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Merge pull request #65 from serratus/issue-38
closes #38 by adding node support
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| var Quagga = require('../lib/quagga'); | ||
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|
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| Quagga.decodeSingle({ | ||
| src: "../test/fixtures/code_128/image-001.jpg", | ||
| numOfWorkers: 0, | ||
| inputStream: { | ||
| size: 800, | ||
| area: { | ||
| top: "10%", | ||
| right: "5%", | ||
| left: "5%", | ||
| bottom: "10%" | ||
| } | ||
| } | ||
| }, function(result) { | ||
| if(result.codeResult) { | ||
| console.log("result", result.codeResult.code); | ||
| } else { | ||
| console.log("not detected"); | ||
| } | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| /* jshint undef: true, unused: true, browser:true, devel: true */ | ||
| /* global define */ | ||
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| define(["cv_utils"], function(CVUtils) { | ||
| "use strict"; | ||
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| var Ndarray = require("ndarray"), | ||
| Interp2D = require("ndarray-linear-interpolate").d2; | ||
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| var FrameGrabber = {}; | ||
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| FrameGrabber.create = function(inputStream) { | ||
| var _that = {}, | ||
| _streamConfig = inputStream.getConfig(), | ||
| _video_size = CVUtils.imageRef(inputStream.getRealWidth(), inputStream.getRealHeight()), | ||
| _canvasSize = inputStream.getCanvasSize(), | ||
| _size = CVUtils.imageRef(inputStream.getWidth(), inputStream.getHeight()), | ||
| _topRight = inputStream.getTopRight(), | ||
| _data = new Uint8Array(_size.x * _size.y), | ||
| _grayData = new Uint8Array(_video_size.x * _video_size.y), | ||
| _canvasData = new Uint8Array(_canvasSize.x * _canvasSize.y), | ||
| _grayImageArray = Ndarray(_grayData, [_video_size.y, _video_size.x]).transpose(1, 0), | ||
| _canvasImageArray = Ndarray(_canvasData, [_canvasSize.y, _canvasSize.x]).transpose(1, 0), | ||
| _targetImageArray = _canvasImageArray.hi(_topRight.x + _size.x, _topRight.y + _size.y).lo(_topRight.x, _topRight.y), | ||
| _stepSizeX = _video_size.x/_canvasSize.x, | ||
| _stepSizeY = _video_size.y/_canvasSize.y; | ||
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| console.log("FrameGrabber", JSON.stringify({ | ||
| videoSize: _grayImageArray.shape, | ||
| canvasSize: _canvasImageArray.shape, | ||
| stepSize: [_stepSizeX, _stepSizeY], | ||
| size: _targetImageArray.shape, | ||
| topRight: _topRight | ||
| })); | ||
|
|
||
| /** | ||
| * Uses the given array as frame-buffer | ||
| */ | ||
| _that.attachData = function(data) { | ||
| _data = data; | ||
| }; | ||
|
|
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| /** | ||
| * Returns the used frame-buffer | ||
| */ | ||
| _that.getData = function() { | ||
| return _data; | ||
| }; | ||
|
|
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| /** | ||
| * Fetches a frame from the input-stream and puts into the frame-buffer. | ||
| * The image-data is converted to gray-scale and then half-sampled if configured. | ||
| */ | ||
| _that.grab = function() { | ||
| var frame = inputStream.getFrame(); | ||
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|
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| if (frame) { | ||
| this.scaleAndCrop(frame); | ||
| return true; | ||
| } else { | ||
| return false; | ||
| } | ||
| }; | ||
|
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| _that.scaleAndCrop = function(frame) { | ||
| var x, | ||
| y; | ||
|
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| // 1. compute full-sized gray image | ||
| CVUtils.computeGray(frame.data, _grayData); | ||
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| // 2. interpolate | ||
| for (y = 0; y < _canvasSize.y; y++) { | ||
| for (x = 0; x < _canvasSize.x; x++) { | ||
| _canvasImageArray.set(x, y, (Interp2D(_grayImageArray, x * _stepSizeX, y * _stepSizeY)) | 0); | ||
| } | ||
| } | ||
|
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| // targetImageArray must be equal to targetSize | ||
| if (_targetImageArray.shape[0] !== _size.x || | ||
| _targetImageArray.shape[1] !== _size.y) { | ||
| throw new Error("Shapes do not match!"); | ||
| } | ||
|
|
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| // 3. crop | ||
| for (y = 0; y < _size.y; y++) { | ||
| for (x = 0; x < _size.x; x++) { | ||
| _data[y * _size.x + x] = _targetImageArray.get(x, y); | ||
| } | ||
| } | ||
| }, | ||
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| _that.getSize = function() { | ||
| return _size; | ||
| }; | ||
|
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| return _that; | ||
| }; | ||
|
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| return (FrameGrabber); | ||
| }); |
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