局部二值模式LBP（Local Binary Pattern）實現代碼

本文不介紹LBP的理論知識，只是簡單的說說LBP及其變體的實現：

1）最原始的LBP運算元的實現代碼

1. voidlbp(Mat&_src,Mat&_dst)
2. {
3. if(-_dst.empty())
4. _dst.create(_src.rows,_src.cols,CV_8UC1);
5. _dst=cv::Scalar::all(0);
6. //calculatepatterns
7. for(inti=1;i<_src.rows-1;i++)
8. {
9. for(intj=1;j<_src.cols-1;j++)
10. {
11. ucharcenter=_src.at<uchar>(i,j);
12. unsignedcharcode=0;
13. code|=(_src.at<uchar>(i-1,j-1)>=center)<<7;
14. code|=(_src.at<uchar>(i-1,j)>=center)<<6;
15. code|=(_src.at<uchar>(i-1,j+1)>=center)<<5;
16. code|=(_src.at<uchar>(i,j+1)>=center)<<4;
17. code|=(_src.at<uchar>(i+1,j+1)>=center)<<3;
18. code|=(_src.at<uchar>(i+1,j)>=center)<<2;
19. code|=(_src.at<uchar>(i+1,j-1)>=center)<<1;
20. code|=(_src.at<uchar>(i,j-1)>=center)<<0;
21. _dst.at<unsignedchar>(i,j)=code;
22. }
23. }
24. }

2）帶有容忍銀子的LBP運算元[cpp] view plain copy print?

1. voidlbp_with_factor(Mat&_src,Mat&_dst,ucharfactor)//factordefault3
2. {
3. if(-_dst.empty())
4. _dst.create(_src.rows,_src.cols,CV_8UC1);
5. _dst=cv::Scalar::all(0);
6. //calculatepatterns
7. for(inti=1;i<_src.rows-1;i++)
8. {
9. for(intj=1;j<_src.cols-1;j++)
10. {
11. ucharcenter=_src.at<uchar>(i,j)+factor;
12. unsignedcharcode=0;
13. code|=(_src.at<uchar>(i-1,j-1)>=center)<<7;
14. code|=(_src.at<uchar>(i-1,j)>=center)<<6;
15. code|=(_src.at<uchar>(i-1,j+1)>=center)<<5;
16. code|=(_src.at<uchar>(i,j+1)>=center)<<4;
17. code|=(_src.at<uchar>(i+1,j+1)>=center)<<3;
18. code|=(_src.at<uchar>(i+1,j)>=center)<<2;
19. code|=(_src.at<uchar>(i+1,j-1)>=center)<<1;
20. code|=(_src.at<uchar>(i,j-1)>=center)<<0;
21. _dst.at<unsignedchar>(i,j)=code;
22. }
23. }
24. }

3）帶有乘性因子的LBP運算元[cpp] view plain copy print?

1. //這裡需要採用2個字元來編碼，如00、01、10、11
2. voidlbp_with_factor(Mat&_src,Mat&_dst,floatfactor)//facotrdefault0.1
3. {
4. if(-_dst.empty())
5. _dst.create(_src.rows,_src.cols,CV_8UC1);
6. _dst=cv::Scalar::all(0);
7. //calculatepatterns
8. for(inti=1;i<_src.rows-1;i++)
9. {
10. for(intj=1;j<_src.cols-1;j++)
11. {
12. ucharcenter=_src.at<uchar>(i,j);
13. intup=center*(1.0+factor);
14. intdown=center*(1.0+factor);
15. unsignedcharcode=0;
16. /*code|=(_src.at<uchar>(i-1,j-1)>=center)<<7;
17. code|=(_src.at<uchar>(i-1,j)>=center)<<6;
18. code|=(_src.at<uchar>(i-1,j+1)>=center)<<5;
19. code|=(_src.at<uchar>(i,j+1)>=center)<<4;
20. code|=(_src.at<uchar>(i+1,j+1)>=center)<<3;
21. code|=(_src.at<uchar>(i+1,j)>=center)<<2;
22. code|=(_src.at<uchar>(i+1,j-1)>=center)<<1;
23. code|=(_src.at<uchar>(i,j-1)>=center)<<0;

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