MATLAB: Choosing locations in an image to take pixels

digital image processingImage Processing Toolbox

Hello,

If I take an image and I want to do an average of the pixels across the entire image, how do I do that? Right now when I do imshow(image) then it gives me locations where I click on the image. I just want to do the entire image.

Thanks

Best Answer

meanGrayLevel = mean(grayImage(:)); % Take mean of entire image.

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MATLAB: Write a program to change brightness and change the contrast of the color image (keep the average brightness of the image). I don’t understand how to keep the average brightness of the image. thank you!!!

The way to keep the average brightness of an image is:

calculate the average brightness of the original image; Call this BRorig
make whatever local changes to color and contrast;
calculate the average brightness of the revised image; Call this BRnew
multiply the revised image by the ratio BRorig/BRnew

MATLAB: How to binarize the image and tranform into G (gray scale) and V (Value channel in the HSV colour space) channels. How to take background reference value samples by averaging the G (gray scale) and V (Value channel in the HSV colour space) channels

You can get G and V this way from the RGB image

G = rgb2gray(rgbImage);
hsvImage = rgb2hsv(rgbImage);
V = hsvImage(:, :, 3);

You can find the gray level of the 5th percentile like this:

sortedGL = sort(G(:), 'ascend');
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gl5G = sortedGL(index)
index = round(0.05 * numel(V))
gl5V = sortedGL(index)

Best Answer

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MATLAB: Write a program to change brightness and change the contrast of the color image (keep the average brightness of the image). I don’t understand how to keep the average brightness of the image. thank you!!!

MATLAB: How to binarize the image and tranform into G (gray scale) and V (Value channel in the HSV colour space) channels. How to take background reference value samples by averaging the G (gray scale) and V (Value channel in the HSV colour space) channels

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