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Opencv Repeatability Result not make sence?

Hi i'm trying to evaluate SIFT and SURF Detectors by Repeatability criteria.

i find out that below method can find Repeatability ,Correspondence of SIFT and SURF

 cv::evaluateFeatureDetector(img_1c, img_2c, h12, &key_points_1, &key_points_2, repeatability, corrCounter);

some of the result are listed below:

Number  Repeatibility   Correspond  Keypoint 1st    Keypoint 2th    
1to2    0.7777778            140        224              180    
1to3    0.7125               114        224              161    
1to4    0.704918              86        224              123    
1to5    0.6853933             61        224               89    
1to6    0.6521739             45        224               69

for first row repeatibility can compute as --> (correnspond)/min(keypoint1st,keypoint2th) = (140/180) = 0.7777778 but for other rows it's value is different from what i compute with above formula.

can somebody tell why is that happening? Best Regards.

Opencv Repeatability Result not make sence?sense?

Hi i'm trying to evaluate SIFT and SURF Detectors by Repeatability criteria.

i find out that below method can find Repeatability ,Correspondence of SIFT and SURF

 cv::evaluateFeatureDetector(img_1c, img_2c, h12, &key_points_1, &key_points_2, repeatability, corrCounter);

some of the result are listed below:

Number  Repeatibility   Correspond  Keypoint 1st    Keypoint 2th    
1to2    0.7777778            140        224              180    
1to3    0.7125               114        224              161    
1to4    0.704918              86        224              123    
1to5    0.6853933             61        224               89    
1to6    0.6521739             45        224               69

for first row repeatibility can compute as --> (correnspond)/min(keypoint1st,keypoint2th) = (140/180) = 0.7777778 but for other rows it's value is different from what i compute with above formula.

can somebody tell why is that happening? Best Regards.