void convertToFloatImage(CByteImage &byteImage, CFloatImage &floatImage) {
CShape sh = byteImage.Shape();
//printf("%d\n", floatImage.Shape().nBands);
//printf("%d\n", byteImage.Shape().nBands);
assert(floatImage.Shape().nBands == min(byteImage.Shape().nBands, 3));
for (int y=0; y<sh.height; y++) {
for (int x=0; x<sh.width; x++) {
for (int c=0; c<min(3,sh.nBands); c++) {
float value = byteImage.Pixel(x,y,c) / 255.0f;
if (value < floatImage.MinVal()) {
value = floatImage.MinVal();
}
else if (value > floatImage.MaxVal()) {
value = floatImage.MaxVal();
}
// We have to flip the image and reverse the color
// channels to get it to come out right. How silly!
floatImage.Pixel(x,sh.height-y-1,min(3,sh.nBands)-c-1) = value;
}
}
}
}
extern void ForwardWarp(CImageOf<T>& src, CImageOf<T>& dst, CFloatImage& disp,
float d_scale, bool line_interpolate, float disp_gap)
{
// Warps src into dst using disparities disp.
// Each disparity is scaled by d_scale
// Note that "empty" pixels are left at their original value
CShape sh = src.Shape();
int w = sh.width, h = sh.height, n_bands = sh.nBands;
float round_offset = (typeid(T) == typeid(float)) ? 0.0f : 0.5f;
if (! sh.SameIgnoringNBands(disp.Shape()))
throw CError("ForwardWarp: disparity image has wrong size");
if (sh != dst.Shape())
dst.ReAllocate(sh);
// Optional clipping (if necessary)
CFloatImage flt;
T minVal = dst.MinVal();
T maxVal = dst.MaxVal();
if (minVal <= flt.MinVal() && maxVal >= flt.MaxVal())
minVal = maxVal = 0;
for (int y = 0; y < h; y++)
{
// determine correct warping direction
int xstart = (d_scale>0 ? 0 : w-1);
int xend = (d_scale>0 ? w : -1 );
int xincr = (d_scale>0 ? 1 : -1 );
float *dp = &disp.Pixel(0, y, 0);
T *ps = &src .Pixel(0, y, 0);
T *pd = &dst .Pixel(0, y, 0);
for (int x = xstart; x != xend; x += xincr)
{
// determine if a line should be drawn
int x2 = x + xincr;
float d_diff = fabs(dp[x] - dp[x2]);
bool draw_line = line_interpolate && (x2 != xend) &&
(d_diff < disp_gap);
// scaled disparity:
float d = d_scale * dp[x];
// line drawing
if (draw_line)
{
float d2 = d_scale * dp[x2];
if (xincr > 0)
draw_intensity_line(&ps[x * n_bands], &ps[x2 * n_bands], pd,
x - d, x2 - d2, w, n_bands, round_offset,
minVal, maxVal);
else
draw_intensity_line(&ps[x2 * n_bands], &ps[x * n_bands], pd,
x2 - d, x - d2, w, n_bands, round_offset,
minVal, maxVal);
continue;
}
// splatting
int xx = x - ROUND(d);
if (xx >= 0 && xx < w)
memcpy(&pd[xx * n_bands], &ps[x * n_bands],
n_bands*sizeof(T));
}
}
}
extern void InverseWarp(CImageOf<T>& src, CImageOf<T>& dst, CFloatImage& disp,
float d_scale, float disp_gap, int order)
{
// Warps src into dst using disparities disp.
// Each disparity is scaled by d_scale
// Note that "empty" pixels are left at their original value
CShape sh = src.Shape();
int w = sh.width, h = sh.height, n_bands = sh.nBands;
int n = w * n_bands;
if (! sh.SameIgnoringNBands(disp.Shape()))
throw CError("InverseWarp: disparity image has wrong size");
if (sh != dst.Shape())
dst.ReAllocate(sh);
// Optional forward warped depth map if checking for visibility
CFloatImage fwd, fwd_tmp;
if (disp_gap > 0.0f)
{
ScaleAndOffset(disp, fwd_tmp, d_scale, 0.0f);
fwd.ReAllocate(disp.Shape());
fwd.FillPixels(-9999.0f);
ForwardWarp(fwd_tmp, fwd, disp, d_scale, true, disp_gap);
}
// Allocate line buffers
std::vector<float> src_buf, dst_buf, dsp_buf;
src_buf.resize(n);
dst_buf.resize(n);
dsp_buf.resize(n);
CFloatImage fimg; // dummy, used for MinVal(), MaxVal()
for (int y = 0; y < h; y++)
{
// Set up (copy) the line buffers
ScaleAndOffsetLine(&src .Pixel(0, y, 0), &src_buf[0], n,
1.0f, 0.0f, fimg.MinVal(), fimg.MaxVal());
ScaleAndOffsetLine(&disp.Pixel(0, y, 0), &dsp_buf[0], w,
d_scale, 0.0f, 0.0f, 0.0f);
ScaleAndOffsetLine(&dst .Pixel(0, y, 0), &dst_buf[0], n,
1.0f, 0.0f, fimg.MinVal(), fimg.MaxVal());
// Forward warp the depth map
float *fwd_buf = (disp_gap > 0.0f) ? &fwd.Pixel(0, y, 0) : 0;
// Process (warp) the line
InverseWarpLine(&src_buf[0], &dst_buf[0], &dsp_buf[0],
w, n_bands, order, fwd_buf, disp_gap);
// Convert back to native type
T minVal = dst.MinVal();
T maxVal = dst.MaxVal();
float offset = (typeid(T) == typeid(float)) ? 0.0f : 0.5; // rounding
if (minVal <= fimg.MinVal() && maxVal >= fimg.MaxVal())
minVal = maxVal = 0;
ScaleAndOffsetLine(&dst_buf[0], &dst.Pixel(0, y, 0), n,
1.0f, offset, minVal, maxVal);
}
}
