How to find area of specific region in binary image ?
6 次查看(过去 30 天)
显示 更早的评论
For example, I have image with
- region1 white,
- region2 black,
- region3 white,
- region4 black and
- region5 white.
How can I know pixel density in region4 and how to convert that specific area mm2/cm2 ?
2 个评论
Image Analyst
2020-11-29
What do you mean by pixel density? All regions of the image have the same density (pixels per unit area). Or do you mean "optical density", in other words, intensity of a gray scale image in region 4?
回答(1 个)
Image Analyst
2020-11-30
编辑:Image Analyst
2020-11-30
See my Image Segmentation Tutorial in my File Exchange:
In short, segment your image by thresholding or whatever to get a mask, then do
props = regionprops(mask, grayImage, 'Area', 'MeanIntensity');
for k = 1 : numel(props)
fprintf('Blob #%d has an area of %d pixels (%.2f sq. cm), and mean intensity of %.2f\n', ...
k, props(k).Area, props(k).Area * cmPerPixel^2, props(k).MeanIntensity);
end
To see how to determine the number of pixels per cm, see my attached spatial calibration demo.
6 个评论
Image Analyst
2020-12-1
areaOfBlob3 = allAreas(3);
I think that's SO obvious that I'm not sure it's what you mean, so try to explain better.
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Image Processing Toolbox 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!