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How to remove large blob area using morph method??

asked 2013-03-22 12:51:19 -0500

wuling gravatar image

Hi all: Does someone have or know using morph method to remove large blob area??

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What do you actually want to accomplish? Remove the image content of a blob area? Or blur the region? Give us some more information please.

StevenPuttemans gravatar imageStevenPuttemans ( 2013-03-22 13:43:33 -0500 )edit

Dear StevenPuttemans: I want remove the image content of a blob area.it 's binary operation.

wuling gravatar imagewuling ( 2013-03-22 23:08:41 -0500 )edit

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answered 2013-03-24 16:10:20 -0500

Once you know the mask, which is actually a set of 0 - 1 values, you can just multiply each layer of your color RGB image or the grayscale layer with the binary mask, resulting in 0 values for the actual regions you remove. Its plain and simple :)

EXAMPLE

Grayscale image Mat is represented by (random values between 0 & 255). Mask is defined by a set of 0 and 1 values. Result is the image without the blob region.

1 2 3 4 5   x   0 0 0 0 0   =  0 0 0 0 0
2 3 4 5 6       0 0 0 0 0      0 0 0 0 0
3 4 5 6 7       0 1 1 1 0      0 4 5 6 0
5 6 7 8 8       0 1 1 1 0      0 6 7 8 0
1 1 1 1 1       0 0 1 0 0      0 0 1 0 0

Hope this makes it more clear. Be aware to use a dot wise (element wise) multiplication of both matrices!

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Dear StevenPuttemans: if i have a lot of blobs in a picture. This way also remove somes blobs whish is area is small.Right???

wuling gravatar imagewuling ( 2013-03-26 08:42:49 -0500 )edit

Then first edit your blob mask with dilation and erode functionality until the desired result.

StevenPuttemans gravatar imageStevenPuttemans ( 2013-03-26 09:28:53 -0500 )edit
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Asked: 2013-03-22 12:51:19 -0500

Seen: 877 times

Last updated: Mar 24 '13