package face
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import (
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"unsafe"
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)
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func DecCompare(feat1 []byte, feat2 []byte) float32 {
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ffeat1 := byteSlice2float32Slice(feat1)
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ffeat2 := byteSlice2float32Slice(feat2)
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if len(ffeat1) != len(ffeat2) {
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return 0
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}
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// normalize
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var score float32
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for i := 0; i < len(ffeat1); i++ {
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score += ffeat1[i] * ffeat2[i]
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}
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score += 0.05
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if score > 0.9999 {
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score = 0.9999
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}
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if score < 0.0001 {
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score = 0.0001
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}
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return score
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}
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func byteSlice2float32Slice(src []byte) []float32 {
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if len(src) == 0 {
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return nil
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}
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l := len(src) / 4
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ptr := unsafe.Pointer(&src[0])
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return (*[1 << 26]float32)(ptr)[:l:l]
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}
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