【Golang】使用gocv库编写三帧法

Author： Rehtt
发布时间：August 4, 2021
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Categories： Golang Golang笔记图像处理

# 0x0

三帧法运动检测属于帧间差分法，相关介绍在之前的文章中有介绍。<button class=" btn m-b-xs btn-success  " onclick='window.open("https://rehtt.com/index.php/archives/233/","_blank")'>跳转</button>

这次使用Golang的OpenCV库：gocv <button class=" btn m-b-xs btn-success  " onclick='window.open("https://gocv.io/","_blank")'>跳转</button> 来编写，是最近为了练手gocv而写的第一个demo

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```golang
package main

import (
	"gocv.io/x/gocv"
)

func main() {
	c, err := gocv.VideoCaptureFile("1.mp4")
	if err != nil {
		panic(err)
	}
	mat := gocv.NewMat()
	aMat, bMat := gocv.NewMat(), gocv.NewMat()
	ab, bc := gocv.NewMat(), gocv.NewMat()
	f := gocv.NewMat()
	w, err := gocv.VideoWriterFile("test.mp4", c.CodecString(), c.Get(gocv.VideoCaptureFPS), int(c.Get(gocv.VideoCaptureFrameWidth)), int(c.Get(gocv.VideoCaptureFrameHeight)), false)

for c.Read(&mat) {
		//灰度
		gocv.CvtColor(mat, &mat, gocv.ColorBGRToGray)
		//二值
		gocv.Threshold(mat, &mat, 25, 255, gocv.ThresholdBinary)
		if bMat.Empty() {
			if aMat.Empty() {
				mat.CopyTo(&aMat)
			} else {
				mat.CopyTo(&bMat)
				gocv.AbsDiff(aMat, bMat, &ab)
			}
			continue
		}
		gocv.AbsDiff(bMat, mat, &bc)
		gocv.BitwiseAnd(ab, bc, &f)
		w.Write(f)
		bc.CopyTo(&ab)
		bMat.CopyTo(&aMat)
		mat.CopyTo(&bMat)
	}
	w.Close()
}
```

Last modification：August 4, 2021