private void recognize_shapeme()
{
if (template_histograms == null)
{
MessageBox.Show("尚未读取模板。");
return;
}
new Thread(new ThreadStart(() => {
clearLog();
showStatus("搜索中");
foreach (var challenge in splitted_chars)
{
timer.Restart();
var list = challenge.getEdge().Sample(100);
var sc = ShapeContext.ComputeSC2(list);
if (sc.Length < 100)
{
var tmp = new double[100][];
for (int i = 0; i < 100; ++i)
{
tmp[i] = new double[60];
}
for (int i = 0; i < sc.Length; ++i)
{
Array.Copy(sc[i], tmp[i], 60);
}
sc = tmp;
}
#region 量化到shapeme
int[] histogram = new int[100];
for (int i = 0; i < 100; ++i)
{
double[] ds = new double[100];
for (int j = 0; j < 100; ++j)
{
ds[j] = ShapeContext.HistCost(sc[i], shapemes[j]);
}
int id = ds.Select((v, idx) => new ValueIndexPair <double> {
Value = v, Index = idx
})
.OrderBy(p => p.Value)
.First().Index;
++histogram[id];
}
#endregion
#region 计算距离
double[] dists = new double[template_histograms.Length];
for (int i = 0; i < template_histograms.Length; ++i)
{
dists[i] = Jim.OCR.ShapeContext2D.ShapeContext.ChiSquareDistance(histogram, template_histograms[i]);
//dists[i] = Jim.OCR.ShapeContext2D.ShapeContext.HistCost(histogram.Cast<double>().ToArray(), templatehistograms[i].Cast<double>().ToArray());
showProgress((i + 1.0) / template_histograms.Length);
}
#endregion
#region 对结果排序
var arr = dists.Select((d, i) => new ValueIndexPair <double> {
Value = d, Index = i
})
.OrderBy(p => p.Value)
.Select(p => new { Distance = p.Value, Char = template_chars[p.Index] })
//.Where(p => "ABCDEFGHIJKLMNPQRSTUVWXYZ123456789".IndexOf(p.Char) != -1)
.ToArray();
Dictionary <string, int> matchcount = new Dictionary <string, int>();
int knn = 10;
foreach (var pair in arr.Take(knn))
{
string ch = pair.Char;
matchcount[ch] = matchcount.ContainsKey(ch) ? matchcount[ch] + 1 : 1;
}
var match = matchcount.Select(pair => new { Count = pair.Value, Ch = pair.Key })
.Where(v => v.Count > 0)
.OrderByDescending(v => v.Count).ToArray();
string result = "";
foreach (var m in match.Take(3))
{
result += String.Format("Char:'{0}',Accuracy:{1}/{2}\t", m.Ch, m.Count, knn);
}
appendLine(result);
#endregion
}
appendLine("-----------------------------------------------------");
showStatus("搜索完成，共用时{0}ms。", timer.Stop());
})).Start();
}
public Tuple <string, int> Recognize(Image <Gray, byte> challenge)
{
var list = challenge.getEdge().Sample(100);
var sc = ShapeContext.ComputeSC2(list);
if (sc.Length < 100)
{
var tmp = new double[100][];
for (int i = 0; i < 100; ++i)
{
tmp[i] = new double[60];
}
for (int i = 0; i < sc.Length; ++i)
{
Array.Copy(sc[i], tmp[i], 60);
}
sc = tmp;
}
#region 量化到shapeme
int[] histogram = new int[100];
for (int i = 0; i < 100; ++i)
{
double[] ds = new double[100];
for (int j = 0; j < 100; ++j)
{
ds[j] = ShapeContext.HistCost(sc[i], SC.shapemes[j]);
}
int id = ds.Select((v, idx) => new ValueIndexPair <double> {
Value = v, Index = idx
})
.OrderBy(p => p.Value)
.First().Index;
++histogram[id];
}
#endregion
#region 计算距离
double[] dists = new double[SC.template_histograms.Length];
for (int i = 0; i < SC.template_histograms.Length; ++i)
{
dists[i] = Jim.OCR.ShapeContext2D.ShapeContext.ChiSquareDistance(histogram, SC.template_histograms[i]);
//dists[i] = Jim.OCR.ShapeContext2D.ShapeContext.HistCost(histogram.Cast<double>().ToArray(), templatehistograms[i].Cast<double>().ToArray());
}
#endregion
#region 对结果排序
var arr = dists.Select((d, i) => new ValueIndexPair <double> {
Value = d, Index = i
})
.OrderBy(p => p.Value)
.Select(p => new { Distance = p.Value, Char = SC.template_chars[p.Index] })
//.Where(p => "ABCDEFGHIJKLMNPQRSTUVWXYZ123456789".IndexOf(p.Char) != -1)
.Where(p => Filter.IndexOf(p.Char) != -1)
.ToArray();
Dictionary <string, int> matchcount = new Dictionary <string, int>();
foreach (var pair in arr.Take(Knn))
{
string ch = pair.Char;
matchcount[ch] = matchcount.ContainsKey(ch) ? matchcount[ch] + 1 : 1;
}
var match = matchcount.Select(pair => new { Count = pair.Value, Ch = pair.Key })
.Where(v => v.Count > 0)
.OrderByDescending(v => v.Count).ToArray();
//string result = "";
//foreach (var m in match.Take(3)) {
// result += String.Format("Char:'{0}',Accuracy:{1}/{2}\t", m.Ch, m.Count, Knn);
//}
#endregion
return(new Tuple <string, int> {
First = match[0].Ch, Second = match[0].Count
});
}
