/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/ is in psychtoolbox-3-common 3.0.11.20140816.dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/BFRenderSceneUnwrap.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/DrawRectFrame.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/NewCalibFile.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/bvlAcceptCalibGuiInput.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/bvlBarrelPincushionDots.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/bvlDrawCrosshair.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/bvlDrawText.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/bvlExpandContractDots.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/bvlSelectFitPts.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/bvlShearDots.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/bvlTranslateDots.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/bvlTrapezoidDots.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/bvlWaitForInput.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/createnewcalibrationgrid.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/fineadjust.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/fit.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/manual_calibrate.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/poly2fit.m
/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/selectcalibrationpoints.m