how to know the number of regions of the image?

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As Bdg 2017-7-17

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评论： As Bdg 2017-7-31

Hi! I have a color segmented image. i need to know the number of regions of the image , and the size of each region. Can anyone help me please?

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Ahmad Moniri 2017-7-17

Can you give an example image?

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Guillaume 2017-7-17

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编辑：Guillaume 2017-7-17

You use regionprops on your segmented image. The number of elements in the structure array it returns is the number of regions. The Area field or the BoundingBox field of the structure gives you the size, depending on what you call size.

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Guillaume 2017-7-17

编辑：Guillaume 2017-7-17

I'm not sure what an inverse wavelet transform of a labeled image gives you. If it's still a label image then you can use regionprops on it. If it's not, then you need to segment it again using an appropriate method, possibly another watershed.

I don't really understand why you'd want to apply an inverse wavelet transform to the result of a watershed segmentation.

As Bdg 2017-7-26

I'm using multiresolution approach for image segmentation. i constructed the pyramid using the wavelet transform , i segmented the image using watershed at a lower resolution, but now i need to go back to my original image . that's why i need to apply an inverse wavelet transform . And after applying it i have to merge the regions and refine regions borders, so i need to define the regions after the inverse wavelet transform. If i'll use another watershed, the image will be more over-segmented , however my goal is to avoid this over-segmentation and minimise the number of regions.

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