Gabor patches in matlab

Question

Stephen Pierzchajlo 2017-5-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/342539-gabor-patches-in-matlab

编辑： Kushagr Gupta 2017-6-8

Hi all. My lab is interested in using gabor patches in a new study and I have found some code online for creating them. However, I do not typically use matlab or code much and have run into a bit of a problem. The code creates a gabor patch on a grey background and allows you to easily adjust contrast, angle of display, etc. The problem is that I want to view the gabor patch as an image (using imagesc for instance) so that I can save the image and use it in eprime. Unfortunately, the code opens the image as a program so that it is displayed in full screen and requires me to press a key to get out. Could someone look at the code and give me some tips as to what I might do to change it so that the gabor opens in imagesc or some other image viewer? Thanks.

if true
% Setup PTB with some default values
PsychDefaultSetup(2);
% Set the screen number to the external secondary monitor if there is one
% connected
screenNumber = max(Screen('Screens'));
% Define black, white and grey
white = WhiteIndex(screenNumber);
grey = white / 2;
% Skip sync tests for demo purposes only
Screen('Preference', 'SkipSyncTests', 2);
% Open the screen
[window, windowRect] = PsychImaging('OpenWindow', screenNumber, grey, [], 32, 2,...
  [], [],  kPsychNeed32BPCFloat);
% Dimension of the region where will draw the Gabor in pixels
gaborDimPix = windowRect(4) / 2;
% Sigma of Gaussian
sigma = gaborDimPix / 7;
% Obvious Parameters
orientation = 0;
contrast = 0.8;
aspectRatio = 1.0;
phase = 0;
% Spatial Frequency (Cycles Per Pixel)
% One Cycle = Grey-Black-Grey-White-Grey i.e. One Black and One White Lobe
numCycles = 5;
freq = numCycles / gaborDimPix;
% Build a procedural gabor texture (Note: to get a "standard" Gabor patch
% we set a grey background offset, disable normalisation, and set a
% pre-contrast multiplier of 0.5.
backgroundOffset = [0.5 0.5 0.5 0.0];
disableNorm = 1;
preContrastMultiplier = 0.5;
gabortex = CreateProceduralGabor(window, gaborDimPix, gaborDimPix, [],...
  backgroundOffset, disableNorm, preContrastMultiplier);
% Randomise the phase of the Gabors and make a properties matrix.
propertiesMat = [phase, freq, sigma, contrast, aspectRatio, 0, 0, 0];
% Draw the Gabor. By default PTB will draw this in the center of the screen
% for us.
Screen('DrawTextures', window, gabortex, [], [], orientation, [], [], [], [],...
  kPsychDontDoRotation, propertiesMat');
% Flip to the screen
Screen('Flip', window);
% Wait for a button press to exit
KbWait;
% Clear screen
sca;
end

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Answer 1

Kushagr Gupta 2017-6-8

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/342539-gabor-patches-in-matlab#answer_270061

编辑：Kushagr Gupta 2017-6-8

The code shared here is not complete and does not include the implementation of the 'screen' function which is not a MATLAB inbuilt function. That function is responsible for displaying the gabor patch on entire screen and you can modify its definition to suit your requirement.

That being said, I believe, the variable "gabortex" is what you are interested in and you can pass that to imagesc and save it in a MAT file.