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// What it does:
//
// This example uses the VideoCapture class to capture frames from a connected webcam,
// and displays the video in a Window class.
//
// How to run:
//
// go run ./cmd/capwindow/main.go
//
// +build example
package main
import (
"fmt"
"os"
"gocv.io/x/gocv"
)
func main() {
if len(os.Args) < 2 {
fmt.Println("How to run:\n\tcapwindow [camera ID]")
return
}
// parse args
deviceID := os.Args[1]
webcam, err := gocv.OpenVideoCapture(deviceID)
if err != nil {
fmt.Printf("Error opening video capture device: %v\n", deviceID)
return
}
defer webcam.Close()
window := gocv.NewWindow("Capture Window")
defer window.Close()
img := gocv.NewMat()
defer img.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
}
window.IMShow(img)
if window.WaitKey(1) == 27 {
break
}
}
}