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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

filter

OpenCL memory model

opencl

Source Image

Lena

Results

Normal and OpenCV results

1.Normal Filter

Normal

2.OpenCV

OpenCV

OpenCL_CPU, OpenCL_GPU and OpenCL_Image2D results

1.OpenCL_CPU

OpenCL_CPU

2.OpenCL_GPU

OpenCL_GPU

3.OpenCL_Image2D

OpenCL_GPU

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

runtime

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

dimensiontime

OpenCV & OpenCL_GPU & OpenCL_Image2D

OOO

Contact me

Email: shp395210@outlook.com