www.pudn.com > 99273898StereoMatch_1_0.zip > StcPreProcess.cpp

/////////////////////////////////////////////////////////////////////////// 
// 
// NAME 
//  StcPreProcess.cpp -- pre-process the images to clean them up or normalize them 
// 
// DESCRIPTION 
//  Currently, we only support iterated binomial blur, to clean up the images 
//  a little.  This should help sub-pixel fitting work better, by making 
//  image shifts closer to a Taylor series expansion, but will result in worse 
//  performance near discontinuity regions and in finely textured regions. 
//  
//  Other potential pre-processing operations (currently not implemented), 
//  might include: 
//    bias and gain normalization 
//    histogram equalization (global or local) 
//    rank statistics pre-processing 
// 
// SEE ALSO 
//  StereoMatcher.h         longer description of this class 
// 
// Copyright © Richard Szeliski, 2001. 
// See Copyright.h for more details 
// 
/////////////////////////////////////////////////////////////////////////// 
 
#include "StereoMatcher.h" 
#include "Convolve.h" 
#include "ImageIO.h" 
#include "Error.h" 
 
void CStereoMatcher::PreProcess() 
{ 
    if (preproc_addnoise_stddev > 0.0f) 
    { 
        // TODO: implement adding noise to input images 
        throw CError("PreProcess: additive noise not yet implemented"); 
    } 
 
    if (preproc_blur_iter <= 0) 
        return; 
 
    if (verbose == eVerboseSummary) 
        fprintf(stderr, "pre-process, "); 
    if (verbose >= eVerboseProgress) 
        fprintf(stderr, "- pre-process: binomial 121 filter iterated %d times\n", 
                preproc_blur_iter); 
 
    StartTiming(); 
    for (int iter = 0; iter < preproc_blur_iter; iter++) 
    { 
        ConvolveSeparable(m_reference, m_reference, ConvolveKernel_121, ConvolveKernel_14641, 
             1.0f, 0.0f, 1, 1); 
        ConvolveSeparable(m_matching, m_matching, ConvolveKernel_121, ConvolveKernel_14641, 
             1.0f, 0.0f, 1, 1); 
    } 
    PrintTiming(); 
 
    // Write out the pre-processed images 
    static bool dump_pre_processed = false;     // reset in debugger 
    if (dump_pre_processed && verbose >= eVerboseDumpFiles) 
    { 
        WriteImage(m_reference, "reprojected/tmp_m_reference.ppm"); 
        WriteImage(m_matching,  "reprojected/tmp_m_matching.ppm"); 
    } 
}