private void MatchByMaxDiff()
{
if (imageList.Count >= 2)
{
BitmapImage preImage = imageList[imageList.Count - 2];
BitmapImage curImage = imageList[imageList.Count - 1];
//获取上一次截图的像素点
byte[] prePixels = new byte[(int)preImage.PixelWidth * (int)preImage.PixelHeight * preImage.Format.BitsPerPixel / 8];
preImage.CopyPixels(prePixels, (int)(preImage.PixelWidth * preImage.Format.BitsPerPixel / 8), 0);
//获取本次截图的像素点
byte[] curPixels = new byte[(int)curImage.PixelWidth * (int)curImage.PixelHeight * curImage.Format.BitsPerPixel / 8];
curImage.CopyPixels(curPixels, (int)(curImage.PixelWidth * curImage.Format.BitsPerPixel / 8), 0);
int matchRowCount = 100;
int[] diffVlaues = new int[preImage.PixelWidth];
int pixbytes = preImage.Format.BitsPerPixel / 8;
int oneRowBytesCount = preImage.PixelWidth * pixbytes;
//行
for (int i = 0; i < matchRowCount && i < preImage.PixelHeight - 1; i++)
{
//列
for (int j = 0; j < preImage.PixelWidth; j++)
{
int startIndex = prePixels.Length - (i + 1) * oneRowBytesCount + j * pixbytes;
diffVlaues[j] += Math.Abs(prePixels[startIndex] - prePixels[startIndex - oneRowBytesCount])
+ Math.Abs(prePixels[startIndex + 1] - prePixels[startIndex + 1 - oneRowBytesCount])
+ Math.Abs(prePixels[startIndex + 2] - prePixels[startIndex + 2 - oneRowBytesCount]);
}
}
//寻找差异化最大的一列
int colIndex = diffVlaues.ToList().IndexOf(diffVlaues.Max());
List <byte> colValues = new List <byte>();
int startRowIndex = preImage.PixelHeight > matchRowCount ? preImage.PixelHeight - matchRowCount : 0;
for (int row = startRowIndex; row < preImage.PixelHeight; row++)
{
int startIndex = row * oneRowBytesCount + colIndex * pixbytes;
colValues.Add(prePixels[startIndex]);
colValues.Add(prePixels[startIndex + 1]);
colValues.Add(prePixels[startIndex + 2]);
}
//对比差异化最大的一列
List <byte> curColValues = new List <byte>();
int curPixbytes = curImage.Format.BitsPerPixel / 8;
int curOneRowBytesCount = curImage.PixelWidth * curPixbytes;
for (int row = 0; row < curImage.PixelHeight; row++)
{
int startIndex = row * curOneRowBytesCount + colIndex * curPixbytes;
curColValues.Add(curPixels[startIndex]);
curColValues.Add(curPixels[startIndex + 1]);
curColValues.Add(curPixels[startIndex + 2]);
}
bool isMatch = false;
int matchRow = 0;
int errorCount = 0;
for (int i = errorCount * 3, j = 0; i < curColValues.Count - 2 && j < colValues.Count - 2; i += 3, j += 3)
{
if (curColValues[i] == colValues[j] && curColValues[i + 1] == colValues[j + 1] && curColValues[i + 2] == colValues[j + 2])
{
if (j == colValues.Count - 3)
{
isMatch = true;
matchRow = i / 3;
break;
}
}
else
{
i = errorCount * 3;
errorCount += 1;
j = -3;
}
}
if (isMatch)
{
curPixels = curPixels.Skip((matchRow) * (int)preImage.PixelWidth * preImage.Format.BitsPerPixel / 8).ToArray();
WriteableBitmap bitmap = new WriteableBitmap(curImage.PixelWidth, curImage.PixelHeight - matchRow, 96, 96, curImage.Format, null);
bitmap.WritePixels(new Int32Rect(0, 0, bitmap.PixelWidth, bitmap.PixelHeight), curPixels, (int)curImage.PixelWidth * curImage.Format.BitsPerPixel / 8, 0);
imageList.Remove(curImage);
imageList.Add(ConvertHelper.ToBitmapImage(bitmap));
}
}
}
private void MatchByComparePix()
{
int matchedRow = 0;
if (imageList.Count >= 2)
{
BitmapImage preImage = imageList[imageList.Count - 2];
BitmapImage curImage = imageList[imageList.Count - 1];
//获取上一次截图的像素点
byte[] prePixels = new byte[(int)preImage.PixelWidth * (int)preImage.PixelHeight * preImage.Format.BitsPerPixel / 8];
preImage.CopyPixels(prePixels, (int)(preImage.PixelWidth * preImage.Format.BitsPerPixel / 8), 0);
//获取本次截图的像素点
byte[] curPixels = new byte[(int)curImage.PixelWidth * (int)curImage.PixelHeight * curImage.Format.BitsPerPixel / 8];
curImage.CopyPixels(curPixels, (int)(curImage.PixelWidth * curImage.Format.BitsPerPixel / 8), 0);
bool isMatchAllCol = true;
int startRow = curImage.PixelHeight / 3 * 2;
for (; startRow >= 0; startRow--)
{
int preRow = preImage.PixelHeight - 1;
int curRow = startRow;
isMatchAllCol = true;
int minNum = 10; int num = 0;
for (; num < 30 && preRow >= 0 && curRow >= 0; preRow--, curRow--, num++)
{
int col = 0;
int difCount = 0;
for (; col < preImage.PixelWidth; col += 2)
{
int preIndex = preRow * curImage.PixelWidth * curImage.Format.BitsPerPixel / 8 + col * curImage.Format.BitsPerPixel / 8;
int curIndex = curRow * curImage.PixelWidth * curImage.Format.BitsPerPixel / 8 + col * curImage.Format.BitsPerPixel / 8;
if (prePixels[preIndex] != curPixels[curIndex] || prePixels[preIndex + 1] != curPixels[curIndex + 1] || prePixels[preIndex + 2] != curPixels[curIndex + 2])
{
difCount++;
if (difCount > 10)
{
isMatchAllCol = false;
break;
}
}
}
if (!isMatchAllCol)
{
break;
}
}
if (isMatchAllCol)
{
if (num < minNum)
{
isMatchAllCol = false;
}
break;
}
}
if (isMatchAllCol)
{
matchedRow = startRow;
curPixels = curPixels.Skip((matchedRow + 1) * (int)preImage.PixelWidth * preImage.Format.BitsPerPixel / 8).ToArray();
WriteableBitmap bitmap = new WriteableBitmap(curImage.PixelWidth, curImage.PixelHeight - startRow - 1, 96, 96, curImage.Format, null);
bitmap.WritePixels(new Int32Rect(0, 0, bitmap.PixelWidth, bitmap.PixelHeight), curPixels, (int)curImage.PixelWidth * curImage.Format.BitsPerPixel / 8, 0);
imageList.Remove(curImage);
imageList.Add(ConvertHelper.ToBitmapImage(bitmap));
}
}
}