bwareaopen for RGB and binary

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Tulips 2012-10-29

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https://ww2.mathworks.cn/matlabcentral/answers/52156-bwareaopen-for-rgb-and-binary

hi sir, can I know how to use bwareaopen for RGB image. after I convert the rgb image to binary, do I need to put uint8 and [] when displaying the binary images?

[Merged information from duplicate question]

hi sir, may I know how to assign the conversion of rgb to binary. for instance,, I've used this coding but the output is all black,why is that:

      %%Binary
   im=uint(im)
   figure;imshow(im,[])
   %%remove pxls less than 100
     pixels=100;
     detectObject=uint8(bwareaopen,pixels)
    figure;imahow(detectObject,[])

回答（2 个）

Image Analyst 2012-10-29

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https://ww2.mathworks.cn/matlabcentral/answers/52156-bwareaopen-for-rgb-and-binary#answer_63588

编辑：Image Analyst 2012-10-30

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That doesn't make sense. You don't use bwareaopen for RGB AND binary. You use it just for binary images.

You do not need to cast binary (logical) images to uint8 or use [] in imshow() for binary images.

Try

binaryImage = im < someThresholdValue;
detectObject = bwareaopen(binaryImage, pixels);
imshow(detectObject);

I just want to why after the conversion from rgb to binary , the used of bwrareaopen function produced all black images?I want to remove certain noise from the binary image.how can I do that , instead of using bwareaopen.thanks!

Image Analyst 2012-11-1

Are you asking us to give advice on your image without showing us your image? How successful do you think we can be in that situation?

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Walter Roberson 2012-10-29

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https://ww2.mathworks.cn/matlabcentral/answers/52156-bwareaopen-for-rgb-and-binary#answer_63590

bwareaopen() is a function call that you need to apply to your data. You are instead calling it with no parameters, so it would be returning the empty matrix.