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I have a project concerning a grayscale picture

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Tiisetso
Tiisetso 2016-5-3
关闭： MATLAB Answer Bot 2021-8-20
here's the question about the attached picture:
''Consider the image below. Discuss thoroughly what is wrong with this image. Then make some plans to address these mistakes/problems''

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回答（2 个）

Walter Roberson
Walter Roberson 2016-5-4
The answer is that the mistake was in creating a JPEG lossy image. JPEG effectively does a kind of anti-aliasing that makes image analysis difficult. The cure is to go back and re-take the picture using a lossless image format.
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Tiisetso
Tiisetso 2016-5-4
Thank you But the plans to address the problem have to be in Matlab language
Walter Roberson
Walter Roberson 2016-5-4
Here then:
filename = 'twoguys.jpg';
[~,~,ext] = fileparts(filename);
if ismember(lower(ext), {'jpg', 'jpeg'})
error('Go back and retake the picture using a lossless compression like TIFF or RAW');
end
CS Researcher
CS Researcher 2016-5-4
The image has the salt and pepper noise. You can remove it using medfilt2 (Image Processing Toolbox)

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