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i have an array of <655368 int8> (all are binary numbers). i want to make the corresponding grayimage having size if 256 256. how can i do it.

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aditya kumar sahu 2016-11-27

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评论： Walter Roberson 2016-11-30

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i have an array of <65536*8 int8> (all are binary numbers) . i want to make the corresponding grayimage having size if 256* 256. how can i do it. kindly suggest me.

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Walter Roberson 2016-11-27

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在 MATLAB Online 中打开

as_numeric = bin2dec(char(YourArray + '0'));
YourImage = reshape(as_numeric, 256, []);

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image is not created because i have to read its pixel values.

Image Analyst 2016-11-28

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That does not make sense. You do not need to read its pixel values because you said "i have an array" so you already have the pixel values - they're in your array. They are either 0 or 1 since you said it was a binary (logical) array.

If you don't have your array yet (like you said), then where is it???

aditya kumar sahu 2016-11-28

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在 MATLAB Online 中打开

The logic is correct but i want to read the pixel values using say imread('x.jpg');but i am not finding the image format by this code.

s_numeric = bin2dec(char(YourArray + '0'));
  YourImage = reshape(as_numeric, 256, []);

here 'YourImage' does not create any image ,it just creates the double matrix.when i convert this to uint8 matrix and then to its image its pixels are changing.it should not change.. is my question is clear to you..

aditya kumar sahu 2016-11-28

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just now i seen about intensity image,it only have data matrix but i want to save the intensity matrix in jpeg format.

Image Analyst 2016-11-28

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在 MATLAB Online 中打开

Then just use imread(). It will create an image. If you don't like the shape, then use reshape

grayImage = imread('x.jpg');
grayImage = reshape(grayImage, 256, []);
imwrite(grayImage, filename);

And you should not use jpg images if you expect to do image analysis on them. Use .PNG instead.

aditya kumar sahu 2016-11-28

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Thank you very much for your patience.but my doubt is still not clear.. i have a double matrix a[256,256].i just want an image from the matrix.when i am using all the above suggestions i am getting it but some pixels of the image is not same to the original pixel..

Walter Roberson 2016-11-28

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在 MATLAB Online 中打开

as_numeric = uint8(bin2dec(char(YourArray + '0')));
YourImage = reshape(as_numeric, 256, []);

"but some pixels of the image is not same to the original pixel.."

If you wrote out to a JPEG file and did not tell imwrite to use lossless compression, then you would almost always get back a different array when you used imread(). Unless you tell JPEG otherwise it uses lossy compression -- it throws away information that it thinks you don't need. If you do need that information then you should not be using JPEG.

aditya kumar sahu 2016-11-30

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so,if we use jpeg image some loss of information will be there.is it?but what about png and bmp images.

Walter Roberson 2016-11-30

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Yes, writing to JPEG loses information unless you tell imwrite() to use lossless compression. png and bmp do not lose information.

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i have an array of <655368 int8> (all are binary numbers). i want to make the corresponding grayimage having size if 256 256. how can i do it.

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i have an array of <65536*8 int8> (all are binary numbers). i want to make the corresponding grayimage having size if 256* 256. how can i do it.

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i have an array of <655368 int8> (all are binary numbers). i want to make the corresponding grayimage having size if 256 256. how can i do it.

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显示 -2更早的评论隐藏 -2更早的评论

9 个评论
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