Median Filter

Published: 09/11/2014, Last Updated: 02/12/2015

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Features / Description

The sample demonstrates how to implement efficient median filter with OpenCL™ standard. This implementation relies on auto-vectorization performed by OpenCL compiler. The kernel code minimizes number of color buffer accesses, removes synchronization points, and uses data-level parallelism.

This sample demonstrates a CPU-optimized implementation of 2D image median filtration, showing how to:

  • Implement calculation kernels using OpenCL C99
  • Parallelize the kernels by running several work-groups in parallel
  • Organize host-device data exchange with final image storage on the hard drive.

Supported Devices: CPU, Intel Processor Graphics, Intel® Xeon Phi™ coprocessor
Supported OS: Windows* and Linux* OS
Complexity Level: Novice

Additional Resources

Intel® SDK for OpenCL™ Applications

Product and Performance Information


Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804