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Commit 7b784add authored by Patrik Huber's avatar Patrik Huber
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Minor stylistic changes in texture extraction

parent 6be1769e
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Showing with 25 additions and 22 deletions
include/eos/render/texture_extraction.hpp
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......@@ -100,6 +100,7 @@ inline cv::Mat extract_texture(Mesh mesh, cv::Mat affine_camera_matrix, cv::Mat
using cv::Vec2f;
using cv::Vec3f;
using cv::Vec4f;
using cv::Vec3b;
using std::min;
using std::max;
using std::floor;
......@@ -159,13 +160,13 @@ inline cv::Mat extract_texture(Mesh mesh, cv::Mat affine_camera_matrix, cv::Mat
for (int x = min(dst_tri[0].x, min(dst_tri[1].x, dst_tri[2].x)); x < max(dst_tri[0].x, max(dst_tri[1].x, dst_tri[2].x)); ++x) {
for (int y = min(dst_tri[0].y, min(dst_tri[1].y, dst_tri[2].y)); y < max(dst_tri[0].y, max(dst_tri[1].y, dst_tri[2].y)); ++y) {
if (detail::is_point_in_triangle(cv::Point2f(x, y), dst_tri[0], dst_tri[1], dst_tri[2])) {
if (mapping_type == TextureInterpolation::Area){
if (mapping_type == TextureInterpolation::Area) {
// calculate positions of 4 corners of pixel in image (src)
Vec3f homogenous_dst_upper_left(x - 0.5, y - 0.5, 1.f);
Vec3f homogenous_dst_upper_right(x + 0.5, y - 0.5, 1.f);
Vec3f homogenous_dst_lower_left(x - 0.5, y + 0.5, 1.f);
Vec3f homogenous_dst_lower_right(x + 0.5, y + 0.5, 1.f);
Vec3f homogenous_dst_upper_left(x - 0.5f, y - 0.5f, 1.0f);
Vec3f homogenous_dst_upper_right(x + 0.5f, y - 0.5f, 1.0f);
Vec3f homogenous_dst_lower_left(x - 0.5f, y + 0.5f, 1.0f);
Vec3f homogenous_dst_lower_right(x + 0.5f, y + 0.5f, 1.0f);
Vec2f src_texel_upper_left = Mat(warp_mat_org_inv * Mat(homogenous_dst_upper_left));
Vec2f src_texel_upper_right = Mat(warp_mat_org_inv * Mat(homogenous_dst_upper_right));
......@@ -187,35 +188,37 @@ inline cv::Mat extract_texture(Mesh mesh, cv::Mat affine_camera_matrix, cv::Mat
if (detail::is_point_in_triangle(cv::Point2f(a, b), src_texel_upper_left, src_texel_lower_left, src_texel_upper_right) || detail::is_point_in_triangle(cv::Point2f(a, b), src_texel_lower_left, src_texel_upper_right, src_texel_lower_right)) {
if (a < image.cols && b < image.rows) { // if src_texel in triangle and in image
num_texels++;
color += image.at<cv::Vec3b>(b, a);
color += image.at<Vec3b>(b, a);
}
}
}
}
if (num_texels > 0)
color = color / num_texels;
else { // if no corresponding texel found, nearest neighbor interpolation
else { // if no corresponding texel found, nearest neighbour interpolation
// calculate corresponding position of dst_coord pixel center in image (src)
Vec3f homogenous_dst_coord = Vec3f(x, y, 1.f);
Vec3f homogenous_dst_coord = Vec3f(x, y, 1.0f);
Vec2f src_texel = Mat(warp_mat_org_inv * Mat(homogenous_dst_coord));
if ((cvRound(src_texel[1]) < image.rows) && cvRound(src_texel[0]) < image.cols) {
color = image.at<cv::Vec3b>(cvRound(src_texel[1]), cvRound(src_texel[0]));
color = image.at<Vec3b>(cvRound(src_texel[1]), cvRound(src_texel[0]));
}
}
isomap.at<cv::Vec3b>(y, x) = color;
isomap.at<Vec3b>(y, x) = color;
}
else if (mapping_type == TextureInterpolation::Bilinear) {
// calculate corresponding position of dst_coord pixel center in image (src)
