/// <summary>
/// 用于N*M切割图片，以生成特征向量
/// </summary>
/// <param name="NMbmp"></param>
/// <param name="N"></param>
/// <param name="M"></param>
/// <returns>返回生成向量的字符串表示</returns>
public string CutNM(Bitmap sourceImage, int xNum, int yNum)//传进来一幅图片，切割、计算每份子图的像素比例，最后输出字符串形式的特征向量
{
float xWidth = sourceImage.Width / xNum;
float yWidth = sourceImage.Height / yNum;
StringBuilder sbresult = new StringBuilder();
for (int countY = 0; countY < yNum; countY++)
{
for (int countX = 0; countX < xNum; countX++)
{
RectangleF cloneRect = new RectangleF(countX * xWidth, countY * yWidth, xWidth, yWidth);
Bitmap kidbmp = sourceImage.Clone(cloneRect, PixelFormat.Format24bppRgb);
double kidpercent = PicUtils.PixlPercent(kidbmp);
//判断是为了以后用split切割时不会出现最后一个数组元素为空的情况
if (countY == yNum - 1 && countX == xNum - 1)
{
sbresult.Append(kidpercent.ToString());
}
else
{
sbresult.Append(kidpercent.ToString() + ",");
}
}
}
return(sbresult.ToString());
}
/// <summary>
/// 将一幅图片以数组的形式存入数据库
/// </summary>
/// <param name="cutbmp"></param>
public void SaveCutBmpToAccess(Bitmap cutbmp) //mark是图片的标记
{
try
{
double pp = PicUtils.PixlPercent(cutbmp);
MemoryStream ms = new MemoryStream();
cutbmp.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
ms.Flush();
//将二进制数据存到byte数字中
byte[] bmpBytes = ms.ToArray();
pictureBox1.Image = Image.FromStream(new MemoryStream(bmpBytes));
StringBuilder sb = new StringBuilder();
for (int i = 0; i < bmpBytes.Length; i++)
{
if (i != bmpBytes.Length - 1)
{
sb.Append(bmpBytes[i] + ",");
}
else
{
sb.Append(bmpBytes[i]);
}
}
if (sb.Length > 65536)
{
sb.Clear();
sb.Append("该图片太大了，字节数超过65536");
}
mycnn.ConnectionString = Myconnstr;
cmd.Connection = mycnn;//出错,因为cmd为空
mycnn.Open();
cmd.CommandText = "delete from AfterCut";
cmd.ExecuteNonQuery();
cmd.CommandText = "insert into AfterCut(content_,pixel_percent) values('" + sb.ToString() + "','" + pp.ToString() + "')";//access数据库中的备注类型最大长度为65536，所以图片不能太大
cmd.ExecuteNonQuery();
}
catch (Exception w)
{
MessageBox.Show(w.ToString());
}
finally
{
mycnn.Close();
}
}