Does the evaluateDetectionPrecision function use the 11-point method to calculate mAP?

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Pedro José Carrinho Ribeiro 2021-10-30

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https://ww2.mathworks.cn/matlabcentral/answers/1575423-does-the-evaluatedetectionprecision-function-use-the-11-point-method-to-calculate-map

回答： Pedro José Carrinho Ribeiro 2021-11-12

采纳的回答： Pedro José Carrinho Ribeiro

Hi,

Pretty much the title.

Thanks in advance.

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Answer 1

Pedro José Carrinho Ribeiro 2021-11-12

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Ok, so I found the answer.

Apparently, Pascal VOC calculation changed over the years. It started as calculating mAP using 11 points for the precision-recall curve, and after some years, it changed to using all the unique points. So, if for the validation dataset, 120 points were originated for the precision-recall curve, those 120 points will also be used to calculate mAP, which corresponds to the AUC, in this case.

Short answer: No, it does not use the 11 point method. It uses the total number of unique points to calculate mAP.

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Answer 2

yanqi liu 2021-11-5

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https://ww2.mathworks.cn/matlabcentral/answers/1575423-does-the-evaluatedetectionprecision-function-use-the-11-point-method-to-calculate-map#answer_824279

在 MATLAB Online 中打开

sir，its compute rule as follows

    precision = tp ./ (tp + fp);
    recall = tp ./ numExpected;
    % Change in recall for every true positive.
    deltaRecall = 1/numExpected; 
    ap = sum( precision .* (labels>0) ) * deltaRecall;