Image contrast when using labeloverlay

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Matt K.
Matt K. 2022-3-7
评论： DGM 2022-3-10
Hi,
I have setup an image datastore and a pixel label datastore for some semantic image segmentation I'd like to do and I used some code in an example to show some overlays from some images within my image/pixel lists:
for i=81:85
im=readimage(imds,i);
C=readimage(pxds,i);
B=labeloverlay(im,C,'transparency',0.5);
figure,imshow(B);
end
However, when I do this, I find that the display range for the image is too wide:
Is there a way to change display range of the background image? It's an int16 image with a [min max] range of [0 4741]
Thanks for your help,
Matt

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采纳的回答

DGM
DGM 2022-3-7
编辑：DGM 2022-3-7
Try putting your images on a common scale.
im = mat2gray(im);
C = mat2gray(C);
This will put both images in the range [0 1].
  2 个评论
Matt K.
Matt K. 2022-3-10
Thanks! That did the trick.
I see that the image was rescaled to [0,1], but I'm not sure how this worked as C is a categorical matrix (?)
In any case, it now looks the way that it should look:
(a different slice than in the original question)
DGM
DGM 2022-3-10
I ... really don't know what to say about the categorical array part. I almost never use categoricals for anything, and I never use datastore stuff so I'm not sure what to expect. At least it seems to be working.

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