MATLAB: Subtract each pixel from average pixel value

Image Processing Toolboxpixel subtraction

i have taken mean pixel value of an image and now i have to subtract from each pixel value of the image the average pixel value…how can i do it?

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It seems deceptively simple...

Image-meanValue

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MATLAB: Get grayImage from bitImage

No. There is no way to obtain the original gray level image from a binary image that has been created by thresholding that gray scale image. If you want the gray scale image later, be sure to save your gray scale image variable.

MATLAB: How to apply a window on an image to keep the part in the window while reduce the resolution (clarity) of the remaining part of the picture

Use poly2mask() to make a mask of the part you want to preserve. Then blur the whole image with imfilter() or conv2(). Then replace the image in the mask with the original. Something like

[rows, columns, numberOfColorChannels] = size(grayImage);
mask = poly2mask(x, y, rows, columns);
kernel = ones(9,9);
kernel = kernel / sum(kernel(:)); % Normalize so we don't change the mean intensity of the image.
blurredImage = conv2(grayImage, kernel, 'same'); % Blurs everything, including the masked region.
blurredImage(mask) = grayImage(mask); % Restore original to the masked region.

x and y are the points of the vertices of your trapezoid.

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Related Solutions

MATLAB: Get grayImage from bitImage

MATLAB: How to apply a window on an image to keep the part in the window while reduce the resolution (clarity) of the remaining part of the picture

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