OmniView OV7620 Specialized Driver Patch for Linux

Unpatched Greyscale (scaled, normalized)	Patched Greyscale (scaled, normalized)

Overview

This patch modifies the Linux OV511 driver, which already includes decent support for the OV7620 sensor. This patch fixes greyscale output and exposes various camera features that may be useful for specialized applications.

Limitations

This patch supports only those bridges supported by the Linux OV511 driver.

Bugfixes

Greyscale mode should now work properly.

Enhancements

Added rgb_raw option to output raw RGB data, with optional gamma correction. rgb_raw=1 uses the camera-default gamma curves, whereas rgb_raw=2 uses linear gamma. (0 by default)
Added rapid_adjust option for fast white balance and exposure changes, enabled by rapid_adjust=1. (0 by default)
Added low_pass option to allow disabling of the low-pass filter. low_pass=0 disables it. (1 by default)
Added black_lines option to output several initial lines at camera black level. black_lines=1 enables this feature. (0 by default)

Notes

Nonzero rgb_raw will enable the CCIR range clip, which limits output values to a range between 16 and 240. Actual outputs may be limited even further. This choice is based on the author's never having seen black levels anywhere near zero when the clip was disabled.
Nonzero rgb_raw automatically disables the low pass filter.

Download

This patch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

linux-ov7620.patch (for Linux 2.6.7).