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42 lines
1.1 KiB
42 lines
1.1 KiB
6 years ago
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const { readImage } = require('tesseract.js-utils');
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/**
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* setImage
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*
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* @name setImage
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* @function set image in tesseract for recognition
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* @access public
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* @param {array} image - binary array in array format
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* @returns {number} - an emscripten pointer of the image
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*/
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module.exports = (TessModule, api, image, params) => {
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const {
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tessjs_image_rectangle_left: left,
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tessjs_image_rectangle_top: top,
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tessjs_image_rectangle_width: width,
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tessjs_image_rectangle_height: height,
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} = params;
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const {
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w, h, bytesPerPixel, data, pix,
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} = readImage(TessModule, Array.from(image));
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/*
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* As some image format (ex. bmp) is not supported natiely by tesseract,
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* sometimes it will not return pix directly, but data and bytesPerPixel
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* for another SetImage usage.
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*
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*/
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if (data === null) {
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api.SetImage(pix);
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} else {
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api.SetImage(data, w, h, bytesPerPixel, w * bytesPerPixel);
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}
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api.SetRectangle(
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(left < 0) ? 0 : left,
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(top < 0) ? 0 : top,
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(width < 0) ? w : width,
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(height < 0) ? h : height,
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);
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return data === null ? pix : data;
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};
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