Remove small chunks of labels in an image

问题:

I am new in MATLAB also in image processing, I am trying to locate a person frame by frame. so far I have labeled the cropped image (cropped using PeopleDetector) like this, now if I locate exact location of person like i.e. at which pixel location '1' start and end (I know this is not right logic).

All I want is to remove little chunks of white pixels at the right side of the person. I dont know how to do that. please suggest me.

回答1:

You can use bwareaopen:

bwareaopen(A, P)

This removes all objects that have fewer than P pixels from binary image A.

回答2:

use regionprops

>> props = regionprops( bwlabel( mask, 4 ), 'Area', 'PixelIdxList' );
>> smallRegions = [props(:).Area] < minNumPixels; % select the small regions
>> mask( [props( smallRegions ).PixelIdxList ] ) = 0; % reset small regions