The stimuli were presented using a Mitsubishi Diamond Pro 2070SB CRT Monitor with a resolution of 1027 × 769 pixels. Dell Precision 3500 hardware and a customized MatLab program in combination with the Cambridge Research Systems Visual Stimulus Generator (ViSaGe) were used to create and present the stimuli as well as run the experiment. Gamma correction was carried out, using a Cambridge Research Systems ColorCal and software to produce lookup tables, to correct the monitor’s inherent nonlinear luminance intensities. The change of luminance after the monitor was switched on, was also measured. The results of these measurements indicated that prior to each experimental session, the monitor needed a warm-up time of 30 min to reach a consistent mean luminance level. A four-mirror stereoscope composed of optical components by OptoSigma (OptoSigma Corporation, California, USA) was used and carefully aligned prior the experiments to ensure that each eye would see only one grating.
Colorcal
Manufactured by Cambridge Research Systems
ColorCAL is a precision calibration device designed for color-critical applications. It provides accurate and reliable color measurements to ensure consistent and accurate color reproduction across various display technologies.
Automatically generated - may contain errors
7 protocols using colorcal
1
Calibrated Visual Stimulus Presentation
2
Visual Perception Experiment Setup
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The experiments took place in a darkened room. Stimuli were displayed with a frame rate of 85 Hz on a Mitsubishi DiamondPlus 230 SB CRT monitor with a resolution of 1280 1024. The monitor was calibrated using a Cambridge Research Systems ColorCal or ColorCal MKII. The observer’s head was kept still using a chin rest placed 57 cm from the screen. The active video area subtended a visual angle of 14 . Observers’ eye movements were not restricted and they could scan the video if they wished and time allowed. Experiments were programmed in Matlab using the Psychtoolbox psychophysics library34 . Since our video data was recorded at 50 Hz and the monitor refreshed at 85 Hz, we calculated the optimal video frame to display and used Psychtoolbox’s Screen(‘Flip’) function to schedule frame updates.
3
Experimental Setup for Visual Perception
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A Mitsubishi Diamond Pro 2070SB CRT Monitor with a resolution of 1,027 × 769 pixels was used for stimulus presentation. Dell Precision 3,500 hardware and a customised MatLab program in combination with the Cambridge Research Systems Visual Stimulus Generator (ViSaGe) were used to create and present the stimuli as well as run the experiment. Gamma correction was carried out, using a Cambridge Research Systems ColorCal and software to produce lookup tables, to correct the monitor’s inherent nonlinear luminance intensities after a suitable warm-up period to ensure a consistent mean luminance. A four-mirror stereoscope composed of optical components by OptoSigma (OptoSigma Corporation, California, USA) was used for viewing stimuli. The mirrors were carefully aligned prior to experiments to ensure that only one stimulus was visible to each eye and to ensure that ocular alignment was comfortable.
4
Chromatic and Luminance Calibration for Visual Experiments
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Both experiments were run on a DELL PC equipped with a dedicated visual stimulus generator (ViSaGe; Cambridge Research Systems, Ltd., Kent, UK) and presented on an Ilyama Vision Master Pro 450 CRT monitor. Stimulus presentation was controlled using Matlab (MathWorks, Natick, MA, USA). All staircase procedures used in the experiments were implemented using the Palamedes Toolbox for Matlab (Kingdom & Prins 2010 ). The chromatic and luminance output of the monitor were calibrated using the CRS calibration system (ColorCAL; Cambridge Research Systems, Ltd.); the accuracy of the calibration was verified with a spectroradiometer (SpectroCAL; Cambridge Research Systems, Ltd.). The monitor had been switched on for at least 30 minutes before any experiment. Participants’ viewing distance was 70 cm. A Cedrus R530 (Cedrus Corporation; San Pedro, CA, USA) button box was used to collect participant responses. All stimuli were presented on a neutral background corresponding to the DKL white point. The brightness of the screen varied slightly between Experiments 1 and 2: the white point was set to CIE 1931 0.2998, 0.3107, 46.64 cd/m2 in Experiment 1 and CIE 1931 0.3006, 0.3125, 46.71 cd/m2 in Experiment 2 .
5
Visual Stimuli Presentation Protocol
6
Visual Perception in a Controlled Environment
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Data collection was computer-controlled and all experiments were conducted in a dark room. Stimuli were presented on a cathode ray tube (CRT) monitor (BARCO, Reference Calibrator V, 21 inches, 1844 × 1300 pixels, frame rate 95 Hz) controlled with ViSaGe (Cambridge Research Systems), which allows a 14-bit intensity resolution for each of the red, green, blue (RGB) phosphors. We performed gamma correction using a ColorCAL (Cambridge Research Systems) and spectral calibration was performed with a PR650 spectroradiometer (Photo Research Inc.). Observers were positioned 114 cm from the CRT monitor and the viewing distance was maintained with a chin rest. Observers were asked to view the stimuli binocularly.
7
Spectral Calibration for CRT Display
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Data collection was computer-controlled and all experiments were conducted in a dark room.
Stimuli were presented on a cathode ray tube (CRT) monitor (BARCO, Reference Calibrator V， 21 inches, 1844 × 1300 pixels, frame rate 95Hz) controlled with ViSaGe (Cambridge Research Systems), which allows a 14-bit intensity resolution for each of the RGB phosphors. We performed gamma correction using a ColorCAL (Cambridge Research Systems) and spectral calibration was performed with a PR650 spectroradiometer (Photo Research inc.). Observers were positioned 114 cm from the CRT monitor and the viewing distance was maintained with a chin rest. Observers were asked to view the stimuli binocularly.
Stimuli were presented on a cathode ray tube (CRT) monitor (BARCO, Reference Calibrator V， 21 inches, 1844 × 1300 pixels, frame rate 95Hz) controlled with ViSaGe (Cambridge Research Systems), which allows a 14-bit intensity resolution for each of the RGB phosphors. We performed gamma correction using a ColorCAL (Cambridge Research Systems) and spectral calibration was performed with a PR650 spectroradiometer (Photo Research inc.). Observers were positioned 114 cm from the CRT monitor and the viewing distance was maintained with a chin rest. Observers were asked to view the stimuli binocularly.
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