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我正在使用Windows 8的媒体捕捉类来单击桌面应用程序中的照片并将其复制到剪贴板。慢速摄像头捕捉
My功能采用两个输入作为参数, 1)所需的设备(前,后或USB网络摄像)和 2)所需的分辨率
这里是功能:
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()));
}
}
}
}
该功能正在工作,但问题是,它非常慢。拍摄照片需要将近4-5秒。任何人都可以告诉我我哪里错了,我怎么能加快速度。因为我测试了我的相机,并且每秒可以拍摄几乎2张图片。
我也试过。我初始化所有三个摄像头并在程序启动前列出他们的分辨率。相机初始化和分辨率索引制作速度非常快,我相信这是实际拍摄速度下降的原因。 – 2013-05-12 17:45:16
您也可以尝试将图像保存在内存中,并只在需要时才写入。剪贴板可能也很慢。据我所知,这是唯一可以改变的东西。也许增加一些定时器可能会帮助您确定最慢的部分。 – 2013-05-12 17:50:32