Memory leak in ORB detector

[danhab99]

Description

I have a plain and simple implementation of ORB I got using a tutorial. When I try running this function 1000 times I see huge memory usage and it doesn't go down. I'm confident I closed all the gocv resources, I'm not passing mats between goroutines, it's just a pure function.

Steps to Reproduce

import (
    "image"
    "image/draw"

    "gocv.io/x/gocv"
)

func convertToGray(img image.Image) (*image.Gray, error) {
    bounds := img.Bounds()
    gray := image.NewGray(bounds)

    draw.Draw(gray, bounds, img, bounds.Min, draw.Src)

    return gray, nil
}

func Process(img image.Image) (result ProcessResults, err error) {
    gray, err := convertToGray(img)
    if err != nil {
        panic(err)
    }

    mat, err := gocv.ImageGrayToMatGray(gray)
    if err != nil {
        panic(err)
    }
    defer mat.Close()

    orb := gocv.NewORB()
    defer orb.Close()

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

    keypoints, description := orb.DetectAndCompute(mat, mask)
    defer description.Close()

    result.Description = description.ToBytes()
    result.DescCols = description.Cols()
    result.DescRows = description.Rows()
    result.DescType = description.Type()

    result.Keypoints = keypoints

    return
}

Your Environment

• Operating System and version: 5.15.143-1-MANJARO
• OpenCV version used: the one installed here
• How did you install OpenCV? go get gocv.io/x/gocv v0.35.0
• GoCV version used: 0.35.0
• Go version: 1.19
• Did you run the env.sh or env.cmd script before trying to go run or go build? Hope the docker image did