慢速相机捕捉

本文关键字：相机 | 更新日期: 2023-09-27 18:13:23

我正在使用Windows 8的媒体捕获类在桌面应用程序中点击照片并将其复制到剪贴板。

我的函数接受两个输入作为参数，1)所需的设备(前置，后置或usb网络摄像头)和2)期望的分辨率

函数如下:

async public void UseCamera(int x, int y)
    {
        MediaCapture _mediaCapture = new MediaCapture();
        var _ImageFormat = ImageEncodingProperties.CreatePng();
        var _fileStream = new InMemoryRandomAccessStream();
        MediaCaptureInitializationSettings _cameraSettings1 = new MediaCaptureInitializationSettings();
        DeviceInformationCollection _deviceInformationCollection = null;
        IReadOnlyList<IMediaEncodingProperties> res;
        _deviceInformationCollection = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
        if (x > _deviceInformationCollection.Count - 1)
        {
            MessageBox.Show("Device Not found");
        }
        else
        {
            _cameraSettings1.VideoDeviceId = _deviceInformationCollection[x].Id;
            _cameraSettings1.AudioDeviceId = "";
            _cameraSettings1.PhotoCaptureSource = PhotoCaptureSource.VideoPreview;
            _cameraSettings1.StreamingCaptureMode = StreamingCaptureMode.Video;
            await _mediaCapture.InitializeAsync(_cameraSettings1);
            res = _mediaCapture.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.VideoPreview);
            uint maxResolution = 0;
            List<int> indexMaxResolution = new List<int>();
            if (res.Count >= 1)
            {
                for (int i = 0; i < res.Count; i++)
                {
                    VideoEncodingProperties vp = (VideoEncodingProperties)res[i];
                    if (vp.Width > maxResolution)
                    {
                        indexMaxResolution.Add(i);
                        maxResolution = vp.Width;
                    }
                }
                indexMaxResolution.Reverse();
                if (y > indexMaxResolution.Count())
                {
                    MessageBox.Show("Maximum supported resolution index : " + (indexMaxResolution.Count - 1).ToString());
                }
                //this is the part that I believe is the trouble maker

                else
                {
                    await _mediaCapture.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.VideoPreview, res[indexMaxResolution.ElementAt(y)]);
                    await _mediaCapture.CapturePhotoToStreamAsync(_ImageFormat, _fileStream);
                    Clipboard.SetImage(Image.FromStream(_fileStream.AsStream()));
                }
            }
        }
    }

功能是工作的，但问题是它是难以置信的慢。拍摄一张照片大约需要4-5秒。谁能告诉我我哪里错了，我怎么能加快速度。因为我测试了我的相机，它可以点击@几乎每秒2张照片…

慢速相机捕捉

如果你将所有的初始化和设备信息查询移动到一个初始化函数中，你可能会看到速度的提高。

根据我的经验，收集设备信息很慢。

尽量提前完成，以便在捕获时间到来时，只需要完成必要的事情。

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