bwareaopen for RGB and binary
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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
编辑：Image Analyst
2012-10-30
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);
5 个评论
Image Analyst
2012-10-30
You CAN use it on a binary image. If an RGB image has been processed such that you produce a binary image, and you pass the binary image into bwareaopen(), then you aren't really using it on an RGB image, are you? You're using it on a binary image, not an RGB image.
What does the debugger say when you hover over im when you stop there are a breakpoint?
Walter Roberson
2012-10-30
Please show your actual coding. The code you posted in the Question would not have gotten that far as there is no routine named "uint".
Tulips
2012-11-1
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?
Walter Roberson
2012-10-29
0 个投票
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.
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