Delete certain pixels in 3D matrix

Question

Oded Scharf 2018-8-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/414554-delete-certain-pixels-in-3d-matrix

回答： Oded Scharf 2019-7-15

采纳的回答： Oded Scharf

bin_angiogram.mat

在 MATLAB Online 中打开

Hey, I need to clean a video by deleting specific pixels in each frame using 'regionprops'.

When I use 'PixelList' in the indexing it deletes whole squares and not the specific pixels:

for frame=1:size(bin_angiogram,3)
    region_angiogram(:,:,frame)=bwlabel(bin_angiogram(:,:,frame)); 
    stats=regionprops(region_angiogram(:,:,frame),'Area','PixelIdxList');
    for region=1:size(stats,1)
        if stats(region).Area<3000
             region_angiogram(stats(region).PixelList(:,2),stats(region).PixelList(:,1),frame) =0;
        end
    end
end

and if I try to do it using 'PixelIdxList' it is extremely slow:

for frame=1:size(bin_angiogram,3)
    region_angiogram(:,:,frame)=bwlabel(bin_angiogram(:,:,frame)); 
    stats=regionprops(region_angiogram(:,:,frame),'Area','PixelList');
    for region=1:size(stats,1)
        if stats(region).Area<500
             L = region_angiogram(:,:,frame);
             L(stats(region).PixelIdxList) = 0;
             region_angiogram(stats(region).PixelList,frame) =L;
        end
    end
end