issue in converting matrix to rgb image

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PRACHI Sood
PRACHI Sood 2020-4-3
评论： PRACHI Sood 2020-5-12
I was trying to replace pixel values by their corresponding 3x3 non overlapping block. since the output matrix was of type double I converted it to uint8 type.
But when I displayed the image in the figure window it was gray instead of coloured image . I tried cat(3, gray, gray, gray) but image is still colourless.
What did I do wrong?
img= imread('C:\Users\prach\MATLAB programs\Lenna_(test_image).png');
new = blockproc(img, [10 10], fun);
new1= uint8(new);
imshow(new1)
rgbnew= cat(3, new1, new1, new1);
imshow(rgbnew)
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Walter Roberson
Walter Roberson 2020-5-11
sounds like you are using a slightly older version of MATLAB that does not permit multiple dimensions. In that case as long as the image grayscale, median(block_struct.data(:))
But if you are dealing with rgb then it gets a bit messier,
median(reshape(block_struct.data,[],1,3),1)
PRACHI Sood
PRACHI Sood 2020-5-12
@Walter Roberson
The median(block_struct.data(:)) worked perfectly. Thankyou very much.

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回答（1 个）

Image Analyst
Image Analyst 2020-5-10
You need to use imsplit() to get the individual color channels, and then process them and combine them with cat(3).
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Image Analyst
Image Analyst 2020-5-11
The blockproc_color_means.m demo gives this image. Is it like you want?
PRACHI Sood
PRACHI Sood 2020-5-12
Apologies for the incomplete information. Attaching the .m file and the image.
Yes, the output images shown in your last comment as output of blockproc_color_means.m is my desired output. I will go through the list of demos you have provided. Thankyou very much.

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