SPRAD86A March   2023  – May 2024 AM62A3 , AM62A3-Q1 , AM62A7 , AM62A7-Q1 , AM67A , AM68A , AM69A

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. Introduction
  5. Tuning Overview
  6. Hardware Requirement
  7. Software Requirement
    1. 4.1 Processor SDK Linux
    2. 4.2 TI's Reference Imaging Software
    3. 4.3 ISP Tuning Tool
  8. Sensor Software Integration
    1. 5.1 Overview of Image Pipeline Software Architecture
    2. 5.2 Adding Sensor Driver to SDK
    3. 5.3 Updating TIOVX Modules
      1. 5.3.1 Source Code Change
      2. 5.3.2 Rebuild Modules
    4. 5.4 Update GStreamer Plug-in for VISS
      1. 5.4.1 Update VISS Plug-in Property
      2. 5.4.2 Add Exposure Setting for 2A Algorithm
        1. 5.4.2.1 Gain
        2. 5.4.2.2 Exposure Time
        3. 5.4.2.3 Other Parameters
      3. 5.4.3 Rebuild Plug-ins
      4. 5.4.4 Verify New Sensor in GStreamer Plug-in
  9. Tuning Procedure
    1. 6.1 Verify Functional Operation of Camera Capturing
    2. 6.2 Enable Camera Streaming With Initial VPAC Configuration
      1. 6.2.1 Generate Configuration Files
      2. 6.2.2 Generate DCC Binary Files
      3. 6.2.3 Stream Video With the Initial Configuration
    3. 6.3 Adjust Camera Mounting
  10. Perform Basic Tuning
    1. 7.1 Launch the Tuning Tool and Create a Project
    2. 7.2 Tuning Order
    3. 7.3 Black Level Subtraction
    4. 7.4 Hardware 3A (H3A)
    5. 7.5 PCID
    6. 7.6 Auto White Balance (AWB)
      1. 7.6.1 Capture Raw Images for Different Lighting Conditions
      2. 7.6.2 Tuning AWB
    7. 7.7 Color Correction
  11. Perform Fine Tuning
    1. 8.1 Edge Enhancement (EE)
    2. 8.2 Noise Filter 4 (NSF4)
  12. Live Tuning
    1. 9.1 Requirements
    2. 9.2 Supported Features
      1. 9.2.1 RAW Capture
      2. 9.2.2 YUV Capture
      3. 9.2.3 Live DCC Update
      4. 9.2.4 Exposure Control
      5. 9.2.5 White Balance Control
      6. 9.2.6 Sensor Register Read/Write
  13. 10Summary
  14. 11Revision History

Capture Raw Images for Different Lighting Conditions

To tune the AWB, raw images need to be captured at different lighting conditions. These images are used again in the next step of color-correction tuning. Below are summarized instructions for capturing the required images (see the AWB plug-in guide for detailed information):

  • Set up lighting conditions to: D65, D50, TL84, and A Light (one at a time)
  • Place the color-checker chart in upright position and center of the camera FOV in the light box
    • Make sure brown patch is at the upper-left corner on the first row and black patch is at the lower right corner on the last row
  • Capture well exposed raw images for each lighting condition
    • Wait until automatic exposure adjustment stabilizes (live video output on the monitor is bright enough without apparent saturation or clipping on the white patch. This process is usually done in a few seconds.)
    • Run live video streaming with the initial configuration
    • Raw images can be captured by either of the following two ways:
      • Stop the GStreamer pipeline for streaming. Then run a new GStreamer pipeline to capture a raw image (sensor exposure setting remains unchanged between GStreamer runs).
      • If the AM62A EVM and PC are connected to the same Ethernet, the tuning tool can also capture raw images from EVM directly over Ethernet. From the tool bar of the DCC tuning tool, enter the IP address of the EVM and capture raw images as shown below. For more details, follow the tuning tool user's guide.
 Live Capture Feature of DCC
                    Tuning Tool Figure 7-10 Live Capture Feature of DCC Tuning Tool

Figure 7-11 through Figure 7-14 are examples of well-exposed captures for all of the above-mentioned lighting conditions (note the color differences caused by the color of lighting):

 Color Chart Image Captured
                        With D50 LightingFigure 7-11 Color Chart Image Captured With D50 Lighting
 Color Chart Image Captured
                        With TL84 LightingFigure 7-13 Color Chart Image Captured With TL84 Lighting
 Color Chart Image Captured
                        With D65 LightingFigure 7-12 Color Chart Image Captured With D65 Lighting
 Color Chart Image Captured
                        With A-lightFigure 7-14 Color Chart Image Captured With A-light