Code takes too much time to compile. Maybe some advice?

Question

Pavel Chatterjee 2018-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/389852-code-takes-too-much-time-to-compile-maybe-some-advice

评论： Pavel Chatterjee 2018-3-22

My Matlab code is taking too much time to compile. It basically has a lot of iterations. The real work of the code is to individually get rgb values(For a specific row and col of the picture matrix) using some logic and then creating a fresh new rgb matrix and finally converting the rgb matrix into an image. Maybe I would need some advice on making the compilation time quicker. Your help will be much appreciated. Also I tried to put a waitbar, bu the waitbar doesnt show any progress at all.

My Code h = waitbar(0,'Please wait...'); for i=1:1000 numberOfImages=2;

k=0;

for row=1:1584 for col=1:2780

                for i=1:numberOfImages
                    filename=[num2str(i), '.png'];
                    rgbImage=imread(filename, 'png');                      
                    R = rgbImage(row, col, 1);
                    G = rgbImage(row, col, 2);
                    B = rgbImage(row, col, 3);
                    RGBMatrix(i,:) =[R,G,B];
                end
                    for imageNumber=1:numberOfImages
                        match=0;
                        jitter=0;
                        for j=numberOfImages:-1:1   
                                RedChannelDifference=abs(double(RGBMatrix(j,1))-double(RGBMatrix(imageNumber,1)));
                                GreenChannelDifference=abs(double(RGBMatrix(j,2))-double(RGBMatrix(imageNumber,2)));
                                BlueChannelDifference=abs(double(RGBMatrix(j,3))-double(RGBMatrix(imageNumber,3)));
                                    if (RedChannelDifference+GreenChannelDifference+BlueChannelDifference)<=10
                                                jitter=jitter+RedChannelDifference+GreenChannelDifference+BlueChannelDifference;
                                                match=match+1;
                                    end
                        end
                        match=match-1;
                        matchMatrixOfAllImages(imageNumber,:)=[match];
                    end
                    %fprintf('The maximum value of matches is : %d \n', max(matchMatrixOfAllImages(:)));
                    index=find(matchMatrixOfAllImages == max(matchMatrixOfAllImages(:)));
                     if size(index,1)>1
                         jitterMatrixOfAllImages(imageNumber,:)=[jitter];  
                        % fprintf('Jitter values of ONLY MATCHES');
                         jitterMatrixOfMatchedImages=jitterMatrixOfAllImages(index,:);
                         indexForJitter=find(jitterMatrixOfMatchedImages == min(jitterMatrixOfMatchedImages(:)));
                            if size(indexForJitter,1)>1
                                indexOfPictureNeeded=indexForJitter(1,:);
                                filenameOfImage1=[num2str(indexOfPictureNeeded), '.png'];
                                rgbImage1=imread(filename, 'png');         
                                R1 = rgbImage1(row, col, 1);
                                G1 = rgbImage1(row, col, 2);
                                B1 = rgbImage1(row, col, 3);
                                RGBMatrix1(indexOfPictureNeeded,:) =[R1,G1,B1];
                                k=k+1;
                                out(k,:) =RGBMatrix1 ;
                            else
                               indexOfPictureNeeded=indexForJitter(1,:);
                                filenameOfImage1=[num2str(indexOfPictureNeeded), '.png'];
                                rgbImage1=imread(filename, 'png');         
                                R1 = rgbImage1(row, col, 1);
                                G1 = rgbImage1(row, col, 2);
                                B1 = rgbImage1(row, col, 3);
                                RGBMatrix1(indexOfPictureNeeded,:) =[R1,G1,B1]; 
                                k=k+1;
                                out(k,:) =RGBMatrix1 ;
                            end
                     else
                                jitterMatrixOfAllImages(imageNumber,:)=[jitter];  
                                jitterMatrixOfMatchedImages=jitterMatrixOfAllImages(index,:);
                                indexForJitter=find(jitterMatrixOfMatchedImages == min(jitterMatrixOfMatchedImages(:)));
                                indexOfPictureNeeded1=indexForJitter(1,:);  
                                filename1=[num2str(indexOfPictureNeeded1), '.png'];
                               rgbImage2=imread(filename, 'png');                      
                                R1 = rgbImage2(row, col, 1);
                                G1 = rgbImage2(row, col, 2);
                                B1 = rgbImage2(row, col, 3);
                                RGBMatrix2(indexOfPictureNeeded1,:) =[R1,G1,B1];
                                k=k+1;
                                 out(k,:) =RGBMatrix2 ;
                    end
    end

end imshow(imagesc(out)); waitbar(i/1000,h) end

4 个评论
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KSSV 2018-3-22

It is not a good practice to copy and run the code. Copy it in a editor, save it with .m extension and run the code through this file.

Pavel Chatterjee 2018-3-22

Thank you. But any advice on how to run this. I have not been able to get an output image. But However, if i do it at a particular row and col i do get my results. Now when i loop it doesnt work

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