How to write code for 3x3 sliding window to process over a Image with Pixel size of 256x256

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Sudharsan
Sudharsan 2012-9-25
I am designing a filter removing high density noises from an Gray Scale Image(256x256).
For identifying the noise pixels in the image I need a 3x3 window to slide over the image starting from the first Pixel to the Last.
If the corrupted Pixel is found i have to do some calculation to correct it.
To find this Corrupted Pixel I need a 3x3 Window to slide over my Image.
Can Anybody give me an outline on how to write Matlab code for the above.
#I have attached flow chart for my Algorithm http://i46.tinypic.com/246nm69.jpg

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回答（1 个）

Image Analyst
Image Analyst 2012-9-25
编辑：Image Analyst 2012-9-25
How about
% Blur the image with a 3x3 averaging filter.
blurredImage = conv2(grayImage, ones(3)/9, 'same');
% Get map of where "corrupted" pixels are:
binaryImage = FindCorruptedPixels(grayImage); % You write this.
% Replace corrupted pixels with averaged ones.
grayImage(binaryImage) = blurredImage(binaryImage);
Of course you need to write FindCorruptedPixels() to define what constitutes a corrupted pixels - I don't know how you define that. For example, maybe it's just pure white pixels, like
binaryImage = grayImage == 255;
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Sudharsan
Sudharsan 2012-9-25
Thanks for your reply.
I Think i didn't make my point clear. To be more precise
1. Choose the first pixel. Having it as the center pixel i have to form a 3x3 window. [Being the first pixel i've padded the Matrix with Zeros]
2. If that center Pixel is Noise Pixel it's location should be returned with all its neighborhood pixels. I will convert this 3x3 Matrix into a 1-D array and do my calculations to correct the corrupted pixels.
Here i'm struggling in designing the sliding 3x3 window to move over the image.

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