//定义Bitmap图像类
public static Bitmap MakeBitmap(DigitImage dImage, int mag)
{
int width = dImage.width * mag;
int height = dImage.height * mag;//获取图像宽和高
//构造Bitmap数据
Bitmap result = new Bitmap(width, height);
//通过Bitmap数据信息构造图片
Graphics gr = Graphics.FromImage(result);
for (int i = 0; i < dImage.height; ++i)
{
for (int j = 0; j < dImage.width; ++j)
{
//设置pixelColor的值
int pixelColor = 255 - dImage.pixels[i][j]; // black digits
//定义RGB值
Color c = Color.FromArgb(pixelColor, pixelColor, pixelColor);
//定义画笔
SolidBrush sb = new SolidBrush(c);
//填充像素
gr.FillRectangle(sb, j * mag, i * mag, mag, mag);
}
}
return(result);
}
//读取图片
public static DigitImage[] LoadData(string pixelFile, string labelFile)
{
int numImages = 60000; //图片总数量
DigitImage[] result = new DigitImage[numImages]; //定义result数组
//创建28 x 28 矩阵
byte[][] pixels = new byte[28][];
for (int i = 0; i < pixels.Length; ++i)
{
pixels[i] = new byte[28];
}
//文件读取操作
FileStream ifsPixels = new FileStream(pixelFile, FileMode.Open);
FileStream ifsLabels = new FileStream(labelFile, FileMode.Open);
//二进制数据信息读取
BinaryReader brImages = new BinaryReader(ifsPixels);
BinaryReader brLabels = new BinaryReader(ifsLabels);
//MNIST 培训像素文件的格式已初始魔法的整数(32 位)值
//在打开后的二进制文件，第一次四个整数是阅读使用 ReadInt32 方法
int magic1 = brImages.ReadInt32(); //读取4字节整数
magic1 = ReverseBytes(magic1); // 数据格式化
int imageCount = brImages.ReadInt32();
imageCount = ReverseBytes(imageCount);
int numRows = brImages.ReadInt32();
numRows = ReverseBytes(numRows);
int numCols = brImages.ReadInt32();
numCols = ReverseBytes(numCols);
int magic2 = brLabels.ReadInt32();
magic2 = ReverseBytes(magic2);
int numLabels = brLabels.ReadInt32();
numLabels = ReverseBytes(numLabels);
for (int di = 0; di < numImages; ++di)
{
for (int i = 0; i < 28; ++i) // get 28x28 pixel values
{
for (int j = 0; j < 28; ++j)
{
byte b = brImages.ReadByte(); //读取字节
pixels[i][j] = b; //像素点赋值
}
}
byte lbl = brLabels.ReadByte(); //读取字节
DigitImage dImage = new DigitImage(28, 28, pixels, lbl); //定义DigitImage对象
result[di] = dImage;
} // Each image
//关闭操作
ifsPixels.Close();
brImages.Close();
ifsLabels.Close();
brLabels.Close();
//返回结果
return(result);
}
//像素点的值
public static string PixelValues(DigitImage dImage)
{
string s = "";//定义string变量
//for循环输出像素值
for (int i = 0; i < dImage.height; ++i)
{
for (int j = 0; j < dImage.width; ++j)
{
s += dImage.pixels[i][j].ToString("X2") + " ";//输出像素的二进制文件
}
//换行
s += Environment.NewLine;
}
return(s);
}
//button2_Click的触发函数定义
private void button2_Click(object sender, EventArgs e)
{
// Display 'next' image
int nextIndex = int.Parse(textBox4.Text);
DigitImage currImage = trainImages[nextIndex];
//放大倍数
int mag = int.Parse(comboBox1.SelectedItem.ToString());
Bitmap bitMap = MakeBitmap(currImage, mag);
//显示图片
pictureBox1.Image = bitMap;
//输出像素二进制数据
string pixelVals = PixelValues(currImage);
textBox5.Text = pixelVals;
//标签赋值
textBox3.Text = textBox4.Text; // Update curr idx
textBox4.Text = (nextIndex + 1).ToString(); // ++next index
//输出结果
listBox1.Items.Add("当前图像索引 = " +
textBox3.Text + " 识别结果 = " + currImage.label);
}
//读取图片
public static DigitImage[] LoadData(string pixelFile, string labelFile)
{
int numImages = 60000;//图片总数量
DigitImage[] result = new DigitImage[numImages];//定义result数组
//创建28 x 28 矩阵
byte[][] pixels = new byte[28][];
for (int i = 0; i < pixels.Length; ++i)
pixels[i] = new byte[28];
//文件读取操作
FileStream ifsPixels = new FileStream(pixelFile, FileMode.Open);
FileStream ifsLabels = new FileStream(labelFile, FileMode.Open);
//二进制数据信息读取
BinaryReader brImages = new BinaryReader(ifsPixels);
BinaryReader brLabels = new BinaryReader(ifsLabels);
//MNIST 培训像素文件的格式已初始魔法的整数(32 位)值
//在打开后的二进制文件，第一次四个整数是阅读使用 ReadInt32 方法
int magic1 = brImages.ReadInt32(); //读取4字节整数
magic1 = ReverseBytes(magic1); // 数据格式化
int imageCount = brImages.ReadInt32();
imageCount = ReverseBytes(imageCount);
int numRows = brImages.ReadInt32();
numRows = ReverseBytes(numRows);
int numCols = brImages.ReadInt32();
numCols = ReverseBytes(numCols);
int magic2 = brLabels.ReadInt32();
magic2 = ReverseBytes(magic2);
int numLabels = brLabels.ReadInt32();
numLabels = ReverseBytes(numLabels);
for (int di = 0; di < numImages; ++di)
{
for (int i = 0; i < 28; ++i) // get 28x28 pixel values
{
for (int j = 0; j < 28; ++j)
{
byte b = brImages.ReadByte();//读取字节
pixels[i][j] = b;//像素点赋值
}
}
byte lbl = brLabels.ReadByte(); //读取字节
DigitImage dImage = new DigitImage(28, 28, pixels, lbl);//定义DigitImage对象
result[di] = dImage;
} // Each image
//关闭操作
ifsPixels.Close();
brImages.Close();
ifsLabels.Close();
brLabels.Close();
//返回结果
return result;
}
//像素点的值
public static string PixelValues(DigitImage dImage)
{
string s = "";//定义string变量
//for循环输出像素值
for (int i = 0; i < dImage.height; ++i)
{
for (int j = 0; j < dImage.width; ++j)
{
s += dImage.pixels[i][j].ToString("X2") + " ";//输出像素的二进制文件
}
//换行
s += Environment.NewLine;
}
return s;
}
//定义Bitmap图像类
public static Bitmap MakeBitmap(DigitImage dImage, int mag)
{
int width = dImage.width * mag;
int height = dImage.height * mag;//获取图像宽和高
//构造Bitmap数据
Bitmap result = new Bitmap(width, height);
//通过Bitmap数据信息构造图片
Graphics gr = Graphics.FromImage(result);
for (int i = 0; i < dImage.height; ++i)
{
for (int j = 0; j < dImage.width; ++j)
{
//设置pixelColor的值
int pixelColor = 255 - dImage.pixels[i][j]; // black digits
//定义RGB值
Color c = Color.FromArgb(pixelColor, pixelColor, pixelColor);
//定义画笔
SolidBrush sb = new SolidBrush(c);
//填充像素
gr.FillRectangle(sb, j * mag, i * mag, mag, mag);
}
}
return result;
}