Image processing pipeline: Resize, Gaussian blur, Rotate and Blend

Generic opencl pipeline builder is used to have an example image processing pipeline with an open source gpgpu API:

its tutorial:

running all kernels and device-to-host(and host-to-device) copies concurrently helps reduce GPU timeline bubbles(idle time spans) and makes it more efficient.

R7-240 GPU at 950 MHz(320 cores) can compute these stages:

3k * 3k to 1k * 1k resize (rgba)

blur(7x7 stencil size) on 1k*1k image (rgba)

rotate 1k*1k (rgba)

blend 1k*1k with another image (rgba)

in

Serial pipeline: 14ms

Parallel pipeline: 10ms

so a GTX Titan XP would accomplish these tasks under 1 ms or it would produce 1000 images per second.

OpenCL kernel codes of this example can be found here: