Converting the code with repeated instructions to a simpler code

2020 6 25
1 个回答
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更新时间：2020 6 25
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This code is not simple as there are many repeated instructions and the difference is the value of the quality, so I want the same code, but it is simpler without repetition. How can i do this by "for loop"
and How can i use plot Here ?
figure
q=[0 5 15 25 50 75 90 100]
Original=imread('lena (1).jpg');
information = imfinfo('lena (1).jpg');
OriginalFileSize=(information.Width*information.Height*information.BitDepth)/8
%%for Quality 1
imwrite(Original,'CompressedQuality1.jpg','jpg','Quality',0) ;
information = imfinfo('CompressedQuality1.jpg');
CompressedFileSize1=information.FileSize;
CompressedRatio1=OriginalFileSize/CompressedFileSize1
%%for Quality 5
imwrite(Original,'CompressedQuality2.jpg','jpg','Quality',5);
information = imfinfo('CompressedQuality2.jpg');
CompressedFileSize2=information.FileSize;
CompressedRatio2=OriginalFileSize/CompressedFileSize2
%%for Quality 15
imwrite(Original,'CompressedQuality3.jpg','jpg','Quality',15);
information = imfinfo('CompressedQuality3.jpg');
CompressedFileSize3=information.FileSize;
CompressedRatio3=OriginalFileSize/CompressedFileSize3
%%for Qualoty 25
imwrite(Original,'CompressedQuality4.jpg','jpg','Quality',25);
information = imfinfo('CompressedQuality4.jpg');
CompressedFileSize4=information.FileSize;
CompressedRatio4=OriginalFileSize/CompressedFileSize4
%%for Quality 50
imwrite(Original,'CompressedQuality5.jpg','jpg','Quality',50);
information = imfinfo('CompressedQuality5.jpg');
CompressedFileSize5=information.FileSize;
CompressedRatio5=OriginalFileSize/CompressedFileSize5
%%for Quality 75
imwrite(Original,'CompressedQuality6.jpg','jpg','Quality',75);
information = imfinfo('CompressedQuality6.jpg');
CompressedFileSize6=information.FileSize;
CompressedRatio6=OriginalFileSize/CompressedFileSize6
%%for Quality 90
imwrite(Original,'CompressedQuality7.jpg','jpg','Quality',90);
information = imfinfo('CompressedQuality7.jpg');
CompressedFileSize7=information.FileSize;
CompressedRatio7=OriginalFileSize/CompressedFileSize7
%%for Quality 100
imwrite(Original,'CompressedQuality8.jpg','jpg','Quality',100);
information = imfinfo('CompressedQuality8.jpg');
CompressedFileSize8=information.FileSize;
CompressedRatio8=OriginalFileSize/CompressedFileSize8

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Walter Roberson
Walter Roberson 2020-6-25

1 个投票

Qualities = [0 5 15 25 50 75 90 100];
for qidx = 1 : length(Qualities)
filename = sprintf('CompressedQuality%d.jpg', qidx);
imwrite(Original, filename, 'jpg', 'Quality', Qualities(qidx));
information = imfinfo(filename);
CompressedFileSizes(qidx) = information.FileSize;
CompressedRatios(qidx) = OriginalFIleSize / CompressedFileSizes(qidx);
end

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