Problem when using for-each loops for Image Segmentation

Hi everyone

this following code is working good

clear
close all
v = VideoReader(fullfile('videos', 'combineSilver.mp4'));
s = VideoReader(fullfile('videos','scene.mp4'));

video=zeros(v.Height,v.Width,3,floor(v.Duration/(1/v.FrameRate))-2,'uint8');
t=1;%*
threshold = 0.6 ;
values=[0;1;0];
while hasFrame(v)
    Img = im2double(readFrame(v));
    mask = sqrt((values(1)-Img(:, :, 1)).^2+(values(2)-Img(:, :, 2)).^2+(values(3)-Img(:, :, 3)).^2)<threshold;
    video(:,:,:,t) = imoverlay(im2uint8(Img),mask,[0 0 0]);
    imshow(video(:,:,:,t));
    t=t+1;%*
end

videoOut = VideoWriter('result.mp4','MPEG-4');
videoOut.FrameRate=v.FrameRate;
open(videoOut);
moveX=0;
for t=1:1:size(video,4)
    im = video(:,:,:,t);
    mask = im(:,:,1)+im(:,:,2)+im(:,:,3)==0;
    frame=imoverlay(readFrame(s),~mask,[0 0 0]);
    frame=frame+im;
    writeVideo(videoOut,frame);
    imshow(frame);
end
close(videoOut);

and my task is replace below rows with 2 for-loops

mask = sqrt((values(1)-Img(:, :, 1)).^2+(values(2)-Img(:, :, 2)).^2+(values(3)-Img(:, :, 3)).^2)<threshold;
video(:,:,:,t) = imoverlay(im2uint8(Img),mask,[0 0 0]);

Here is my new code with 2 for-loops

clear
close all
v = VideoReader(fullfile('videos', 'combineSilver.mp4'));
s = VideoReader(fullfile('videos','scene.mp4'));

video=zeros(v.Height,v.Width,3,floor(v.Duration/(1/v.FrameRate))-2,'uint8');
t=1;%*
threshold = 0.69 ;
values=[0;1;0];
while hasFrame(v)
    Img = im2double(readFrame(v));
    for i=1:1:size(Img,1)
        for j=1:1:size(Img,2)
    if(sqrt((values(1)-Img(i,j,1)).^2+(values(2)-Img(i,j,2)).^2+(values(3)-Img(i,j,3)).^2)<threshold)
        mask=1;
    else
        mask=0;
    end
    video(i,j,:,t) = imoverlay(im2uint8(Img),mask,[0 0 0]);
        end
    end
    imshow(video(:,:,:,t));
    t=t+1;%*
end

videoOut = VideoWriter('result.mp4','MPEG-4');
videoOut.FrameRate=v.FrameRate;
open(videoOut);
moveX=0;
for t=1:1:size(video,4)
    im = video(:,:,:,t);
    mask = im(:,:,1)+im(:,:,2)+im(:,:,3)==0;
    frame=imoverlay(readFrame(s),~mask,[0 0 0]);
    frame=frame+im;
    writeVideo(videoOut,frame);
    imshow(frame);
end
close(videoOut);

but there are errors

Error using imoverlay (line 43)
A and BW must have the same number of rows and columns.

Error in forBackgroundRemoval (line 19)
    video(i,j,:,t) = imoverlay(im2uint8(Img),mask,[0 0 0]);

Could you please see my code and give me some hints ?

Thanks for any helps

Answer 1

[KALYAN ACHARJYA]

video(i,j,:,t) = imoverlay(im2uint8(Img),mask,[0 0 0]);

The error are self explaining, im2uint8(Img) and mask must have same sizes to avoid that error, please check it carefully

Answer 2

[ken1102]

Hi

i have already corrected my code

while hasFrame(v)
    Img = im2double(readFrame(v));
    tic
    for i=1:1:size(Img,1)
        for j=1:1:size(Img,2)
            mask(i,j)=sqrt((values(1)-Img(i,j,1)).^2+(values(2)-Img(i,j,2)).^2+(values(3)-Img(i,j,3)).^2);
    if(mask(i,j)<threshold)
        mask(i,j)=1;
    else
        mask(i,j)=0;
    end
        end
    end
toc
    video(:,:,:,t) = imoverlay(im2uint8(Img),mask,[0 0 0]);
    imshow(video(:,:,:,t));
    t=t+1;%*
end

it is working good. For expandtion, If i want also put for-loops like below, is it possible?

for i=1:1:size(Img,1)
        for j=1:1:size(Img,2)
video(:,:,:,t) = imoverlay(im2uint8(Img),mask,[0 0 0]);
        end
end