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SpainFace recognition technology performance factors and solutions
Release date:2016-01-20
Key performance indicators
Measurement recognition of key performance indicators are:
(1) error rate (False; Accept; Rate; FAR): This is the probability mistaken for someone else designated personnel;
(2) The rejection rate (False; RejectRate; FRR): This is the probability of a designated officer mistaken for other staff.
Threshold computer when using different determination, these two indicators are also different. Under normal circumstances, the error rate FAR; with the threshold increases (to relax the conditions) and increased rejection rate FRR; with the increase of the threshold value decreases. Therefore, you can use the error rate (Equal; Error; Rate; ERR) as a performance index, which is adjusted threshold value, so that the two indicators FAR FAR and FRR are equal; or FRR.
Factors affecting face recognition performance and Solutions
(1) Background and hair: the elimination of background and hair, only recognize a face image portion.
(2) Face in the image plane of translation, scaling, rotation: geometric standardization, face image through rotation, translation, scaling back, the resulting face image to the specified size, two levels, two distance constant.
(3) Face in the image plane of deflection and outside the pitch: You can build a three-dimensional model of a human face, or three-dimensional integration (morphing), will return to the front face picture image.
(4) changes in the location and intensity of the light source: the histogram normalization, can eliminate the effects of partial illumination. Recovery symmetrical shape (symmteric; shape; from; shading) technology from the shadows, the light source can be independent of a position of the image.
(5) The Age of Change: establish aging model face image.
Change (6) expression: the extraction of characteristic changes in the expression insensitive, or face image is divided into images of various organs were then integrated to determine identification.
(7) attachments (glasses, beard) effects.
(8) Change camera: the same person using a different camera shot images are different.
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