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frame widening maths, cleanup

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Roz K
2025-09-18 06:08:05 +02:00
parent 1385b3e6f3
commit 95175afb5d
2 changed files with 91 additions and 78 deletions
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43
gopro_8:7/unfish_gopro_8:7.glsl
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@ -9,7 +9,6 @@
// #define debug_borders
// uniforms
uniform sampler2DRect myTextureY;
uniform sampler2DRect myTextureU;
uniform sampler2DRect myTextureV;
@ -17,42 +16,41 @@ uniform vec2 myResolution;
uniform float pts;
// parameters
const vec2 sensor_dimensions = vec2(5.949440, 5.205760);
const float fisheye_focal_length = 2.92;
const float rectilinear_focal_length = 2.102263;
const vec2 sensor_size = vec2(5.949440, 5.205760);
const vec2 pixel_scale = vec2(0.871558, 1.0);
const int subsampling = 4;
const float equidistant_focal_length = 2.920000;
const float rectilinear_focal_length = 2.102263;
// constants
const float subsampling_step = 1.0 / float(subsampling);
const float subsampling_start = subsampling_step * 0.5 - 0.5;
const float subsampling_denominator = 1.0 / float(subsampling * subsampling);
const int subsampling = 4;
const vec2 subsampling_step = vec2(1.0 / float(subsampling));
const vec2 subsampling_start = subsampling_step * 0.5 - vec2(0.5);
const float subsampling_scale = 1.0 / float(subsampling * subsampling);
// variables
vec2 texture_center;
vec2 texture_to_sensor;
vec2 sensor_to_texture;
void initialize() {
texture_center = myResolution * 0.5;
texture_to_sensor = (sensor_dimensions / myResolution) * pixel_scale;
sensor_to_texture = (myResolution / sensor_dimensions);
texture_to_sensor = (sensor_size / myResolution) * pixel_scale;
sensor_to_texture = (myResolution / sensor_size);
}
vec2 unfish_coord(const in vec2 coord) {
float rectilinear_distance = length(coord);
float rectilinear_angle = atan(rectilinear_distance / rectilinear_focal_length);
float fisheye_distance = rectilinear_angle * fisheye_focal_length;
return coord * (fisheye_distance / rectilinear_distance);
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;
#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, 1.0, 1.0, 1.0);
@ -74,13 +72,12 @@ void main() {
vec2 coord = gl_TexCoord[0].xy;
vec4 pixel = vec4(0.0, 0.0, 0.0, 0.0);
float x, y = subsampling_start;
for (int column = 0; column < subsampling; column++, y += subsampling_step) {
x = subsampling_start;
for (int row = 0; row < subsampling; row++, x += subsampling_step) {
pixel += unfish_pixel(coord + vec2(x, y));
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);
}
}
gl_FragColor = pixel * subsampling_denominator;
gl_FragColor = pixel * subsampling_scale;
}

126
gopro_8:7/unfish_gopro_8:7.py
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@ -2,85 +2,101 @@
import math
print("\n--- sensor size (millimeters) ---\n")
print("\n--- physical sensor ---\n")
# https://www.sony-semicon.com/files/62/pdf/p-13_IMX677-AAPH5-J_Flyer.pdf
sensor_total_array_width = 5700 # p
sensor_total_array_height = 5160 # p
sensor_total_array_diagonal = math.hypot(sensor_total_array_width, sensor_total_array_height)
sensor_array_horizontal = 5700 # p
sensor_array_vertical = 5160 # p
sensor_array_diagonal = math.hypot(sensor_array_horizontal, sensor_array_vertical)
sensor_pixel_size = 1.12 * 0.001 # mm
sensor_total_width = sensor_total_array_width * sensor_pixel_size
sensor_total_height = sensor_total_array_height * sensor_pixel_size
sensor_total_diagonal = math.hypot(sensor_total_width, sensor_total_height)
sensor_size_horizontal = sensor_array_horizontal * sensor_pixel_size
sensor_size_vertical = sensor_array_vertical * sensor_pixel_size
sensor_size_diagonal = math.hypot(sensor_size_horizontal, sensor_size_vertical)
# sensor_total_diagonal = 8.35 # mm
# sensor_total_width = sensor_total_diagonal * (sensor_total_array_width / sensor_total_array_diagonal)
# sensor_total_height = sensor_total_diagonal * (sensor_total_array_height / sensor_total_array_diagonal)
print("sensor total: width = %.6f, height = %.6f, diagonal = %.6f" % (
sensor_total_width,
sensor_total_height,
sensor_total_diagonal))
sensor_active_array_width = 5599 # p
sensor_active_array_height = 4927 # p
sensor_active_array_diagonal = math.hypot(sensor_active_array_width, sensor_active_array_height)
sensor_active_width = (sensor_active_array_width / sensor_total_array_width) * sensor_total_width
sensor_active_height = (sensor_active_array_height / sensor_total_array_height) * sensor_total_height
sensor_active_diagonal = (sensor_active_array_diagonal / sensor_total_array_diagonal) * sensor_total_diagonal
print("sensor active: width = %.6f, height = %.6f, diagonal = %.6f" % (
sensor_active_width,
sensor_active_height,
sensor_active_diagonal))
print("sensor size : horizontal = %7.3f, vertical = %7.3f, diagonal = %7.3f (mm)" % (
sensor_size_horizontal,
sensor_size_vertical,
sensor_size_diagonal))
