MATLAB: I have an image of an object with plane background, how can i know background intensity value

background intensity

Best Answer

If you want to know the intensity at a particular location,

I = imread('img.bmp); % read image

intensity_val = I(20,40); % This gives you the intensity value at that point on your image

Related Solutions

MATLAB: Image Intensity

The mean of a particular pixel is just simply the pixel value, since there is only one sample - nothing really to take the mean of:

intensityValue = grayImage(100, 230); 
meanIntensityValue = mean(grayImage(100, 230));

Here, of course meanIntensityValue will equal intensityValue.

To get the mean of all the pixel values in the entire image, you can do any of these:

meanIntensityValue = mean2(grayImage);
meanIntensityValue = mean(grayImage(:));
meanIntensityValue = mean(mean(grayImage));

MATLAB: Intensity transformation

Just change this to set your desired min and max:

Let f be your array. Then . . .

originalMinValue = double(min(min(f)))
originalMaxValue = double(max(max(f)))
originalRange = originalMaxValue - originalMinValue;
% Get a double image in the range -1 to +1
desiredMin = -1;
desiredMax = 1;
desiredRange = desiredMax - desiredMin;
normalized = desiredRange * (double(grayImage) -
originalMinValue) / originalRange + desiredMin;

Best Answer

Related Solutions

MATLAB: Image Intensity

MATLAB: Intensity transformation

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