mirror of
https://github.com/peterbraden/node-opencv.git
synced 2025-12-08 19:45:55 +00:00
0520e6dcea
Added a moments method to the contour object and an example using resulting moments to display a cross at the "center of gravity" of a contour.
42 lines
985 B
JavaScript
Executable File
42 lines
985 B
JavaScript
Executable File
var cv = require('../lib/opencv');
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var lowThresh = 0;
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var highThresh = 100;
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var nIters = 2;
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var maxArea = 2500;
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var GREEN = [0, 255, 0]; //B, G, R
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var WHITE = [255, 255, 255]; //B, G, R
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var RED = [0, 0, 255]; //B, G, R
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cv.readImage('./stuff.png', function(err, im) {
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var big = new cv.Matrix(im.width(), im.height());
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var all = new cv.Matrix(im.width(), im.height());
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im.convertGrayscale();
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im_canny = im.copy();
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im_canny.canny(lowThresh, highThresh);
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im_canny.dilate(nIters);
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contours = im_canny.findContours();
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for(i = 0; i < contours.size(); i++) {
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if(contours.area(i) > maxArea) {
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var moments = contours.moments(i);
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var cgx = Math.round(moments.m10/moments.m00);
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var cgy = Math.round(moments.m01/moments.m00);
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big.drawContour(contours, i, GREEN);
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big.line([cgx - 5, cgy], [cgx + 5, cgy], RED);
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big.line([cgx, cgy - 5], [cgx, cgy + 5], RED);
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}
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}
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all.drawAllContours(contours, WHITE);
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big.save('./big.png');
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all.save('./all.png');
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});
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