如何更改Dicom图像的灰度？

Question

I am working gray images in which gray level lies 0 to 255 . I want to work on Dicom images but maximum gray level of dicom image is grater than 255. I just want to know that how to change dicom image with maximum gray level 255.

Thanks in advance.

Answer 1

You can normalize the images so that they have a range of [0,1] . Once you do this, you can scale the image by 255 to bring this to a range of [0,255] . Assuming your image is stored in im , you can do this:

im = double(im);
im = (im - min(im(:))) / (max(im(:)) - min(im(:))); %// Normalize to 0-1
im = uint8(255*im); %// Scale to 255

min(im(:)) will find the minimum intensity of your entire image while max(im(:)) will find the maximum intensity of your entire image. Note that once I scale the image, I cast to uint8 as this will the proper data type associated with this intensity range.

However, MATLAB has functionality that already normalizes between [0,1] with im2double . This takes in an image of any precision and normalizes the image to [0,1] . You can then take this output, multiply by 255 and cast to uint8 :

im = uint8(255*im2double(im));