Vec3f homogenous_dst_coord(x, y, 1.f);
Vec3f homogenous_dst_coord(x, y, 1.0f);
Vec2f src_texel = Mat(warp_mat_org_inv * Mat(homogenous_dst_coord));
// calculate distances to next 4 pixels
float distance_upper_left = sqrt(powf(src_texel[0] - floor(src_texel[0]), 2) + powf(src_texel[1] - floor(src_texel[1]), 2));
float distance_upper_right = sqrt(powf(src_texel[0] - floor(src_texel[0]), 2) + powf(src_texel[1] - ceil(src_texel[1]), 2));
float distance_lower_left = sqrt(powf(src_texel[0] - ceil(src_texel[0]), 2) + powf(src_texel[1] - floor(src_texel[1]), 2));
float distance_lower_right = sqrt(powf(src_texel[0] - ceil(src_texel[0]), 2) + powf(src_texel[1] - ceil(src_texel[1]), 2));
using std::sqrt;
using std::pow;
float distance_upper_left = sqrt(pow(src_texel[0] - floor(src_texel[0]), 2) + pow(src_texel[1] - floor(src_texel[1]), 2));
float distance_upper_right = sqrt(pow(src_texel[0] - floor(src_texel[0]), 2) + pow(src_texel[1] - ceil(src_texel[1]), 2));
float distance_lower_left = sqrt(pow(src_texel[0] - ceil(src_texel[0]), 2) + pow(src_texel[1] - floor(src_texel[1]), 2));
float distance_lower_right = sqrt(pow(src_texel[0] - ceil(src_texel[0]), 2) + pow(src_texel[1] - ceil(src_texel[1]), 2));
// normalise distances
float sum_distances = distance_lower_left + distance_lower_right + distance_upper_left + distance_upper_right;
......@@ -225,19 +228,19 @@ inline cv::Mat extract_texture(Mesh mesh, cv::Mat affine_camera_matrix, cv::Mat
distance_upper_right /= sum_distances;
// set color depending on distance from next 4 pixels
for (int color = 0; color < 3; color++){
float color_upper_left = image.at<cv::Vec3b>(floor(src_texel[1]), floor(src_texel[0]))[color] * distance_upper_left;
float color_upper_right = image.at<cv::Vec3b>(floor(src_texel[1]), ceil(src_texel[0]))[color] * distance_upper_right;
float color_lower_left = image.at<cv::Vec3b>(ceil(src_texel[1]), floor(src_texel[0]))[color] * distance_lower_left;
float color_lower_right = image.at<cv::Vec3b>(ceil(src_texel[1]), ceil(src_texel[0]))[color] * distance_lower_right;
for (int color = 0; color < 3; ++color) {
float color_upper_left = image.at<Vec3b>(floor(src_texel[1]), floor(src_texel[0]))[color] * distance_upper_left;
float color_upper_right = image.at<Vec3b>(floor(src_texel[1]), ceil(src_texel[0]))[color] * distance_upper_right;
float color_lower_left = image.at<Vec3b>(ceil(src_texel[1]), floor(src_texel[0]))[color] * distance_lower_left;
float color_lower_right = image.at<Vec3b>(ceil(src_texel[1]), ceil(src_texel[0]))[color] * distance_lower_right;
isomap.at<cv::Vec3b>(y, x)[color] = color_upper_left + color_upper_right + color_lower_left + color_lower_right;
isomap.at<Vec3b>(y, x)[color] = color_upper_left + color_upper_right + color_lower_left + color_lower_right;
}
}
else if (mapping_type == TextureInterpolation::NearestNeighbour) {
// calculate corresponding position of dst_coord pixel center in image (src)
Vec3f homogenous_dst_coord = Vec3f(x, y, 1.f);
Vec3f homogenous_dst_coord = Vec3f(x, y, 1.0f);
Vec2f src_texel = Mat(warp_mat_org_inv * Mat(homogenous_dst_coord));
if ((cvRound(src_texel[1]) < image.rows) && (cvRound(src_texel[0]) < image.cols))
......
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