image processing, (thresholding images to obtain image with the required gray values )

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Anas Saleh
Anas Saleh 2022-5-30
评论： Anas Saleh 2022-5-31
Hello every one,
I know how to display gray images with specific limits, for an example, if I want to diplay an image (I) with values from 0-150; I only do the following:
imshow (I, [0 150]);
However, now I am trying to save this image at 'A' , but I don't know how can I do that?
I tried the following
A= I<150 ;
but the answer was binary (i.e., black and white, zeros and ones) !! and I want to save gray image as what was obtained from (imshow(I, [0 150])) command in variable 'A'.

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回答（1 个）

Image Analyst
Image Analyst 2022-5-30
Try this:
A150 = uint8(double(A) * 255 / 150);
imwrite(A150, 'A150.png');
This will scale A from 0 to 433.5 but then the uint8() function clips it to 255, so that what was 150 now shows up as 255.
You can also use imadjust.
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DGM
DGM 2022-5-31
If you're trying to automatically normalize based on the image extrema, bear in mind that using imadjust() with the implicit input range syntax will be problematic unless your image is scaled correctly for its class.
Anas Saleh
Anas Saleh 2022-5-31
Thank you all,
I will try to use these methods, and if I face any problems I will tell you.
Many thanks

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