debug.cc

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/** Scales an image in to the correct range for bytes.
@param hi Brightest pixel in the image 
@param lo Dimmest pixel in the image
@param im Image to scale
@returns scaled image
@ingroup gDebug
*/
Image<byte> scale_to_bytes(const Image<float>& im, float lo, float hi)
{
    Image<byte> out(im.size());
    for(int r=0; r < out.size().y-0; r++)
        for(int c=0; c < out.size().x-0; c++)
            out[r][c] = (int)floor((im[r][c]-lo)*255/(hi-lo));

    return out;
}

/** Find the variance of every patch in the image and save it to a file
@ingroup gDebug
@param ims List of images.
*/
void test_output_patch_variance(const vector<Image<float> >&  ims)
{
    assert_same_size(ims);

    int rr = GV3::get<int>("test.variance.radius", 1, -1);
    ImageRef r(rr, rr);
    ImageRef size = r*2 + ImageRef(1,1);

    Image<float> stds(ims.front().size(), 0);

    ImageRef p; 
    for(ImageRef p(0,0); p.y < stds.size().y - size.y; p.y++)
    {
        for(p.x=0; p.x < stds.size().x - size.x; p.x++)
            stds[p + r] = sqrt(mean_and_variance(sub_images(ims, p, size)).second);
    }

    SubImage<float> s = stds.sub_image(ImageRef(2,2), stds.size() - ImageRef(4,4));

    float hi = *max_element(s.begin(), s.end());
    float lo = *min_element(s.begin(), s.end());
    cerr << hi << " " << lo << endl;
    img_save(scale_to_bytes(stds, lo, hi), "test_variance.png");
}