private List <string> DecodeImage(Bitmap image, int maxResultCount, TimeSpan timeOut, bool isMosaic)
{
List <string> result = new List <string>();
int stride;
byte[] rawImg = ImageToByteArray(image, out stride);
DmtxImage dmtxImg = new DmtxImage(rawImg, image.Width, image.Height, DmtxPackOrder.DmtxPack24bppRGB);
dmtxImg.RowPadBytes = stride % 3;
DmtxDecode decode = new DmtxDecode(dmtxImg, 1);
TimeSpan timeLeft = new TimeSpan(timeOut.Ticks);
Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
while (true)
{
if (stopWatch.Elapsed > timeOut)
{
break;
}
DmtxRegion region = decode.RegionFindNext(timeOut);
if (region != null)
{
DmtxMessage msg = isMosaic ? decode.MosaicRegion(region, -1) : decode.MatrixRegion(region, -1);
string message = Encoding.ASCII.GetString(msg.Output);
message = message.Substring(0, message.IndexOf('\0'));
if (!result.Contains(message))
{
result.Add(message);
if (result.Count >= maxResultCount)
{
break;
}
}
}
else
{
break;
}
}
return(result);
}
internal static void GenReedSolEcc(DmtxMessage message, DmtxSymbolSize sizeIdx)
{
byte[] g = new byte[69];
byte[] b = new byte[68];
int bIndex = 0;;
int symbolDataWords = GetSymbolAttribute(DmtxSymAttribute.DmtxSymAttribSymbolDataWords, sizeIdx);
int symbolErrorWords = GetSymbolAttribute(DmtxSymAttribute.DmtxSymAttribSymbolErrorWords, sizeIdx);
int symbolTotalWords = symbolDataWords + symbolErrorWords;
int blockErrorWords = GetSymbolAttribute(DmtxSymAttribute.DmtxSymAttribBlockErrorWords, sizeIdx);
int step = GetSymbolAttribute(DmtxSymAttribute.DmtxSymAttribInterleavedBlocks, sizeIdx);
if (blockErrorWords != symbolErrorWords / step)
{
throw new Exception("Error generation reed solomon error correction");
}
for (int gI = 0; gI < g.Length; gI++)
{
g[gI] = 0x01;
}
// Generate ECC polynomia
for (int i = 1; i <= blockErrorWords; i++)
{
for (int j = i - 1; j >= 0; j--)
{
g[j] = GfDoublify(g[j], i); // g[j] *= 2**i
if (j > 0)
{
g[j] = GfSum(g[j], g[j - 1]); // g[j] += g[j-1]
}
}
}
// Populate error codeword array
for (int block = 0; block < step; block++)
{
for (int bI = 0; bI < b.Length; bI++)
{
b[bI] = 0;
}
for (int i = block; i < symbolDataWords; i += step)
{
int val = GfSum(b[blockErrorWords - 1], message.Code[i]);
for (int j = blockErrorWords - 1; j > 0; j--)
{
b[j] = GfSum(b[j - 1], GfProduct(g[j], val));
}
b[0] = GfProduct(g[0], val);
}
int blockDataWords = GetBlockDataSize(sizeIdx, block);
bIndex = blockErrorWords;
for (int i = block + (step * blockDataWords); i < symbolTotalWords; i += step)
{
message.Code[i] = b[--bIndex];
}
if (bIndex != 0)
{
throw new Exception("Error generation error correction code!");
}
}
}
