How to add loop for saving multiple images into a specific folder?

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Erza Naziha 2022-6-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1738350-how-to-add-loop-for-saving-multiple-images-into-a-specific-folder

评论： Erza Naziha 2022-6-13

Hi. I've run this code. No error occur, but it save only the last cropped image in bounding box while the other cropped images are not. Fyi, in my case, an image of bounding box will produce few cropped images which I named it as 'obj'. Meanwhile 'I12' is the resize of the cropped image. Thus, where should I add the looping and what are the codes should I write for the loop? Please help me. Thanks in advance.

srcFile=dir('C:\Users\User\Documents\FYP\Matlab\cnPVG\*.bmp');
for ck=1:length(srcFile)
    filenamecn=strcat('C:\Users\User\Documents\FYP\Matlab\cnPVG\',srcFile(ck).name);
    img_src =imread(filenamecn);
    
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% Bounding box
imbwlabel=bwlabel(I8); %bwlabel works only in binary (b&w,double) image
% figure;
% % imshow(label2rgb(imbwlabel)); %this is important bcs it helps to create the bounding box 
% %in colored (uint8,unit16 etc) image and not in binary (b&w) image
%  
bboxes=regionprops(imbwlabel,'BoundingBox');
[L, n]=bwlabel(I8);
bboxes=regionprops(I8,'BoundingBox','Centroid');
%  
% figure;imshow(I10);%title('Image with Bounding box'); 
axis image off
hold on
    for k=1 : length(bboxes)
        CurrBB=bboxes(k).BoundingBox;
%         cent=cat(1,bboxes.BoundingBox);
%         plot(cent(:,1),cent(:,2),'g*')
        rectangle('Position', [CurrBB(1),CurrBB(2),CurrBB(3),CurrBB(4)], 'EdgeColor','m','LineWidth',2)
    end
hold off
%%crop and zero padding
if ~isempty(bboxes)
    for p=1:length(bboxes)
        CurrBB=bboxes(p).BoundingBox;
        obj = imcrop(I10,CurrBB);
        [m, n, l]=size(obj);
        if (m > 227 || n > 227) 
            obj=imresize(obj,[227 227]); 
        end
        I12=zeros(227,227);
        I12=uint8(I12);
        for i=1:m
            for j=1:n
                for t=1:3
                    if (m > 227 || n > 227) 
                        obj=imresize(obj,[227 227]);
                    else I12(i,j,t)=obj(i,j,t);
                    end
                end
            end
        end
            path=strcat('C:\Users\User\Documents\FYP\Matlab\bbbPVG\',srcFile(ck).name);
            imwrite(I12,path);
    end
        % figure;imshow(I12);
%         figure;imshow(obj);
    end
end

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Erza Naziha 2022-6-13

@Jeffrey Clark Okay, thanks for helping

Erza Naziha 2022-6-13

@Jan Thanks for all the explanations. I've omitted the useless part and "img_src" as you said. It does reduced the clutters. I would say it is helpful but yet to solve the saving part. Thanks!

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回答（1 个）

Image Analyst 2022-6-12

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1738350-how-to-add-loop-for-saving-multiple-images-into-a-specific-folder#answer_984060

在 MATLAB Online 中打开

Try

props = regionprops(I8, 'BoundingBox', 'Centroid');
% Extract from structure into more convenient 2-D matrices.
allXyCentroids = vertcat(props.Centroid) % N-by-2 list of all (x,y) centroid coordinates.
allBBs = vertcat(props.BoundingBox) % N-by-4 matrix of all bounding boxes.  Each row is one box.

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Image Analyst 2022-6-13

I think you didn't see the comment on the last line:

% N-by-4 matrix of all bounding boxes. Each row is one box.

So it's an N row matrix where there is one row for every one of the N boxes. The first column is the xLeft coordinate. The second column is the yTop row of the blobs. The third column is the widths of the boxes (in columns of pixels from center to center), and the fourth column is the height of the boxes (in rows or lines of pixels).

Erza Naziha 2022-6-13