How can I define red color in HSV space

Question

THUONG NGUYEN VAN 2013-5-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/74567-how-can-i-define-red-color-in-hsv-space

评论： Image Analyst 2013-11-10

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 colors

please 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;

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2013-5-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/74567-how-can-i-define-red-color-in-hsv-space#answer_84360

在 MATLAB Online 中打开

It is not possible for a number to be both less than 0.05 and greater than 0.97. Your statement

hueMaskred1 = (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 "|"