How Can I Define Red Color In HSV Space - - MathWorks

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How can I define red color in HSV space Follow 3 views (last 30 days) Show older comments THUONG NGUYEN VAN on 4 May 2013

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Commented: Image Analyst on 10 Nov 2013 Accepted Answer: Walter Roberson Open in MATLAB Online I have problem when using webcam to detect and track object by masking colors in HSV space. my code work well with yellow, green or blue color but red color.I already define the threshold for these colorsplease help me.here is my code% red hueThresholdLowred1 = 0.05; hueThresholdHighred1 = 0.97; saturationThresholdLowbred1 = 0.3; saturationThresholdHighred1 = 1; valueThresholdLowred1 = 0.01; valueThresholdHighred1 = 1;% find red color hueMaskred1 = (hImage1 <= hueThresholdLowred1)&(hImage1 >= hueThresholdHighred1); saturationMaskred1 = (sImage1 >= saturationThresholdLowbred1) & (sImage1 <= saturationThresholdHighred1); valueMaskred1 = (vImage1 >= valueThresholdLowred1) & (vImage1 <= valueThresholdHighred1); redObjectsMask1 = hueMaskred1 & saturationMaskred1 & valueMaskred1;

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Walter Roberson on 4 May 2013

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Open in MATLAB Online It is not possible for a number to be both less than 0.05 and greater than 0.97. Your statementhueMaskred1 = (hImage1 <= hueThresholdLowred1)&(hImage1 >= hueThresholdHighred1);is wrong (at least in terms of the values you set for those thresholds.)Are you looking for values that are between 0.97 and 1, together with values that are between 0 and 0.05 ? Sounds like a narrow range to me, but if it is what you are looking for, change the "&" to "|"

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THUONG NGUYEN VAN on 15 May 2013 ×

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thanks for your help, I already changed as follow your advice. finally it work. aldi on 10 Nov 2013 ×

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how define green object on live webcam ? please code.. Image Analyst on 10 Nov 2013 ×

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See several color segmentation demos in my File Exchange:http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 Feel free to modify any of them.

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