这段代码是关于图像处理的备忘，使用C语言和VB6实现灰度图像的二值化。代码中包含了从GDI32库调用的函数，用于获取和设置位图数据，以及图像的灰度转换和二值化操作。通过最大类间方差法（Otsu）确定二值化的阈值。示例展示了如何将JPEG图像转换为灰度和二值化图像。
老代码备忘，我对图像处理不是太懂。
注：部分代码引援自网上，话说我到底自己写过什么代码。。。
Private Declare Function GetBitmapBits Lib "gdi32" (ByVal hbitmap As Long, _
ByVal dwCount As Long, _
lpBits As Any) As Long
Private Declare Function SetBitmapBits Lib "gdi32" (ByVal hbitmap As Long, _
ByVal dwCount As Long, _
lpBits As Any) As Long
Private Declare Function GetDIBits Lib "gdi32" (ByVal aHDC As Long, _
ByVal hbitmap As Long, _
ByVal nStartScan As Long, _
ByVal nNumScans As Long, _
lpBits As Any, _
lpBI As BitMapInfo, _
ByVal wUsage As Long) As Long
Private Declare Function SetDIBits Lib "gdi32" (ByVal hdc As Long, _
ByVal hbitmap As Long, _
ByVal nStartScan As Long, _
ByVal nNumScans As Long, _
lpBits As Any, _
lpBI As BitMapInfo, _
ByVal wUsage As Long) As Long
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, _
ByVal hObject As Long) As Long
Private Declare Function CreateDC Lib "gdi32" Alias "CreateDCA" (ByVal lpDriverName As String, _
ByVal lpDeviceName As String, _
ByVal lpOutput As String, _
lpInitData As Long) As Long
Private Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Type BitMapInfoHeader
biSize As Long
biWidth As Long
biHeight As Long
biPlanes As Integer
biBitCount As Integer
biCompression As Long
biSizeImage As Long
biXPelsPerMeter As Long
biYPelsPerMeter As Long
biClrUsed As Long
biClrImportant As Long
End Type
Private Type RGBQuad
rgbBlue As Byte
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