# https://community.gopro.com/s/article/HERO11-Black-Video-Settings-And-Resolutions
gopro_array_width = 5312 # p
gopro_array_height = 4648 # p
gopro_array_diagonal = math.hypot(gopro_array_width, gopro_array_height)
gopro_array_horizontal = 5312 # p
gopro_array_vertical = 4648 # p
gopro_array_diagonal = math.hypot(gopro_array_horizontal, gopro_array_vertical)
gopro_sensor_width = (gopro_array_width / sensor_total_array_width) * sensor_total_width
gopro_sensor_height = (gopro_array_height / sensor_total_array_height) * sensor_total_height
gopro_sensor_diagonal = (gopro_array_diagonal / sensor_total_array_diagonal) * sensor_total_diagonal
gopro_size_horizontal = (gopro_array_horizontal / sensor_array_horizontal) * sensor_size_horizontal
gopro_size_vertical = (gopro_array_vertical / sensor_array_vertical) * sensor_size_vertical
gopro_size_diagonal = (gopro_array_diagonal / sensor_array_diagonal) * sensor_size_diagonal
print("gopro active: width = %.6f, height = %.6f, diagonal = %.6f" % (
gopro_sensor_width,
gopro_sensor_height,
gopro_sensor_diagonal))
print("gopro size : horizontal = %7.3f, vertical = %7.3f, diagonal = %7.3f (mm)" % (
gopro_size_horizontal,
gopro_size_vertical,
gopro_size_diagonal))
# https://thinglabs.io/gopro-focal-length-guide
# https://thinglabs.io/gopro-focal-radius-guide
gopro_focal_length = 2.92 # mm
print("\n--- fisheye field of view (degrees) ---\n")
gopro_radius_horizontal = gopro_size_horizontal * 0.5
gopro_radius_vertical = gopro_size_vertical * 0.5
gopro_radius_diagonal = gopro_size_diagonal * 0.5
# https://en.wikipedia.org/wiki/Fisheye_lens
equidistant_angle = lambda length: math.degrees(length / gopro_focal_length)
equidistant_angle = lambda radius: math.degrees(radius / gopro_focal_length)
gopro_fov_width = 2.0 * equidistant_angle(gopro_sensor_width * 0.5)
gopro_fov_height = 2.0 * equidistant_angle(gopro_sensor_height * 0.5)
gopro_fov_diagonal = 2.0 * equidistant_angle(gopro_sensor_diagonal * 0.5)
gopro_fov_horizontal = 2.0 * equidistant_angle(gopro_radius_horizontal)
gopro_fov_vertical = 2.0 * equidistant_angle(gopro_radius_vertical)
gopro_fov_diagonal = 2.0 * equidistant_angle(gopro_radius_diagonal)
print("gopro fov: width = %.6f, height = %.6f, diagonal = %.6f" % (
gopro_fov_width,
gopro_fov_height,
print("gopro fov : horizontal = %7.3f, vertical = %7.3f, diagonal = %7.3f (deg)" % (
gopro_fov_horizontal,
gopro_fov_vertical,
gopro_fov_diagonal))
print("\n--- rectilinear focal length (mm) ---\n")
print("\n--- rectilinear re-projection, preserving vertical fov ---\n")
rectilinear_focal_length = lambda length: length * math.tan(math.radians(90.0 - equidistant_angle(length)))
rectilinear_focal_length = lambda radius: radius * math.tan(math.radians(90.0 - equidistant_angle(radius)))
rectilinear_focal_length_width = rectilinear_focal_length(gopro_sensor_width * 0.5)
rectilinear_focal_length_height = rectilinear_focal_length(gopro_sensor_height * 0.5)
rectilinear_focal_length_diagonal = rectilinear_focal_length(gopro_sensor_diagonal * 0.5)
rectilinear_focal_length_horizontal = rectilinear_focal_length(gopro_radius_horizontal)
rectilinear_focal_length_vertical = rectilinear_focal_length(gopro_radius_vertical)
rectilinear_focal_length_diagonal = rectilinear_focal_length(gopro_radius_diagonal)
print("rectilinear focal length: width = %.6f, height = %.6f, diagonal = %.6f" % (
rectilinear_focal_length_width,
rectilinear_focal_length_height,
print("linear focal: horizontal = %7.3f, vertical = %7.3f, diagonal = %7.3f (mm)" % (
rectilinear_focal_length_horizontal,
rectilinear_focal_length_vertical,
rectilinear_focal_length_diagonal))
rectilinear_radius = lambda angle, focal_length: focal_length * math.tan(math.radians(angle))
rectilinear_angle = lambda radius, focal_length: math.degrees(math.atan(radius / focal_length))
preserved_fov_horizontal = 2.0 * rectilinear_angle(gopro_radius_horizontal, rectilinear_focal_length_vertical)
preserved_fov_vertical = 2.0 * rectilinear_angle(gopro_radius_vertical, rectilinear_focal_length_vertical)
preserved_fov_diagonal = 2.0 * rectilinear_angle(gopro_radius_diagonal, rectilinear_focal_length_vertical)
print("linear fov : horizontal = %7.3f, vertical = %7.3f, diagonal = %7.3f (deg)" % (
preserved_fov_horizontal,
preserved_fov_vertical,
preserved_fov_diagonal))
print("\n--- shader parameters ---\n")
rectilinear_angle_horizontal = rectilinear_angle(gopro_radius_horizontal, rectilinear_focal_length_horizontal)
preserved_radius_horizontal = rectilinear_radius(rectilinear_angle_horizontal, rectilinear_focal_length_vertical)
pixel_scale = gopro_radius_horizontal / preserved_radius_horizontal
print("""// parameters
const vec2 sensor_size = vec2(%.6f, %.6f);
const vec2 pixel_scale = vec2(%.6f, 1.0);
const float equidistant_focal_length = %.6f;
const float rectilinear_focal_length = %.6f;
""" % (
gopro_size_horizontal, gopro_size_vertical,
pixel_scale,
gopro_focal_length,
rectilinear_focal_length_vertical)
)