From 787357728b6a48f95dfc4911684c7cd8c89fadbe Mon Sep 17 00:00:00 2001
From: diegohce <diego.cena@gmail.com>
Date: Thu, 3 Oct 2024 00:49:20 -0300
Subject: [PATCH] FaceDetectorYN example

---
 cmd/facedetectYN/main.go | 140 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 cmd/facedetectYN/main.go

diff --git a/cmd/facedetectYN/main.go b/cmd/facedetectYN/main.go
new file mode 100644
index 00000000..bc82dc20
--- /dev/null
+++ b/cmd/facedetectYN/main.go
@@ -0,0 +1,140 @@
+// What it does:
+//
+// This example uses the FaceDetectorYN class to detect faces,
+// and draw a rectangle around each of them, before displaying them within a Window.
+//
+// model files download link:
+// https://github.com/opencv/opencv_zoo/tree/main/models/face_detection_yunet
+//
+// How to run:
+//
+// facedetectYN [camera ID] [model file]
+//
+// 		go run ./cmd/facedetectYN/main.go 0 face_detection_yunet_2023mar.onnx
+//
+
+package main
+
+import (
+	"fmt"
+	"image"
+	"image/color"
+	"os"
+
+	"gocv.io/x/gocv"
+)
+
+func main() {
+	if len(os.Args) < 3 {
+		fmt.Println("How to run:\n\tfacedetectYN [camera ID] [model file]")
+		return
+	}
+
+	// parse args
+	deviceID := os.Args[1]
+	modelFile := os.Args[2]
+
+	// open webcam
+	webcam, err := gocv.OpenVideoCapture(deviceID)
+	if err != nil {
+		fmt.Printf("error opening video capture device: %v\n", deviceID)
+		return
+	}
+	defer webcam.Close()
+
+	// open display window
+	window := gocv.NewWindow("Face Detect YN")
+	defer window.Close()
+
+	// prepare image matrix
+	img := gocv.NewMat()
+	defer img.Close()
+
+	// prepare faces matrix
+	faces := gocv.NewMat()
+	defer faces.Close()
+
+	// colors for the rect faces detected
+	red := color.RGBA{255, 0, 0, 0}
+	green := color.RGBA{0, 255, 0, 0}
+	blue := color.RGBA{0, 0, 255, 0}
+	yellow := color.RGBA{255, 255, 0, 1}
+	pink := color.RGBA{255, 105, 180, 0}
+
+	detector := gocv.NewFaceDetectorYN(modelFile, "", image.Pt(200, 200))
+	defer detector.Close()
+
+	fmt.Printf("Start reading device: %v\n", deviceID)
+	for {
+		if ok := webcam.Read(&img); !ok {
+			fmt.Printf("Device closed: %v\n", deviceID)
+			return
+		}
+		if img.Empty() {
+			continue
+		}
+
+		sz := img.Size()
+		detector.SetInputSize(image.Pt(sz[1], sz[0]))
+
+		detector.Detect(img, &faces)
+
+		if faces.Rows() < 1 {
+			// no faces detected
+			// show the captured frame anyway
+			window.IMShow(img)
+			if window.WaitKeyEx(1) >= 0 {
+				break
+			}
+			continue
+		}
+
+		for r := 0; r < faces.Rows(); r++ {
+
+			x0 := int(faces.GetFloatAt(r, 0))
+			y0 := int(faces.GetFloatAt(r, 1))
+			x1 := x0 + int(faces.GetFloatAt(r, 2))
+			y1 := y0 + int(faces.GetFloatAt(r, 3))
+
+			faceRect := image.Rect(x0, y0, x1, y1)
+
+			rightEye := image.Pt(
+				int(faces.GetFloatAt(r, 4)),
+				int(faces.GetFloatAt(r, 5)),
+			)
+
+			leftEye := image.Pt(
+				int(faces.GetFloatAt(r, 6)),
+				int(faces.GetFloatAt(r, 7)),
+			)
+
+			noseTip := image.Pt(
+				int(faces.GetFloatAt(r, 8)),
+				int(faces.GetFloatAt(r, 9)),
+			)
+
+			rightMouthCorner := image.Pt(
+				int(faces.GetFloatAt(r, 10)),
+				int(faces.GetFloatAt(r, 11)),
+			)
+
+			leftMouthCorner := image.Pt(
+				int(faces.GetFloatAt(r, 12)),
+				int(faces.GetFloatAt(r, 13)),
+			)
+
+			gocv.Rectangle(&img, faceRect, green, 1)
+			gocv.Circle(&img, rightEye, 1, blue, 1)
+			gocv.Circle(&img, leftEye, 1, red, 1)
+			gocv.Circle(&img, noseTip, 1, green, 1)
+			gocv.Circle(&img, rightMouthCorner, 1, pink, 1)
+			gocv.Circle(&img, leftMouthCorner, 1, yellow, 1)
+
+		}
+		// show the image in the window, and wait 1 millisecond
+		window.IMShow(img)
+		if window.WaitKeyEx(1) >= 0 {
+			break
+		}
+	}
+}