createClass(TesseractJob,[{key:"then",value:function then(resolve,reject){if(this._resolve.push){this._resolve.push(resolve)}else{resolve(this._resolve)}if(reject)this.catch(reject);return this}},{key:"catch",value:function _catch(reject){if(this._reject.push){this._reject.push(reject)}else{reject(this._reject)}return this}},{key:"progress",value:function progress(fn){this._progress.push(fn);return this}},{key:"finally",value:function _finally(fn){this._finally.push(fn);return this}},{key:"_send",value:function _send(action,payload){adapter.sendPacket(this._instance,{jobId:this.id,action:action,payload:payload})}},{key:"_handle",value:function _handle(packet){var data=packet.data;var runFinallyCbs=false;if(packet.status==="resolve"){if(this._resolve.length===0)console.log(data);this._resolve.forEach(function(fn){var ret=fn(data);if(ret&&typeof ret.then=="function"){console.warn("TesseractJob instances do not chain like ES6 Promises. To convert it into a real promise, use Promise.resolve.")}});this._resolve=data;this._instance._dequeue();runFinallyCbs=true}else if(packet.status==="reject"){if(this._reject.length===0)console.error(data);this._reject.forEach(function(fn){return fn(data)});this._reject=data;this._instance._dequeue();runFinallyCbs=true}else if(packet.status==="progress"){this._progress.forEach(function(fn){return fn(data)})}else{console.warn("Message type unknown",packet.status)}if(runFinallyCbs){this._finally.forEach(function(fn){return fn(data)})}}}]);return TesseractJob}()},{"../node/index.js":3}],6:[function(require,module,exports){"use strict";var _createClass=function(){function defineProperties(target,props){for(var i=0;i<props.length;i++){var descriptor=props[i];descriptor.enumerable=descriptor.enumerable||false;descriptor.configurable=true;if("value"in descriptor)descriptor.writable=true;Object.defineProperty(target,descriptor.key,descriptor)}}return function(Constructor,protoProps,staticProps){if(protoProps)defineProperties(Constructor.prototype,protoProps);if(staticProps)defineProperties(Constructor,staticProps);return Constructor}}();function _classCallCheck(instance,Constructor){if(!(instance instanceof Constructor)){throw new TypeError("Cannot call a class as a function")}}var adapter=require("./node/index.js");var circularize=require("./common/circularize.js");var TesseractJob=require("./common/job");var version=require("../package.json").version;var create=function create(){var workerOptions=arguments.length>0&&arguments[0]!==undefined?arguments[0]:{};var worker=new TesseractWorker(Object.assign({},adapter.defaultOptions,workerOptions));worker.create=create;worker.version=version;return worker};var TesseractWorker=function(){function TesseractWorker(workerOptions){_classCallCheck(this,TesseractWorker);this.worker=null;this.workerOptions=workerOptions;this._currentJob=null;this._queue=[]}_createClass(TesseractWorker,[{key:"recognize",value:function recognize(image){var _this=this;var options=arguments.length>1&&arguments[1]!==undefined?arguments[1]:{};return this._delay(function(job){if(typeof options==="string")options={lang:options};options.lang=options.lang||"eng";job._send("recognize",{image:image,options:options,workerOptions:_this.workerOptions})})}},{key:"detect",value:function detect(image){var _this2=this;var options=arguments.length>1&&arguments[1]!==undefined?arguments[1]:{};return this._delay(function(job){job._send("detect",{image:image,options:options,workerOptions:_this2.workerOptions})})}},{key:"terminate",value:function terminate(){if(this.worker)adapter.terminateWorker(this);this.worker=null;this._currentJob=null;this._queue=[]}},{key:"_delay",value:function _delay(fn){var _this3=this;if(!this.worker)this.worker=adapter.spawnWorker(this,this.workerOptions);var job=new TesseractJob(this);this._queue.push(function(e){_this3._queue.shift();_this3._currentJob=job;fn(job)});if(!this._currentJob)this._dequeue();return job}},{key:"_dequeue",value:function _dequeue(){this._currentJob=null;if(this._queue.length){this._queue[0]()}}},{key:"_recv",value:function _recv(packet){if(packet.status==="resolve"&&packet.action==="recognize"){packet.data=circularize(packet.data)}if(this._currentJob.id===packet.jobId){this._currentJob._handle(packet)}else{console.warn("Job ID "+packet.jobId+" not known.")}}}]);return TesseractWorker}();module.exports=create()},{"../package.json":2,"./common/circularize.js":4,"./common/job":5,"./node/index.js":3}]},{},[6])(6)});
\ No newline at end of file
diff --git a/dist/tesseract.min.js.map b/dist/tesseract.min.js.map
index b59a3eb..ec4ed9d 100644
--- a/dist/tesseract.min.js.map
+++ b/dist/tesseract.min.js.map
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\ No newline at end of file
diff --git a/src/browser/index.js b/src/browser/index.js
index 9c1b397..40c710a 100644
--- a/src/browser/index.js
+++ b/src/browser/index.js
@@ -54,7 +54,7 @@ function loadImage(image, cb){
             var im = new Image
             im.src = image;
             im.onload = e => loadImage(im, cb);
-            //im.onerror = e => ?; TODO handle error
+            im.onerror = e => { throw e; };
             return
         }else{
             var xhr = new XMLHttpRequest();
@@ -63,12 +63,12 @@ function loadImage(image, cb){
             
             xhr.onload = e => {
                 if (xhr.status >= 400){
-                    //TODO handle error
+                  throw new Error('Fail to get image as Blob');
                 }else{
                     loadImage(xhr.response, cb);
                 }
             };
-            //xhr.onerror = e => ?; TODO handle error
+            xhr.onerror = e => { throw e; }; 
             
             xhr.send(null)
             return
@@ -77,7 +77,7 @@ function loadImage(image, cb){
         // files
         var fr = new FileReader()
         fr.onload = e => loadImage(fr.result, cb);
-        //fr.onerror = e => ?; TODO handle error
+        fr.onerror = e => { throw e; }; 
         fr.readAsDataURL(image)
         return
     }else if(image instanceof Blob){