SDAA422 June   2026 TDA4VE-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Understanding OpenVX Kernel Architecture
    1. 2.1 OpenVX Node Execution Flow
    2. 2.2 Host and Target Kernels
    3. 2.3 A72 Target Execution Model
  6. 3Creating a Custom Kernel Package
    1. 3.1 Package Structure
    2. 3.2 Defining the Kernel Interface
  7. 4Developing a Custom OpenVX Node for the A72 Core: A Threshold Example
    1. 4.1 Implementing the Host Kernel
    2. 4.2 Implementing the A72 Target Kernel
    3. 4.3 Accessing Image Buffers on the A72 Core
    4. 4.4 Implementing the Threshold Algorithm
    5. 4.5 Registering the Kernel Package
  8. 5Integrating the Custom Node into vision_apps
    1. 5.1 Implementing the app_custom_threshold Example
    2. 5.2 Example Execution Log
  9. 6Summary
  10. 7References

2.2 Host and Target Kernels

A custom OpenVX kernel consists of two software components.

The Host Kernel executes during graph creation and verification. Its primary responsibilities include defining the kernel interface, validating node parameters, configuring output metadata, and registering the kernel with the OpenVX framework. Since the Host Kernel is involved only during graph construction, it does not contain the processing algorithm itself. The Target Kernel executes when the graph is scheduled. It implements the processing algorithm, accesses input and output data objects, and performs the required computation on the assigned core. Depending on the application, Target Kernels can execute on various processing cores supported by TIOVX.