opencl-resizer
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vencabkk
Fastest image resizer
OpenCL Resizer
Goal
Goal of this project is to explore performance of OpenCL and its applications on image processing.
What it does
It's a high performance image resizing utility. It supports JPEG images and 3 sampling methods:
- nearest neighbor
- linear interpolation
- cubic interpolation
How fast is it
For high resolution images (2k+) it is faster than OpenCV. It's not particularly fast for low resolution images due to overhead of data transfer between CPU and GPU.
How does it work
It resizes images on GPU (when found) rather than CPU. Detailed explanation can be found on my blog http://vaclavsamec.com/blog_resizer.
How to use it
Call resizer with these parameters:
| Parameter | Description | Default |
|---|---|---|
-input |
input directory of JPEG images | required |
-output |
output directory of resized images | required |
-quality |
quality of output JPEG image in range <1, 100> | 95 |
-algo |
sampling algorithm, use one of these [nn, linear cubic] |
cubic |
-ratio |
ratio of resizing | 1.0 |
Example
resizer -output ./testImages/output -input ./testImages/input -quality 95 -algo cubic -ratio 0.5
How to build it
You need C++ compiler and following libraries:
- OpenCL
- Libjpeg Turbo
- CMake
See CMakeList.txt for further adjustments of libraries path.
vencabkk