MATLAB: How to truncate the image values ?

truncate image values

How to truncate the image values so they stay in the [0 1] range

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Truncate, or scale? There is a difference.

% Truncate:
yourImage(yourImage >1) = 1;
% Scale (min,max) to (0,1):
yourImage = mat2gray(yourImage);
% or scale max to 1, leaving min linearly scaled (not necessarily sent to 0).
yourImage = yourImage / max(yourImage(:))

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MATLAB: To display an image

Try this:

imshow(yourImage, []); % Make sure you use the [].

It should work with everything (all 2D images): uint8,uint16, single, double, and RGB. The [] will take the min of the image and map it to 0 and the max and map it to 255 so that you will see the entire range of your image. If you don't do that, and the image is uint8 then it defaults to 0-255 and if your image is, say, all less than 5 gray levels, or a floating point image with really small values, then you won't see anything - it will be too dark.

MATLAB: How to restrict the range

I do not see why you need bsxfun for this. If X is your signal, this statement restricts X between -1 and 1

X = [0.5 1 2 -2 -1 -0.5 0]
OUT = min(max(X,-1),1)

You can create an (anonymous) function for this, if you need it a lot.

minmax = @(x,a,b) max(min(x,a),b) % restricts input X between a and b

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MATLAB: To display an image

MATLAB: How to restrict the range

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