how to calculate the total white dots/ white region in this image

2013 2 24
2 个回答
回答已采纳
2 次查看（30 天）

 采纳的回答

Jeppe
Jeppe 2013-2-24

0 个投票

To read in the image, use
M = imread('result2cars.jpg');
Because your image is a grayscale image, M is just a matrix. Each entry corresponds to one pixel. The entries are integers from 0 (black) to 255 (white). To calculate the number of completely white pixels, use
sum(M(:) == 255)
If you accept very light gray as white as well, use
sum(M(:) > t)
where t sets the white tolerance. For example, using t = 128 would count all pixels who is brighter than 50% gray as being white.

更多回答（1 个）

Image Analyst
Image Analyst 2013-2-24
编辑：Image Analyst 2013-2-24

0 个投票

See my image segmentation tutorial "BlobsDemo": http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 It will work for you.
Of course if you just want to count the white pixels, you can sum them like Jeppe said. But if you want measurements, like a count of the number of cars, their sizes, etc. then you'll have to use regionprops().

类别

在 帮助中心 和 File Exchange 中查找有关 Region and Image Properties 的更多信息

产品

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by