How can I count pixel of particular color in image?

15 次查看（过去 30 天）

显示更早的评论

GeonWoo Jeon 2017-10-31

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/364315-how-can-i-count-pixel-of-particular-color-in-image

评论： Image Analyst 2021-6-10

采纳的回答： Image Analyst

I want to count the number of pixels with particular color in the image below. What function can I use to count pixels?

The size of this image is 672*708*3.

采纳的回答

Image Analyst 2017-10-31

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/364315-how-can-i-count-pixel-of-particular-color-in-image#answer_288717

在 MATLAB Online 中打开

For example, to get the number of yellow pixels:

yellowPixels = rgbImage(:,:,1) == 255 & rgbImage(:,:,2) == 255 & rgbImage(:,:,3) == 0;
numYellowPixels = sum(yellowPixels(:));

To get the number of blue pixels:

bluePixels = rgbImage(:,:,1) == 0 & rgbImage(:,:,2) == 0 & rgbImage(:,:,3) == 255;
numBluePixels = sum(bluePixels(:));

9 个评论
显示 7更早的评论隐藏 7更早的评论

Iszuzuldin amirull bin mohd janudin 2021-6-9

mask= g_channel > 100, b_channel > 800, r_channel < 800, b_channel < 0, r_channel < 0;

numBlackPixels = sum(~mask(:))

how can i change to yellow mask ?

Image Analyst 2021-6-10

@Iszuzuldin amirull bin mohd janudin, try using the Color Thresholder app on the Apps tab of the tool ribbon. Segment your image, probably using the HSV color space would be good. then tell it to export the code as a function that you can then call from your program.

请先登录，再进行评论。