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CAMERA_NOTES.md

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Hardware

  • Sonix SN98660(AFG)
  • USB Devices:
    • Bus 001 Device 001: ID 1d6b:0002 (Linux Foundation USB 2.0 Root Hubjj)
    • Bus 001 Device 002: ID 0bda:0179 (RTL8188ETV Wireless LAN 802.11n Network Adapter)

See http://www.sonix.com.tw/files/1/3EB50406410A1767E050007F0100306D for Sonix datasheet and http://infocenter.arm.com/help/topic/com.arm.doc.ddi0198e/DDI0198E_arm926ejs_r0p5_trm.pdf for processor docs.

Hacks

  • 360-degree rotation: remove the base of the camera (two screws at base plus there are 4 plastic clips) and look at how the rotation occurs. You'll notice a plastic tab that prevents 360-degree rotation. I used a pair of scissors to slightly trim this tab so then rotation occurs unhindered.
  • Improved base stability: the camera's base (the "leg") tended to be quite flimsy and not want to stay up if extended. To fix this, there are two screws to tighten -- one is exposed near the rotating base, closest to the camera and the other is inside the grey base. To get to this, remove the 4 rubber pads on the bottom, remove the screws under each, and the base will open. Tighten both "leg" screws as far as possible and re-piece the camera back together.

Terminology

  • ISP: Image Signal Processing
  • OSD: On Screen Display
  • MD: Motion Detection
  • PM: Private Mask (ability to hide part of the image)
  • AE: Auto Exposure
  • AWB: Auto White Balance
  • M2M: Memory to Memory middleware pathway
  • DRC: Dynamic Range Control (?)
  • IQ: ?? (Image Quality?)
    • NRA: ?
    • NRN: ?

Image Signal Processing (ISP) interface

Most configuration can be carried out by the snx_isp_ctl application. Otherwise, it is possible to use the file descriptor interface for most common aspects of the configuration.

Adjust output image

Some of these aspects such as gamma severely affect the visible content and if tweaked correctly can greatly improve the image. The values shown are the defaults noted on my camera with my specific version.

echo 0x40 > /proc/isp/filter/brightness
echo 0x20 > /proc/isp/filter/contrast
echo 0x64 > /proc/isp/filter/gamma
echo 0x0 > /proc/isp/filter/hue
echo 0x40 > /proc/isp/filter/saturation

The sharpness filter doesn't seem to have any effect if changed directly.

echo 0x3 > /proc/isp/filter/sharpness

Mirror horizontally

echo 0x1 > /proc/isp/sensor/mirror
echo 0x0 > /proc/isp/sensor/mirror

Flip vertically

echo 0x1 > /proc/isp/sensor/flip
echo 0x0 > /proc/isp/sensor/flip

Frame control

ISP Dropping frames

echo 0 > /proc/isp/ae/fps_ctrl

Use Automatic Exposure (AE) exposure time to output average fps

echo 1 > /proc/isp/ae/fps_ctrl

Enable DRC (unknown what this does at this stage; dynamic range control?)

echo 0x1 > /proc/isp/drc/enable
echo 0x0 > /proc/isp/drc/enable