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OptoFidelity Video Multimeter
– User Manual
12
Measure Motion Blur option
Motion Blur is a display phenomenon, that is typically caused by display’s temporal
characteristics, e.g. settling times, often together with user’s eye tracking (often called
“Retinal Blur”). Slow response times, badly synchronized backlight vs content or
inappropriate persistence can cause visible, perceptual motion blur and ghosting.
Motion Blur has been traditionally measured by complex pursuit or high speed cameras,
and the result has been expressed as blur edge width. This approach is prone to many
issues, especially when dealing with low persistence VR or MR displays and projectors.
12.1
Measure Motion Blur license activation
The Measure Motion Blur option is activated by copying a valid license file into Video
Multimeter’s SD card. The license file name is ‘motion_blur.ini’, and it should be copied
into the folder /frm/license/. The file content is as follows (an example):
; OptoFidelity Video Multimeter license file
; Device serial number: 6
; Feature name: motion_blur
[License]
salt = 8903670837
key = 1935295630
expire = 0
The device serial number must match the physical Video Multimeter device. License
files are generated by OptoFidelity only. License files should not be edited manually.
12.2
Motion Blur measurement method
Video Multimeter’s tristimulus sensor is being used to measure the settling times for
different colors. A special target pattern is used to stimulate the sensor:
The following settling times are measured:
•
Red channel 0% - 50% - 100% - 50% - 0%
•
Blue channel 0% - 50% - 100% - 50% - 0%
•
Green channel 0% - 50% - 100% - 50% - 0%
In general, the resulting waveform looks like this:
