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//
// NAME
// Convert.h -- convert between image types, copy images, select bands
//
// DESCRIPTION
// This file defines a number of conversion/copying utilities:
//
// void ScaleAndOffset(CImageOf<T1>& src, CImageOf<T2>& dst,
// float scale, float offset);
// -- scale and offset one image into another (optionally convert type)
//
// void CopyPixels(CImageOf<T1>& src, CImageOf<T2>& dst);
// -- convert pixel types or just copy pixels from src to dst
//
// CImageOf<T> ConvertToRGBA(CImageOf<T> src);
// -- convert from gray (1-band) image to RGBA (alpha == 255)
//
// CImageOf<T> ConvertToGray(CImageOf<T> src);
// -- convert from RGBA (4-band) image to gray, using Y formula,
// Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
//
// void BandSelect(CImageOf<T>& src, CImageOf<T>& dst, int sBand, int dBand);
// -- copy the sBand from src into the dBand in dst
//
// The ScaleAndOffset and CopyPixels routines will reallocate dst if it
// doesn't conform in shape to src. So will BandSelect, except that the
// number of bands in src and dst is allowed to differ (if dst is
// unitialized, it will be set to a 1-band image).
//
// PARAMETERS
// src source image
// dst destination image
// scale floating point scale value (1.0 = no change)
// offset floating point offset value (0.0 = no change)
// sBand source band (0...)
// dBand destination band (0...)
//
// SEE ALSO
// Convert.cpp implementation
// Image.h image class definition
//
// Copyright � Richard Szeliski, 2001.
// See Copyright.h for more details
//
///////////////////////////////////////////////////////////////////////////
template <class T1, class T2>
void ScaleAndOffsetLine(T1* src, T2* dst, int n,
float scale, float offset,
T2 minVal, T2 maxVal);
template <class T1, class T2>
void ScaleAndOffset(CImageOf<T1>& src, CImageOf<T2>& dst,
float scale, float offset);
template <class T1, class T2>
void CopyPixels(CImageOf<T1>& src, CImageOf<T2>& dst)
{
ScaleAndOffset(src, dst, 1.0f, 0.0f);
}
template <class T>
CImageOf<T> ConvertToRGBA(CImageOf<T> src);
template <class T>
CImageOf<T> ConvertToGray(CImageOf<T> src);
template <class T>
void BandSelect(CImageOf<T>& src, CImageOf<T>& dst, int sBand, int dBand);
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