3.3.4 GABOREXT

Syntax: GABOREXT X/Y coordinates of center stimulus angle percent contrast

The Gabor patch extension, GABOREXT, draws Gabor patches, fixation point, a box around the patch, and "pink" noise with controllable contrast.

GABOREXT requires four integers in its most basic form: X-coordinate, Y-coordiante,stimulus angle, and contrast in percentage of full-scale contrast, where all angles are measured clockwise from the vertical axis. Any integer is allowed for the angles, measured in degrees, but it is recommended that the angles be kept between 0 and 360 degrees, or between -180 and +180 degrees, for clarity.

A Cogsys variable, V93, changes the default size of the Gabor patch from the default.

Two examples follow.

In the complete testlist below, each %I command creates a Gabor patch.

%X[gaborext.cxr] %M2%C2 #W1000%A[Y100,C15,F1]#G[Press Space Bar - Sample 1]#Z[ ]#S/0,0,0/@C %C%I[1,4,999]%I[1,P1,1,160,100,348,16]%L[2,2,1]#S/9,9,9/@C #W1000%A[Y100,C15,F1]#G[Press Space Bar - Sample 2]#Z[ ]#S/9,9,9/@C %C%I[1,4,999]%I[1,P1,1,160,100,12,16]%L[2,2,1]#S/9,9,9/@C #W1000%A[Y100,C15,F1]#G[Press Space Bar - Sample 3]#Z[ ]#S/9,9,9/@C %C%I[1,4,999]%I[1,P1,1,160,100,348,8]%L[2,2,1]#S/9,9,9/@C #W1000%A[Y100,C15,F1]#G[Press Space Bar - Sample 4]#Z[ ]#S/9,9,9/@C %C%I[1,4,999]%I[1,P1,1,160,100,12,4]%L[2,2,1]#S/9,9,9/@C #G[Done - press any key to exit]

Image 1	Image 2
Image 3	Image 4

GABOREXT Implementation