//public void OnSaveCVMatImage(object sender, OpenCvMatImageArgs e)
//{
// subdivision++;
// if (subdivision == 120)
// {
// subdivision = 0;
// string fileName = "Images/Omni_" + DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss-fff") + ".jpg";
// // Create a Bitmap object based on a BMP file.
// myBitmap = new Bitmap(e.Mat.Bitmap);
// // Get an ImageCodecInfo object that represents the JPEG codec.
// myImageCodecInfo = GetEncoderInfo("image/jpeg");
// // Create an Encoder object based on the GUID
// // for the Quality parameter category.
// myEncoder = Encoder.Quality;
// // Create an EncoderParameters object.
// // An EncoderParameters object has an array of EncoderParameter
// // objects. In this case, there is only one
// // EncoderParameter object in the array.
// myEncoderParameters = new EncoderParameters(1);
// // Save the bitmap as a JPEG file with quality level 25.
// myEncoderParameter = new EncoderParameter(myEncoder, 80L);
// myEncoderParameters.Param[0] = myEncoderParameter;
// myBitmap.Save(fileName, myImageCodecInfo, myEncoderParameters);
// }
//}
public void OnSaveBitmapImage(object sender, BitmapImageArgs e)
{
subdivision++;
if (subdivision == 120)
{
subdivision = 0;
string fileName = "Images/Omni_" + DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss-fff") + ".jpg";
// Create a Bitmap object based on a BMP file.
// myBitmap = new Bitmap(e.Mat.Bitmap);
// Get an ImageCodecInfo object that represents the JPEG codec.
myImageCodecInfo = GetEncoderInfo("image/jpeg");
// Create an Encoder object based on the GUID
// for the Quality parameter category.
myEncoder = Encoder.Quality;
// Create an EncoderParameters object.
// An EncoderParameters object has an array of EncoderParameter
// objects. In this case, there is only one
// EncoderParameter object in the array.
myEncoderParameters = new EncoderParameters(1);
// Save the bitmap as a JPEG file with quality level 25.
myEncoderParameter = new EncoderParameter(myEncoder, 80L);
myEncoderParameters.Param[0] = myEncoderParameter;
e.Bitmap.Save(fileName, myImageCodecInfo, myEncoderParameters);
}
}
/// <summary>
/// 图片有损压缩
/// </summary>
public static MemoryStream GetLossyCompression(Bitmap bitmap, long quality, string mode = "W", int width = 800, int height = 450)
{
int x = 0;
int y = 0;
int ow = bitmap.Width;
int oh = bitmap.Height;
int towidth = width;
int toheight = height;
switch (mode.ToUpper())
{
case "HW": //指定高宽缩放（可能变形）
break;
case "W": //指定宽，高按比例
toheight = oh * towidth / ow;
break;
case "H": //指定高，宽按比例
towidth = ow * toheight / oh;
break;
case "CUT": //指定高宽裁减（不变形）
if ((double)ow / (double)oh > (double)towidth / (double)toheight)
{
ow = oh * towidth / toheight;
y = 0;
x = (bitmap.Width - ow) / 2;
}
else
{
oh = ow * toheight / towidth;
x = 0;
y = (bitmap.Height - oh) / 2;
}
break;
default:
break;
}
using (Image _bitmap = new Bitmap(towidth, toheight))
{
using (Graphics g = Graphics.FromImage(_bitmap))
{
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.SmoothingMode = SmoothingMode.HighQuality;
g.Clear(Color.Transparent);
g.DrawImage(bitmap, new Rectangle(0, 0, towidth, toheight),
new Rectangle(x, y, ow, oh),
GraphicsUnit.Pixel);
MemoryStream ms = new MemoryStream();
ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/jpeg");
System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;
EncoderParameters myEncoderParameters = new EncoderParameters(1);
EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, quality);
myEncoderParameters.Param[0] = myEncoderParameter;
_bitmap.Save(ms, myImageCodecInfo, myEncoderParameters);
return(ms);
}
}
}
