PhotoCapture.TakePhotoAsync

参数

描述

异步捕获来自网络摄像头的照片并将其保存到磁盘。

此方法可以使用两种方式。您可以使用此方法将网络摄像头中的照片直接捕获到 CPU 内存中。然后，您可以将图像数据应用到纹理以在 Unity 中使用，或将图像数据传递给外部插件。当直接捕获到内存中的照片时，您还将获得空间信息，以便您可以知道图像在空间上是在哪里拍摄的。您还可以将照片直接捕获到磁盘，以 png 或 jpg 格式保存。

将图像以 JPEG 格式保存时，将把EXIF 元数据编码到捕获的图像中。使用 BGRA32 和 NV12 像素格式时，可以将捕获的图像保存为 JPEG 格式。仅当使用 BGRA32 像素格式时，才能将捕获的图像保存为 PNG。

此示例将从网络摄像头捕获图像并将其保存到磁盘。

using UnityEngine;
using System.Collections;
using System.Linq;
using UnityEngine.Windows.WebCam;

public class PhotoCaptureToDiskExample : MonoBehaviour
{
    PhotoCapture photoCaptureObject = null;

    static readonly int TotalImagesToCapture = 3;
    int capturedImageCount = 0;

    // Use this for initialization
    void Start()
    {
        Resolution cameraResolution = PhotoCapture.SupportedResolutions.OrderByDescending((res) => res.width * res.height).First();
        Texture2D targetTexture = new Texture2D(cameraResolution.width, cameraResolution.height);

        PhotoCapture.CreateAsync(false, delegate(PhotoCapture captureObject) {
            Debug.Log("Created PhotoCapture Object");
            photoCaptureObject = captureObject;

            CameraParameters c = new CameraParameters();
            c.hologramOpacity = 0.0f;
            c.cameraResolutionWidth = targetTexture.width;
            c.cameraResolutionHeight = targetTexture.height;
            c.pixelFormat = CapturePixelFormat.BGRA32;

            captureObject.StartPhotoModeAsync(c, delegate(PhotoCapture.PhotoCaptureResult result) {
                Debug.Log("Started Photo Capture Mode");
                TakePicture();
            });
        });
    }

    void OnCapturedPhotoToDisk(PhotoCapture.PhotoCaptureResult result)
    {
        Debug.Log("Saved Picture To Disk!");

        if (capturedImageCount < TotalImagesToCapture)
        {
            TakePicture();
        }
        else
        {
            photoCaptureObject.StopPhotoModeAsync(OnStoppedPhotoMode);
        }
    }

    void TakePicture()
    {
        capturedImageCount++;
        Debug.Log(string.Format("Taking Picture ({0}/{1})...", capturedImageCount, TotalImagesToCapture));
        string filename = string.Format(@"CapturedImage{0}.jpg", capturedImageCount);
        string filePath = System.IO.Path.Combine(Application.persistentDataPath, filename);

        photoCaptureObject.TakePhotoAsync(filePath, PhotoCaptureFileOutputFormat.JPG, OnCapturedPhotoToDisk);
    }

    void OnStoppedPhotoMode(PhotoCapture.PhotoCaptureResult result)
    {
        photoCaptureObject.Dispose();
        photoCaptureObject = null;

        Debug.Log("Captured images have been saved at the following path.");
        Debug.Log(Application.persistentDataPath);
    }
}