Video and Vision Processing Suite Intel® FPGA IP User Guide

ID 683329
Date 4/04/2022

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Document Table of Contents

19.1. About the Tone Mapping Operator IP

The tone mapping operator (TMO) Intel FPGA IP dynamically adapts the processing of an image based on a regional (tile-based) approach. It improves the visibility of latent image detail and enhances the overall viewing experience.

You can configure the required number of bits per symbols, symbols per pixel, and pixels in parallel. Typical applications include:

  • Medical imaging
  • Machine vision
  • Video conferencing
  • Surveillance
  • Automotive imaging
Figure 38.  Example of processing a real-life image using the TMO IPThe figure shows example results obtained after applying the TMO IP dataflow on a real-life image: left is the original image; right is the output image after TMO IP processing.

You provide and receive video data to the TMO IP in RGB format via the AXI4-Stream compatible Intel FPGA video streaming interfaces. The IP determines the size of the video busses from the number of pixels processed per clock cycle, the color bit depth, and the number of component streams parameters. The number of video component streams is fixed at 3. The IP supports:

  • Component bit depths of 8, 10 and 12-bit.
  • Pixels per clock of 1, 2 and 4.

You control the strength of the contrast enhancement for the output images provided by the TMO IP via an Avalon memory-mapped control interface. The data bus for the control interface is set to 32-bit to interface with an embedded CPU. During operation, you can configure the TMO IP using a software driver that controls all the IP parameters via a set of software APIs.

The TMO IP allows four modes of operations:

  • Passthrough
  • Contrast-enhancement
  • Horizontal and vertical slider
  • Region of interest

The Example of processing a real-life image using the TMO IP figure shows passthrough and contrast enhancement.

Region of interest allows you to define a specific window withing the active picture, so that the contrast enhancement is only applied in that specific part of the output image.

Figure 39. Examples of horizontal slider and region of interest

The TMO IP supports RGB sampling. The sampling method at the output is always the same as the input. You must provide details of the current standard video resolution via the CPU control interface to ensure correct behavior. the IP only supports 4:4:4 progressive sampling. You should perform any deinterlacing and chroma up or down sampling externally to the TMO IP.