Detect blurry images

[acim]

Description

I am trying to detect blurry images according to this Python example

func main() {
	img := gocv.IMRead("dog.webp", gocv.IMReadColor)
	defer img.Close()

	gray := gocv.NewMat()
	defer gray.Close()

	gocv.CvtColor(img, &gray, gocv.ColorBGRToGray)

	blur := gocv.NewMat()
	defer blur.Close()

	gocv.Laplacian(gray, &blur, gocv.MatTypeCV64F, 1, 1, 0, gocv.BorderDefault)

	meanStdDev := gocv.NewMat()
	defer meanStdDev.Close()

	stdDev := gocv.NewMat()
	defer stdDev.Close()

	gocv.MeanStdDev(blur, &meanStdDev, &stdDev)
}

How can I get variance out of meanStdDev or stdDev? I know this code is pretty much ugly. :D

Your Environment

• Operating System and version: Linux Mint 20.3 Una
• OpenCV version used: 4.6.0
• How did you install OpenCV? By instructions from this repository.
• GoCV version used: 0.31.0
• Go version: 1.19.3
• Did you run the env.sh or env.cmd script before trying to go run or go build? No, my build works.