/// <summary>
/// Compare the ImageData with this Template and return a number from 0-100 that describe how the image close to the template
/// </summary>
public static double Compare(TemplateLogoInfo Template, byte[,] ImageData, int Start_X, int Start_Y, int Threshold)
{
var width = Math.Min(ImageData.GetLength(0) - Start_X, Template.Width);
var height = Math.Min(ImageData.GetLength(1) - Start_Y, Template.Height);
if (width < Template.Width * 0.7)
{
return(0);
}
if (height < Template.Height * 0.7)
{
return(0);
}
byte[] backgroundColors = new byte[Template.BackgroundPixels.Count];
byte[] objectsColors = new byte[Template.ObjectsPixels.Count];
int backgrounCounter = 0, objectsCounter = 0;
foreach (var item in Template.BackgroundPixels)
{
backgroundColors[backgrounCounter++] = ImageData[item.X + Start_X, item.Y + Start_Y];
}
foreach (var item in Template.ObjectsPixels)
{
objectsColors[objectsCounter++] = ImageData[item.X + Start_X, item.Y + Start_Y];
}
var minObjectsPixels = (int)(objectsColors.Length * 0.55);
var minBackgroundPixels = (int)(backgroundColors.Length * 0.8);
Array.Sort(objectsColors, 0, objectsCounter);
var compareColor = objectsColors[objectsColors.Length / 2];
var similarObjectsCount = countCloseValues(objectsColors, compareColor, Threshold);
var differentBackgroundPixelsCount = countDifferentValues(backgroundColors, compareColor, minBackgroundPixels, Threshold + 3);
var failRatio = Math.Min(50.0 * similarObjectsCount / minObjectsPixels, 50.0 * differentBackgroundPixelsCount / minBackgroundPixels);
if (failRatio > 40)
{
}
if (failRatio < 50)
{
return(failRatio);
}
var vaildRatio = (65.0 * similarObjectsCount / objectsColors.Length) + (35.0 * differentBackgroundPixelsCount / backgroundColors.Length);
return(vaildRatio);
}
/// <summary>
/// Compare the ImageData with this Template and return a number from 0-100 that describe how the image close to the template
/// </summary>
public static double DetectLogo(Bitmap source)
{
var imageData = GetBitmapData(source, 1, RGBtoYUV);
TemplateLogoInfo bestTemplate = null;
int bestTemplate_x = 0, bestTemplate_y = 0;
double bestCompareValue = 0, temp;
foreach (var template in LogoTemplates)
{
var width = source.Width - template.Width;
var height = source.Height - template.Height;
for (int i = 0; i < width; i += 2)
{
temp = 0;
for (int j = 0; j < height; j += 2)
{
var compare = Compare(template, imageData, i, j, 20);
if (compare < 50)
{
compare = Math.Max(compare, Compare(template, imageData, i, j, 13));
}
if (compare > temp)
{
temp = compare;
}
if (compare > bestCompareValue)
{
bestCompareValue = compare;
bestTemplate = template;
bestTemplate_x = i;
bestTemplate_y = j;
}
if (bestCompareValue >= 50)
{
break;
}
if (compare < 25)
{
j += 2;
}
}
if (bestCompareValue >= 50)
{
break;
}
if (temp < 25)
{
i += 2;
}
}
if (bestCompareValue >= 50)
{
break;
}
}
//
if (bestTemplate != null && bestCompareValue >= 50)
{
var data = bestTemplate.GetTemplateData(0, 1, 0);
SetBitmapData(data, source, bestTemplate_x, bestTemplate_y, c => c == 0?Color.Empty: Color.Red);
}
return(bestCompareValue);
}
