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focal length, preset and license

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Roz K
2025-09-20 12:53:45 +02:00
parent acd59515aa
commit 676e63eae5
5 changed files with 828 additions and 103 deletions
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49
gopro_8:7/unfish_gopro_8:7.glsl
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@ -1,13 +1,26 @@
#version 130
// RozK
// Fisheye removal for GoPro 11+, 8:7 ratio, without hypersmooth
// Copyright (C) 2025 Jean-Baptiste Berlioz
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
#extension GL_ARB_texture_rectangle: enable
#undef highp // defined by Qt-OpenGl
#define rotate_180
//#define debug_borders
#undef highp // defined by Qt-OpenGl
precision highp float;
// uniforms
@ -19,9 +32,8 @@ uniform float pts;
// parameters
const vec2 sensor_size = vec2(5.949440, 5.205760);
const vec2 pixel_scale = vec2(0.871558, 1.0);
const float equidistant_focal_length = 2.920000;
const float rectilinear_focal_length = 2.102263;
const float equidistant_focal_length = 3.020000;
const float rectilinear_focal_length = 2.232346;
// constants
const int subsampling = 4;
@ -36,39 +48,34 @@ vec2 sensor_to_texture;
void initialize() {
texture_center = myResolution * 0.5;
texture_to_sensor = (sensor_size / myResolution) * pixel_scale;
texture_to_sensor = sensor_size / myResolution;
#ifdef rotate_180
texture_to_sensor *= -1.0;
#endif
sensor_to_texture = (myResolution / sensor_size);
sensor_to_texture = myResolution / sensor_size;
}
vec2 unfish_coord(const in vec2 coord) {
vec2 equidistant_to_rectilinear(const in vec2 coord) {
float rectilinear_radius = length(coord);
float rectilinear_angle = atan(rectilinear_radius / rectilinear_focal_length);
float equidistant_radius = rectilinear_angle * equidistant_focal_length;
return coord * (equidistant_radius / rectilinear_radius);
}
vec4 unfish_pixel(const in vec2 coord) {
vec2 unfished = unfish_coord((coord - texture_center) * texture_to_sensor);
vec2 y_coord = texture_center + unfished * sensor_to_texture;
// y_coord.y = coord.y;
vec4 sample_texture(const in vec2 coord) {
vec2 rectilinear = equidistant_to_rectilinear((coord - texture_center) * texture_to_sensor);
vec2 y_coord = texture_center + rectilinear * sensor_to_texture;
#ifdef debug_borders
if (y_coord.x < 0.0 || y_coord.y < 0.0 || y_coord.x > myResolution.x || y_coord.y > myResolution.y) {
return vec4(1.0);
}
#endif
vec2 uv_coord = y_coord * 0.5;
return vec4(
texture2DRect(myTextureY, y_coord).r,
texture2DRect(myTextureU, uv_coord).r,
texture2DRect(myTextureV, uv_coord).r,
1.0
);
texture2DRect(myTextureY, y_coord).x,
texture2DRect(myTextureU, uv_coord).x,
texture2DRect(myTextureV, uv_coord).x,
1.0);
}
void main() {
@ -80,7 +87,7 @@ void main() {
for (int y = 0; y < subsampling; y++) {
for (int x = 0; x < subsampling; x++) {
vec2 offset = subsampling_start + subsampling_step * vec2(x, y);
pixel += unfish_pixel(coord + offset);
pixel += sample_texture(coord + offset);
}
}