/// <summary>
/// Encodes the specified <see cref="SkeletonImage"/> into a byte array.
/// </summary>
/// <remarks>
/// This codification uses two bytes to store <see cref="SkeletonImage.Width"/>; two more bytes to store <see cref="SkeletonImage.Height"/>; and one bit for each pixel of the <see cref="SkeletonImage"/>. Therefore, this method is ineffective for values of <see cref="SkeletonImage.Width"/> and <see cref="SkeletonImage.Height"/> greater than 65535.
/// </remarks>
/// <param name="skImg">The <see cref="SkeletonImage"/> object which is going to be encoded to a byte array.</param>
/// <returns>The byte array containing the encoded <see cref="SkeletonImage"/> object.</returns>
public static byte[] ToByteArray(SkeletonImage skImg)
{
int length = (int)Math.Ceiling(skImg.Width * skImg.Height / 8.0);
byte[] raw = new byte[length + 4];
raw[0] = (byte)(255 & skImg.Width);
raw[1] = (byte)(255 & (skImg.Width >> 8));
raw[2] = (byte)(255 & skImg.Height);
raw[3] = (byte)(255 & (skImg.Height >> 8));
int counter = 0;
int cursor = 4;
int currValue = 0;
for (int i = 0; i < skImg.Height; i++)
{
for (int j = 0; j < skImg.Width; j++)
{
currValue |= (skImg[i, j] == 255 ? 1 : 0) << counter;
if (counter == 7)
{
raw[cursor++] = (byte)currValue;
currValue = 0;
counter = 0;
}
else
{
counter++;
}
}
}
return(raw);
}
internal JYMtiaDescriptor(SkeletonImage skeletonImage, List<Minutia> minutiae, short mainMtiaIdx, short mtiaIdx0, short mtiaIdx1)
{
this.minutiae = minutiae;
this.mainMtiaIdx = mainMtiaIdx;
nearestMtiaIdx = mtiaIdx0;
farthestMtiaIdx = mtiaIdx1;
MtiaEuclideanDistance dist = new MtiaEuclideanDistance();
dist0 = dist.Compare(MainMinutia, NearestMtia);
dist1 = dist.Compare(MainMinutia, FarthestMtia);
if (dist1 < dist0)
{
nearestMtiaIdx = mtiaIdx1;
farthestMtiaIdx = mtiaIdx0;
double temp = dist0;
dist0 = dist1;
dist1 = temp;
}
alpha0 = ComputeAlpha(MainMinutia, NearestMtia);
alpha1 = ComputeAlpha(MainMinutia, FarthestMtia);
beta0 = ComputeBeta(MainMinutia, NearestMtia);
beta1 = ComputeBeta(MainMinutia, FarthestMtia);
ridgeCount0 = ComputeRidgeCount(skeletonImage, MainMinutia, NearestMtia);
ridgeCount1 = ComputeRidgeCount(skeletonImage, MainMinutia, FarthestMtia);
}
/// <summary>
/// Save the specified <see cref="SkeletonImage"/> to the specified file name.
/// </summary>
/// <remarks>
/// Before saving, the <see cref="SkeletonImage"/> is encoded using the method <see cref="ToByteArray"/>.
/// </remarks>
/// <param name="fileName">The file name where the specified <see cref="SkeletonImage"/> will be saved.</param>
/// <param name="skImg">The <see cref="SkeletonImage"/> to be saved.</param>
public static void Serialize(string fileName, SkeletonImage skImg)
{
var byteArr = ToByteArray(skImg);
File.WriteAllBytes(fileName, byteArr);
}
/// <summary>
/// Encodes the specified <see cref="SkeletonImage"/> into a byte array.
/// </summary>
/// <remarks>
/// This codification uses two bytes to store <see cref="SkeletonImage.Width"/>; two more bytes to store <see cref="SkeletonImage.Height"/>; and one bit for each pixel of the <see cref="SkeletonImage"/>. Therefore, this method is ineffective for values of <see cref="SkeletonImage.Width"/> and <see cref="SkeletonImage.Height"/> greater than 65535.
/// </remarks>
/// <param name="skImg">The <see cref="SkeletonImage"/> object which is going to be encoded to a byte array.</param>
/// <returns>The byte array containing the encoded <see cref="SkeletonImage"/> object.</returns>
public static byte[] ToByteArray(SkeletonImage skImg)
{
int length = (int)Math.Ceiling(skImg.Width * skImg.Height / 8.0);
byte[] raw = new byte[length + 4];
raw[0] = (byte)(255 & skImg.Width);
raw[1] = (byte)(255 & (skImg.Width >> 8));
raw[2] = (byte)(255 & skImg.Height);
raw[3] = (byte)(255 & (skImg.Height >> 8));
int counter = 0;
int cursor = 4;
int currValue = 0;
for (int i = 0; i < skImg.Height; i++)
for (int j = 0; j < skImg.Width; j++)
{
currValue |= (skImg[i, j] == 255 ? 1 : 0) << counter;
if (counter == 7)
{
raw[cursor++] = (byte)currValue;
currValue = 0;
counter = 0;
}
else
counter++;
}
return raw;
}
/// <summary>
/// Save the specified <see cref="SkeletonImage"/> to the specified file name.
/// </summary>
/// <remarks>
/// Before saving, the <see cref="SkeletonImage"/> is encoded using the method <see cref="ToByteArray"/>.
/// </remarks>
/// <param name="fileName">The file name where the specified <see cref="SkeletonImage"/> will be saved.</param>
/// <param name="skImg">The <see cref="SkeletonImage"/> to be saved.</param>
public static void Serialize(string fileName, SkeletonImage skImg)
{
var byteArr = ToByteArray(skImg);
File.WriteAllBytes(fileName, byteArr);
}
private byte ComputeRidgeCount(SkeletonImage skeletonImage, Minutia mtia0, Minutia mtia1)
{
return skeletonImage.RidgeCount(mtia0.X, mtia0.Y, mtia1.X, mtia1.Y);
}