Point Grey Flea3 USB 3.0 Technical Reference 8 Troubleshooting
8.5 Blemish Pixel Artifacts
Cosmic radiation may cause random pixels to generate a permanently high charge, resulting in a permanently lit, or
'glowing,' appearance. Point Grey tests for and programs white blemish pixel correction into the camera firmware.
In very rare cases, one or more pixels in the sensor array may stop responding and appear black (dead) or white
(hot/stuck).
8.5.1 Pixel Defect Correction
Point Grey tests for blemish pixels on each camera. The mechanism to correct blemish pixels is hard-coded into the
camera firmware, and can be turned off and on by the user. Pixel correction is on by default. The correction algorithm
involves applying the average color or grayscale values of neighboring pixels to the blemish pixel.
The FL3-U3-13E4 camera allows for on-sensor pixel correction which is enabled by default. Users can disable the
on-sensor pixel correction to use the Point Grey FPGA pixel correction. Only one pixel correction algorithm can be
used at a time. If both versions are enabled, the on-sensor pixel correction is used.
Pixel correction is not done in any of the binning modes (page 63) or in
Video Mode 10 (FL3-U3-88S2 only).
Title Article
How Point Grey tests for white blemish pixels Knowledge Base Article 314
Related Knowledge Base Articles
8.5.2 PIXEL_DEFECT_CTRL: 1A60h
Field Bit Description
Presence_Inq [0]
Presence of this feature
0: Not Available, 1: Available
[1-5] Reserved
[5]
FL3-U3-13E4 only—Enable or disable on-sensor pixel correction
0: Off, 1: On
ON_OFF [6]
Enable or disable FPGApixel correction
0: Off, 1: On
[7] Reserved
Max_Pixels [8-19] Maximum number of pixels that can be corrected by the FPGA
Cur_Pixels [20-31] Current number of pixels that are being corrected by the FPGA
FL3-U3-13E4 only—If both bits 5 and 6 are set to 1, only the on-sensor pixel correction is enabled.
Format:
Revised 9/27/2012
Copyright ©2011-2012 Point Grey Research Inc.
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