/// <summary>
/// Recognizes an encoded image (e.g., JPG, PNG, etc) provided as an array of bytes
/// </summary>
/// <param name="image_bytes">The raw bytes that compose the image</param>
/// <returns>An AlprResponse object that contains the results of the recognition</returns>
/// <exception cref="InvalidOperationException">Thrown when the library has not been initialized</exception>
public AlprResponse Recognize(byte[] image_bytes)
{
check_initialization();
NativeROI roi;
roi.x = 0;
roi.y = 0;
roi.width = REALLY_BIG_PIXEL_WIDTH;
roi.height = REALLY_BIG_PIXEL_WIDTH;
IntPtr unmanagedArray = Marshal.AllocHGlobal(image_bytes.Length);
Marshal.Copy(image_bytes, 0, unmanagedArray, image_bytes.Length);
IntPtr resp_ptr = openalpr_recognize_encodedimage(this.native_instance, unmanagedArray, image_bytes.Length, roi);
Marshal.FreeHGlobal(unmanagedArray);
// Commented out test JSON string
//string json = @"{""version"":2,""data_type"":""alpr_results"",""epoch_time"":1476716853320,""img_width"":600,""img_height"":600,""processing_time_ms"":116.557533,""regions_of_interest"":[{""x"":0,""y"":0,""width"":600,""height"":600}],""results"":[{""plate"":""627WWI"",""confidence"":94.338623,""matches_template"":1,""plate_index"":0,""region"":""wa"",""region_confidence"":82,""processing_time_ms"":50.445648,""requested_topn"":10,""coordinates"":[{""x"":242,""y"":360},{""x"":358,""y"":362},{""x"":359,""y"":412},{""x"":241,""y"":408}],""candidates"":[{""plate"":""627WWI"",""confidence"":94.338623,""matches_template"":1},{""plate"":""627WKI"",""confidence"":80.588486,""matches_template"":1},{""plate"":""627WI"",""confidence"":79.943542,""matches_template"":0},{""plate"":""627WVI"",""confidence"":79.348930,""matches_template"":1},{""plate"":""627WRI"",""confidence"":79.196785,""matches_template"":1},{""plate"":""627WNI"",""confidence"":79.165802,""matches_template"":1}]}]}";
string json = Marshal.PtrToStringAnsi(resp_ptr);
AlprResponse response = JsonConvert.DeserializeObject <AlprResponse>(json);
openalpr_free_response_string(resp_ptr);
return(response);
}
/// <summary>
/// Recognizes an image from a .NET Bitmap object
/// </summary>
/// <param name="bitmap">The .NET Bitmap object to recognize</param>
/// <returns>An AlprResponse object that contains the results of the recognition</returns>
/// <exception cref="InvalidOperationException">Thrown when the library has not been initialized</exception>
public AlprResponse Recognize(System.Drawing.Image image)
{
check_initialization();
System.Drawing.Bitmap clone = new System.Drawing.Bitmap(image.Width, image.Height, System.Drawing.Imaging.PixelFormat.Format32bppRgb);
using (System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(clone))
{
gr.DrawImage(image, new System.Drawing.Rectangle(0, 0, clone.Width, clone.Height));
}
System.Drawing.Imaging.BitmapData locked_bmp = clone.LockBits(new System.Drawing.Rectangle(0, 0, clone.Width, clone.Height),
System.Drawing.Imaging.ImageLockMode.ReadWrite, clone.PixelFormat);
byte[] raw_bytes = new byte[locked_bmp.Stride * locked_bmp.Height];
System.Runtime.InteropServices.Marshal.Copy(locked_bmp.Scan0, raw_bytes, 0, raw_bytes.Length);
clone.UnlockBits(locked_bmp);
int bytes_per_pixel = System.Drawing.Image.GetPixelFormatSize(clone.PixelFormat) / 8;
NativeROI roi;
roi.x = 0;
roi.y = 0;
roi.width = image.Width;
roi.height = image.Height;
IntPtr unmanagedArray = Marshal.AllocHGlobal(raw_bytes.Length);
Marshal.Copy(raw_bytes, 0, unmanagedArray, raw_bytes.Length);
IntPtr resp_ptr = openalpr_recognize_rawimage(this.native_instance, unmanagedArray, bytes_per_pixel, image.Width, image.Height, roi);
Marshal.FreeHGlobal(unmanagedArray);
string json = Marshal.PtrToStringAnsi(resp_ptr);
AlprResponse response = JsonConvert.DeserializeObject <AlprResponse>(json);
openalpr_free_response_string(resp_ptr);
return(response);
}
