How can I generate Gabor patterns with specified contrasts and save them as pictures?

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G GK
G GK 2015-12-22
回答： Sreeram 2025-1-21
I need to create pictures with a specific Gabor pattern, with different levels of contrast - from 0% to 100%.
I know there is a "Gabor" function in Matlab, but I did not find a way to define the Gabor's contrast.
I know there is also a PsychToolbox function that creates a Gabor texture on the screen (Screen('DrawTexture', windowPtr, gaborid...), but I do not need to present the Gabors on screen, I need to save bitmap pictures, and I do not know how to capture pictures presented on a running PsychToolbox screen (so a function\code that captures the screen and saves it would be appreciated as well).
Thank you! Genie

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回答（1 个）

Sreeram
Sreeram 2025-1-21
Ran in:
Hi Genie,
To create Gabor patterns with different contrast levels in MATLAB, you can use the "imadjust" function to modify the contrast of the generated image. Here is how this may be done:
g = gabor(20, 30);
gaborPattern = real(g.SpatialKernel);
% Example for 35% contrast
contrastLevel = 0.35;
adjustedPattern = imadjust(gaborPattern, [0, 1], [0.5 - contrastLevel/2, 0.5 + contrastLevel/2]);
imshow(adjustedPattern)
% Example for 100% contrast
contrastLevel = 1;
adjustedPattern = imadjust(gaborPattern, [0, 1], [0.5 - contrastLevel/2, 0.5 + contrastLevel/2]);
imshow(adjustedPattern)
The "imadjust" function adjusts the contrast by remapping the intensity values of an image. More information on the function is available in the following documentation:
https://www.mathworks.com/help/images/ref/imadjust.html
The image may be saved using the "imwrite" function:
https://www.mathworks.com/help/matlab/ref/imwrite.html
I hope this helps!

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