title: Find people with GOCV
body: <p>I worked last year with OpenCV and Python. Today I wanted to try OpenCV using Golang with the GOCV package. I just wanted a simple Python example () to evalute but in Golang. I used even the same parameters (except the hiThresh and finalThreshold, i used the default values). Somehow I cannot get it working with GOCV, he only finds one centered result.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>package main
  
  import (
      "encoding/json"
      "fmt"
      "image"
      "image/color"
  
      "gocv.io/x/gocv"
  )
  
  func main() {
  
      // define default hog descriptor
      hog := gocv.NewHOGDescriptor()
      defer hog.Close()
      hog.SetSVMDetector(gocv.HOGDefaultPeopleDetector())
  
      // color for the rect when faces detected
      blue := color.RGBA{0, 0, 255, 0}
  
      // read image
      img := gocv.IMRead("images/person_010.bmp", 0)
  
      //resize image
      fact := float64(400) / float64(img.Cols())
      newY := float64(img.Rows()) * fact
      gocv.Resize(img, img, image.Point{X: 400, Y: int(newY)}, 0, 0, 1)
  
      // detect people in image
      rects := hog.DetectMultiScaleWithParams(img, 0, image.Point{X: 8, Y: 8}, image.Point{X: 16, Y: 16}, 1.05, 2, false)
  
      // print found points
      printStruct(rects)
  
      // draw a rectangle around each face on the original image,
      // along with text identifing as "Human"
      for _, r := range rects {
          gocv.Rectangle(img, r, blue, 3)
  
          size := gocv.GetTextSize("Human", gocv.FontHersheyPlain, 1.2, 2)
          pt := image.Pt(r.Min.X+(r.Min.X/2)-(size.X/2), r.Min.Y-2)
          gocv.PutText(img, "Human", pt, gocv.FontHersheyPlain, 1.2, blue, 2)
      }
  
      if ok := gocv.IMWrite("loool.jpg", img); !ok {
          fmt.Println("Error")
      }
  
  }
  
  func printStruct(i interface{}) {
      b, err := json.Marshal(i)
      if err != nil {
          fmt.Println(err)
          return
      }
      fmt.Println(string(b))
  }
  </code></pre>
  
  <p>Here is the input image:<br>
  <a href="https://i.stack.imgur.com/2boFZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2boFZ.png" alt="input image"></a></p>
  
  <p>And here is the result:<br>
  <a href="https://i.stack.imgur.com/I1N9x.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/I1N9x.jpg" alt="enter image description here"></a></p>