OpenCL-Image-Filter

This repository is mainly about how to filter an image in GPU platform using OpenCL, further more, a comparison with CPU platform and OpenCV filter2D is studied as well.

Envoronment

OpenCL-intel-sdk-1.2
OpenCV 3.2
CUDA-9.0/OpenCL
Inter(R) Corporation Intel(R) Core(TM) i7-4710MQ CPU@2.5GHZ
NVIDIA Corporation GeForce GTX 850M

How to Run

Buffer Method

$ git clone git@github.com:ShoupingShan/OpenCL-Image-Filter.git
$ cd OpenCL-Image-Filter/src/buffer_method
$ make clean
$ make
$ ./pic

Image2D Method

$ git clone git@github.com:ShoupingShan/OpenCL-Image-Filter.git
$ cd OpenCL-Image-Filter/src/bimage2D_method
$ make clean
$ make
$ ./pic

Note:

1. If you want change input image, you should not only change the width and height in ./pic.cpp line 12, but also in ./CL/oclFilter.cl line 8.
2. Source code in ./pic.cpp line 24 where int gpu = 1 means GPU mode is used and int gpu = 0 means CPU mode is used resprctively.

Details

Image filter process

OpenCL memory model

Source Image

Results

Normal and OpenCV results

1.Normal Filter

2.OpenCV

OpenCL_CPU, OpenCL_GPU and OpenCL_Image2D results

1.OpenCL_CPU

2.OpenCL_GPU

3.OpenCL_Image2D

Run time compare

Method/Time(/s)	Normal	OpenCV	OpenCL(CPU)	OpenCL(GPU)	Image2D
1	0.015371	0.00033	0.005138	0.000637	0.000375
2	0.015318	0.000313	0.005108	0.00064	0.000367
3	0.01417	0.000312	0.005323	0.000651	0.000377
4	0.014164	0.000331	0.005341	0.000621	0.00038
5	0.014439	0.000308	0.005168	0.000623	0.00037
6	0.014289	0.00031	0.006278	0.000624	0.000364
7	0.014349	0.000311	0.005307	0.000625	0.000374
8	0.014133	0.000307	0.00513	0.000624	0.000379
9	0.014122	0.000315	0.005227	0.000624	0.000377
10	0.014315	0.00033	0.005174	0.000629	0.000372
Average Time/s	0.014467	0.0003145	0.0053194	0.0006298	0.000374

Run time changed by image size

Method/Time(/s)	Normal	OpenCV	OpenCL(CPU)	OpenCL(GPU)	Image2D
256*256	0.003827	0.000123	0.001939	0.000408	0.000351
512*512	0.014761	0.0003444	0.005273	0.000589	0.000375
1280*720	0.0050005	0.001282	0.017817	0.001345	0.000485
1920*1080	0.110346	0.002831	0.037708	0.002273	0.000926
2560*1440	0.195084	0.005242	0.06523	0.003523	0.001367
2880*2560	0.390584	0.09822	0.128243	0.009293	0.0022
3840*2160	0.441809	0.0118741	0.143425	0.010045	0.002367
7680*4320	1.7679	0.04676	0.56525	0.029638	0.007554

OpenCV & OpenCL_GPU & OpenCL_Image2D

Contact me

Email: shp395210@outlook.com