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POcolor detection algorithm
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  1. POcolor detection algorithm
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    copied!<p>Im developing a system that uses kinect for image processing. The system needs to detect certain objects based on their colors (from the kinect image).</p> <p>My current solution is to use a window (of fixed size) and slide it through the whole image. I then count(in the window) the number of pixels that are green and compare it against some treshold. To check if the pixel is green i use a reference color (0x00FF00) and then calculate the distance of the current pixel to the reference color. </p> <p>The algorithm goes like this:</p> <pre><code>referenceColor = 0x00FF00; window_width = 10; window_height = 10; colorSum = 0; COLOR_TRESHOLD = 20; WINDOW_COLOR_TRESHOLD = 70; foreach (pixel in image) { colorSum = 0; for(i = 0; i &lt; window_width; i++) { for(j = 0; j &lt; window_height; j++) { //get the current pixel that is processed by the window curPixel = image.getPixelAt(i+pixel.indexX,j+pixel.indexY); // calculate the distance distance = sqrt((curPixel.r - referenceColor.r) ^ 2 + (curPixel.g - referenceColor.g) ^ 2 + (curPixel.b - referenceColor.b) ^ 2); // check if distance smaller than the treshold if(distance &lt;= COLOR_TRESHOLD) { // pixel is green colorSum++; } } } // check if there are enough green pixels in the image if(colorSum &gt; WINDOW_COLOR_TRESHOLD) { // green object detected } } </code></pre> <p>The problem with this algorithm is that if the color is to dark/bright (due to sunlight/reflections) it fails (and i have to change the tresholds to get good detection). Ideally i would like to archive that every green pixel/object will get detected (regardless of how bright/dark it is). Does any know any good (robust) algorithm to archive this? Would appreciate a point in the right direction. </p> <p>Thanks.</p>
 

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