Video and Vision Processing Suite Intel® FPGA IP User Guide

ID 683329
Date 9/30/2024
Public
Document Table of Contents
1. About the Video and Vision Processing Suite 2. Getting Started with the Video and Vision Processing IPs 3. Video and Vision Processing IPs Functional Description 4. Video and Vision Processing IP Interfaces 5. Video and Vision Processing IP Registers 6. Video and Vision Processing IPs Software Programming Model 7. Protocol Converter Intel® FPGA IP 8. 1D LUT Intel® FPGA IP 9. 3D LUT Intel® FPGA IP 10. Adaptive Noise Reduction Intel® FPGA IP 11. Advanced Test Pattern Generator Intel® FPGA IP 12. AXI-Stream Broadcaster Intel® FPGA IP 13. Bits per Color Sample Adapter Intel® FPGA IP 14. Black Level Correction Intel® FPGA IP 15. Black Level Statistics Intel® FPGA IP 16. Chroma Key Intel® FPGA IP 17. Chroma Resampler Intel® FPGA IP 18. Clipper Intel® FPGA IP 19. Clocked Video Input Intel® FPGA IP 20. Clocked Video to Full-Raster Converter Intel® FPGA IP 21. Clocked Video Output Intel® FPGA IP 22. Color Plane Manager Intel® FPGA IP 23. Color Space Converter Intel® FPGA IP 24. Defective Pixel Correction Intel® FPGA IP 25. Deinterlacer Intel® FPGA IP 26. Demosaic Intel® FPGA IP 27. FIR Filter Intel® FPGA IP 28. Frame Cleaner Intel® FPGA IP 29. Full-Raster to Clocked Video Converter Intel® FPGA IP 30. Full-Raster to Streaming Converter Intel® FPGA IP 31. Genlock Controller Intel® FPGA IP 32. Generic Crosspoint Intel® FPGA IP 33. Genlock Signal Router Intel® FPGA IP 34. Guard Bands Intel® FPGA IP 35. Histogram Statistics Intel® FPGA IP 36. Interlacer Intel® FPGA IP 37. Mixer Intel® FPGA IP 38. Pixels in Parallel Converter Intel® FPGA IP 39. Scaler Intel® FPGA IP 40. Stream Cleaner Intel® FPGA IP 41. Switch Intel® FPGA IP 42. Text Box Intel® FPGA IP 43. Tone Mapping Operator Intel® FPGA IP 44. Test Pattern Generator Intel® FPGA IP 45. Unsharp Mask Intel® FPGA IP 46. Video and Vision Monitor Intel FPGA IP 47. Video Frame Buffer Intel® FPGA IP 48. Video Frame Reader Intel FPGA IP 49. Video Frame Writer Intel FPGA IP 50. Video Streaming FIFO Intel® FPGA IP 51. Video Timing Generator Intel® FPGA IP 52. Vignette Correction Intel® FPGA IP 53. Warp Intel® FPGA IP 54. White Balance Correction Intel® FPGA IP 55. White Balance Statistics Intel® FPGA IP 56. Design Security 57. Document Revision History for Video and Vision Processing Suite User Guide

14.3. Black Level Correction IP Functional Description

The Black Level Correction IP removes the pedestal offset value from the input video stream and resizes the result back to the full dynamic range of the video stream. You write pedestal and scaler values for each of the 4 color channels of the 2x2 color filter array over the external processor interface. The IP uses these values to calculate the output video stream. The IP supports arbitrary 2x2 color filter arrays.
Figure 34. Black Level Correction IP Block Diagram

The pedestal remover subtracts the offset values from the input pixel values. The IP clips negative values to zero if you turn off Reflect around zero, or if you turn on Reflect around zero but set the run-time CONTROL register Clip Zero En bit to turn on clipping to zero. The IP reflects the negative values around zero if you turn on Reflect around zero and clear the run-time CONTROL register Clip Zero En bit to turn off clipping at zero.

Figure 35. The effect of reflection around zero

The scaler part of the IP multiplies the intermediate result after subtraction with an arbitrary factor that you program over the external processor interface. You must calculate the correct multiplication factor from the dynamic range of the video stream and the pedestal value. The IP clips the overflowed values to the maximum value of the output video stream.

You must set the color filter array phase to its correct value, which depends on the framing, rotation, and flipping options you apply on the original image that an imaging sensor captures. If you do not set the correct color filter array phase, the IP may mix color channels and produce incorrect outputs.

Figure 36. Examples of 2x2 Color Filter Arrays For a 6x6 section of an image