# Display Undistortion : problems loading config file **URL:** \ **Category:** Uncategorized\ **Created:** [December 17, 2011, 5:30pm UTC](https://psychtoolbox.discourse.group/t/display-undistortion-problems-loading-config-file/1773 "2011-12-17T17:30:39Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\ **Post date:** [December 17, 2011, 5:30pm UTC](https://psychtoolbox.discourse.group/t/display-undistortion-problems-loading-config-file/1773/1 "2011-12-17T17:30:39Z")
Hi everyone I use the Psychtoolbox to display some stimuli with a projector, on a curbed screen. I need correct the (multiple) distortion of the image. I used "DisplayUndistortionBVL" to generate the "undistortion config file". The file generation is ok. Now.. I load the file as indicated, but when I draw sometings, the distortion is not corrected (I have no changes! I have no error notification) Could someone help me, please ..? Thanks in advance - - - Here the code: %% Screen dimension ScreenXpix = 1024 ; ScreenYpix = 768 ; centroschermo = [(ScreenXpix/2) (ScreenYpix/2)] ; %% --------------- PARAMETERS and initialization ----------------% flipSpdwindow = 0; whichScreen = 1; % working window ---------- rcD = 1; % duration of the Red Cross Fixation presentation [sec] data = []; %% --------------------- COLORS -------------------------% white = [255 255 255]; gray = [128 128 128]; Dgray = [54 54 54]; black = [0 0 0]; blue = [100 100 250]; red = [200 50 50]; green = [21 152 18]; %% --------------------- Open Working Window ---------------------% % on line window rec = Screen('Rect',whichScreen); % Screen selection [W, H]=Screen('WindowSize', whichScreen); %%% [window, rect] = Screen('OpenWindow', whichScreen, black, rec); PsychImaging('PrepareConfiguration'); PsychImaging('AddTask', 'AllView', 'GeometryCorrection', 'C:\Documents and Settings\acarlini\Application Data\Psychtoolbox\GeometryCalibration\BVLCalibdata\_1\_1280\_1024.mat', 0, 73 , 53) ; [window , rect] = PsychImaging('OpenWindow', whichScreen, black, rec); monitorFlipInterval = Screen('GetFlipInterval', window); % Screen center centroschermo = (rec (3:4) ) /2 ; %% Draws Window corners - to test the correction % Up Left Screen('FillRect',window, blue , [0 , 0 , 50 , 50] ) ; Screen('FillRect',window, black , [10 , 10 , 50 , 50] ) ; % Up Right Screen('FillRect',window, blue , [rect(3)-50 , 0 , rect(3) , 50] ) ; Screen('FillRect',window, black , [rect(3)-50 , 10 , rect(3)-10 , 50] ) ; % Down Left Screen('FillRect',window, blue , [0 , rect(4)-50 , 50 , rect(4)] ) ; Screen('FillRect',window, black , [10 , rect(4)-50 , 50 , rect(4)-10] ) ; % Down Right Screen('FillRect',window, blue , [rect(3)-50 , rect(4)-50 , rect(3) , rect(4)] ) ; Screen('FillRect',window, black , [rect(3)-50 , rect(4)-50 , rect(3)-10 , rect(4)-10] ) ; % Up Screen('FillRect',window, blue , [(round(rect(3)/2)-25) , 0 , (round(rect(3)/2)+25) , 10] ) ; Screen('FillRect',window, white , [(round(rect(3)/2)-2) , 0 , (round(rect(3)/2)+2) , 10] ) ; % Down Screen('FillRect',window, blue , [(round(rect(3)/2)-25) , rect(4)-10 , (round(rect(3)/2)+25) , rect(4)] ) ; Screen('FillRect',window, white , [(round(rect(3)/2)-2) , rect(4)-10 , (round(rect(3)/2)+2) , rect(4)] ) ; % Left Screen('FillRect',window, blue , [0 , (round(rect(4)/2)-25) , 10 , (round(rect(4)/2)+25)] ) ; % Right Screen('FillRect',window, blue , [rect(3)-10 , (round(rect(4)/2)-25) , rect(3) , (round(rect(4)/2)+25)] ) ; % Center dim\_cross = 8 ; % Cross dimension, in pixel spex\_cross = 3 ; % Cross'line dimension, in pixel Screen('DrawLine', window , red , centroschermo(1) - dim\_cross , centroschermo(2) - dim\_cross , centroschermo(1) + dim\_cross , centroschermo(2) + dim\_cross , spex\_cross ) ; Screen('DrawLine', window , red , centroschermo(1) + dim\_cross , centroschermo(2) - dim\_cross , centroschermo(1) - dim\_cross , centroschermo(2) + dim\_cross , spex\_cross ) ; Screen('Flip', window); %% Mouse clilck pmb = 0 ; while pmb == 0 [Xmouse,Ymouse,buttons] = GetMouse() ; if any(buttons) fprintf('Someone''s pressing a mouse button!\n'); MouseClick = [clock,buttons,Xmouse,Ymouse] ; pmb = 1 ; end end %% -------------- Close PSICHTOOLBOX Working Window ----------% Screen('CloseAll'); ---
**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\ **Post date:** [December 19, 2011, 11:59am UTC](https://psychtoolbox.discourse.group/t/display-undistortion-problems-loading-config-file/1773/2 "2011-12-19T11:59:21Z")
Thank you for the solution, now it is working ! Now I have a good display… but I find a miscorrelation between the "corrected" display and the mouse click (when I get the click position with GetMouse() or GetClicks() ). I have the impression that the mouse click follows the original grid, not the corrected-one. Do you know if it is available a function or a system to solve this problem ? Thanks in advance ! --------------------------------------------------------------- > --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "Mario" \ wrote: > \> > \> Simple: > \> > \> PsychImaging('AddTask', 'AllView', 'GeometryCorrection', 'C:\Documents and > \> Settings\acarlini\Application > \> Data\Psychtoolbox\GeometryCalibration\BVLCalibdata\_1\_1280\_1024.mat', 0, 73 , 53) > \> ; > \> > \> --\> 'AllViews', not 'AllView'. The parser silently ignores that 'AddTask' statement with unknown keyword. > \> > \> Btw. \<[http://docs.psychtoolbox.org/GetClicks](http://docs.psychtoolbox.org/GetClicks)\> may come handy for waiting for mouse clicks. > \> > \> -mario > \> > \> --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "c\_drago" \ wrote: > \> \> > \> \> Hi everyone > \> \> > \> \> I use the Psychtoolbox to display some stimuli with a projector, on a curbed screen. > \> \> > \> \> I need correct the (multiple) distortion of the image. I used "DisplayUndistortionBVL" to generate the "undistortion config file". The file generation is ok. > \> \> > \> \> Now.. I load the file as indicated, but when I draw sometings, the distortion is not corrected (I have no changes! I have no error notification) > \> \> > \> \> Could someone help me, please ..? > \> \> > \> \> Thanks in advance > \> \> > \> \> - - - > \> \> > \> \> Here the code: > \> \> > \> \> %% Screen dimension > \> \> ScreenXpix = 1024 ; > \> \> ScreenYpix = 768 ; > \> \> centroschermo = [(ScreenXpix/2) (ScreenYpix/2)] ; > \> \> %% --------------- PARAMETERS and initialization ----------------% > \> \> flipSpdwindow = 0; > \> \> whichScreen = 1; % working window ---------- > \> \> rcD = 1; % duration of the Red Cross Fixation presentation [sec] > \> \> data = []; > \> \> %% --------------------- COLORS -------------------------% > \> \> white = [255 255 255]; > \> \> gray = [128 128 128]; > \> \> Dgray = [54 54 54]; > \> \> black = [0 0 0]; > \> \> blue = [100 100 250]; > \> \> red = [200 50 50]; > \> \> green = [21 152 18]; > \> \> %% --------------------- Open Working Window ---------------------% > \> \> % on line window > \> \> rec = Screen('Rect',whichScreen); % Screen selection > \> \> > \> \> [W, H]=Screen('WindowSize', whichScreen); > \> \> > \> \> %%% [window, rect] = Screen('OpenWindow', whichScreen, black, rec); > \> \> > \> \> PsychImaging('PrepareConfiguration'); > \> \> > \> \> PsychImaging('AddTask', 'AllView', 'GeometryCorrection', 'C:\Documents and Settings\acarlini\Application Data\Psychtoolbox\GeometryCalibration\BVLCalibdata\_1\_1280\_1024.mat', 0, 73 , 53) ; > \> \> > \> \> [window , rect] = PsychImaging('OpenWindow', whichScreen, black, rec); > \> \> > \> \> monitorFlipInterval = Screen('GetFlipInterval', window); > \> \> > \> \> % Screen center > \> \> centroschermo = (rec (3:4) ) /2 ; > \> \> > \> \> > \> \> %% Draws Window corners - to test the correction > \> \> % Up Left > \> \> Screen('FillRect',window, blue , [0 , 0 , 50 , 50] ) ; > \> \> Screen('FillRect',window, black , [10 , 10 , 50 , 50] ) ; > \> \> % Up Right > \> \> Screen('FillRect',window, blue , [rect(3)-50 , 0 , rect(3) , 50] ) ; > \> \> Screen('FillRect',window, black , [rect(3)-50 , 10 , rect(3)-10 , 50] ) ; > \> \> % Down Left > \> \> Screen('FillRect',window, blue , [0 , rect(4)-50 , 50 , rect(4)] ) ; > \> \> Screen('FillRect',window, black , [10 , rect(4)-50 , 50 , rect(4)-10] ) ; > \> \> % Down Right > \> \> Screen('FillRect',window, blue , [rect(3)-50 , rect(4)-50 , rect(3) , rect(4)] ) ; > \> \> Screen('FillRect',window, black , [rect(3)-50 , rect(4)-50 , rect(3)-10 , rect(4)-10] ) ; > \> \> % Up > \> \> Screen('FillRect',window, blue , [(round(rect(3)/2)-25) , 0 , (round(rect(3)/2)+25) , 10] ) ; > \> \> Screen('FillRect',window, white , [(round(rect(3)/2)-2) , 0 , (round(rect(3)/2)+2) , 10] ) ; > \> \> % Down > \> \> Screen('FillRect',window, blue , [(round(rect(3)/2)-25) , rect(4)-10 , (round(rect(3)/2)+25) , rect(4)] ) ; > \> \> Screen('FillRect',window, white , [(round(rect(3)/2)-2) , rect(4)-10 , (round(rect(3)/2)+2) , rect(4)] ) ; > \> \> % Left > \> \> Screen('FillRect',window, blue , [0 , (round(rect(4)/2)-25) , 10 , (round(rect(4)/2)+25)] ) ; > \> \> % Right > \> \> Screen('FillRect',window, blue , [rect(3)-10 , (round(rect(4)/2)-25) , rect(3) , (round(rect(4)/2)+25)] ) ; > \> \> % Center > \> \> dim\_cross = 8 ; % Cross dimension, in pixel > \> \> spex\_cross = 3 ; % Cross'line dimension, in pixel > \> \> Screen('DrawLine', window , red , centroschermo(1) - dim\_cross , centroschermo(2) - dim\_cross , centroschermo(1) + dim\_cross , centroschermo(2) + dim\_cross , spex\_cross ) ; > \> \> Screen('DrawLine', window , red , centroschermo(1) + dim\_cross , centroschermo(2) - dim\_cross , centroschermo(1) - dim\_cross , centroschermo(2) + dim\_cross , spex\_cross ) ; > \> \> > \> \> Screen('Flip', window); > \> \> > \> \> %% Mouse clilck > \> \> pmb = 0 ; > \> \> while pmb == 0 > \> \> [Xmouse,Ymouse,buttons] = GetMouse() ; > \> \> if any(buttons) > \> \> fprintf('Someone''s pressing a mouse button!\n'); > \> \> MouseClick = [clock,buttons,Xmouse,Ymouse] ; > \> \> pmb = 1 ; > \> \> end > \> \> end > \> \> > \> \> %% -------------- Close PSICHTOOLBOX Working Window ----------% > \> \> > \> \> Screen('CloseAll'); > \> \> > \>