How to calculate sum of black pixel in binary image?

6 次查看（过去 30 天）

显示更早的评论

akhil kumar 2016-3-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/272323-how-to-calculate-sum-of-black-pixel-in-binary-image

评论： Image Analyst 2019-8-2

采纳的回答： Image Analyst

I need to find sum of all black pixels present in my input image. How can I do it in simple way thanks in advance

采纳的回答

Image Analyst 2016-3-9

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/272323-how-to-calculate-sum-of-black-pixel-in-binary-image#answer_212932

在 MATLAB Online 中打开

Try this:

numBlackPixels = sum(yourImage == 0);

5 个评论
显示 3更早的评论隐藏 3更早的评论

mohd akmal masud 2019-8-1

编辑：Image Analyst 2019-8-2

在 MATLAB Online 中打开

Yes, i just want to know how many white pixels are in the red circle. If i use your code

props = regionprops(binaryImage, 'Area');
allAreas = [props.Area]

it calculates the white pixel area for all blobs right?

Image Analyst 2019-8-2

Yes, that's correct.

Let's say you have a bunch of blobs scattered around the image randomly. How are you going to tell MATLAB which blob you want? Is it always the left-most blob? Or the bottom-most blob? Or the one closest to the lower left corner? Or is it always the largest blob? Or do you want to click on one with ginput()?

Exactly how is the code supposed to know which of the bunch of blobs is the one you're thinking about?

请先登录，再进行评论。