78 lines
1.9 KiB
Mathematica
78 lines
1.9 KiB
Mathematica
|
% -- weston_plot_rgb_diff_stat (fname)
|
||
|
|
% -- weston_plot_rgb_diff_stat (fname, scale)
|
||
|
|
% -- weston_plot_rgb_diff_stat (fname, scale, x_column)
|
||
|
|
% Plot an rgb_diff_stat dump file
|
||
|
|
%
|
||
|
|
% Creates a new figure and draws four sub-plots: R difference,
|
||
|
|
% G difference, B difference, and two-norm error.
|
||
|
|
%
|
||
|
|
% Scale defaults to 255. It is used to multiply both x and y values
|
||
|
|
% in all plots. Note that R, G and B plots will contain horizontal lines
|
||
|
|
% at y = +/- 0.5 to help you see the optimal rounding error range for
|
||
|
|
% the integer encoding [0, scale]. Two-norm plot contains a horizontal
|
||
|
|
% line at y = sqrt(0.75) which represents an error sphere with the radius
|
||
|
|
% equal to the two-norm of RGB error (0.5, 0.5, 0.5).
|
||
|
|
%
|
||
|
|
% By default, x-axis is sample index, not multiplied by scale. If
|
||
|
|
% x_column is given, it is a column index in the dump file to be used as
|
||
|
|
% the x-axis values, multiplied by scale. Indices start from 1, not 0.
|
||
|
|
|
||
|
|
% SPDX-FileCopyrightText: 2022 Collabora, Ltd.
|
||
|
|
% SPDX-License-Identifier: MIT
|
||
|
|
|
||
|
|
function weston_plot_rgb_diff_stat(fname, scale, x_column);
|
||
|
|
|
||
|
|
S = load(fname);
|
||
|
|
|
||
|
|
if nargin < 2
|
||
|
|
scale = 255;
|
||
|
|
end
|
||
|
|
if nargin < 3
|
||
|
|
x = 1:size(S, 1);
|
||
|
|
else
|
||
|
|
x = S(:, x_column) .* scale;
|
||
|
|
end
|
||
|
|
|
||
|
|
x_lim = [min(x) max(x)];
|
||
|
|
|
||
|
|
evec = S(:, 1) .* scale; # two-norm error
|
||
|
|
rvec = S(:, 2) .* scale; # r diff
|
||
|
|
gvec = S(:, 3) .* scale; # g diff
|
||
|
|
bvec = S(:, 4) .* scale; # b diff
|
||
|
|
|
||
|
|
figure
|
||
|
|
|
||
|
|
subplot(4, 1, 1);
|
||
|
|
plot(x, rvec, 'r');
|
||
|
|
plus_minus_half_lines(x_lim);
|
||
|
|
title(fname, "Interpreter", "none");
|
||
|
|
ylabel('R diff');
|
||
|
|
axis("tight");
|
||
|
|
|
||
|
|
subplot(4, 1, 2);
|
||
|
|
plot(x, gvec, 'g');
|
||
|
|
plus_minus_half_lines(x_lim);
|
||
|
|
ylabel('G diff');
|
||
|
|
axis("tight");
|
||
|
|
|
||
|
|
subplot(4, 1, 3);
|
||
|
|
plot(x, bvec, 'b');
|
||
|
|
plus_minus_half_lines(x_lim);
|
||
|
|
ylabel('B diff');
|
||
|
|
axis("tight");
|
||
|
|
|
||
|
|
subplot(4, 1, 4);
|
||
|
|
plot(x, evec, 'k');
|
||
|
|
hold on;
|
||
|
|
plot(x_lim, [1 1] .* sqrt(0.75), 'k:');
|
||
|
|
ylabel('Two-norm');
|
||
|
|
axis("tight");
|
||
|
|
|
||
|
|
max_abs_err = [max(abs(rvec)) max(abs(gvec)) max(abs(bvec))]
|
||
|
|
|
||
|
|
function plus_minus_half_lines(x_lim);
|
||
|
|
|
||
|
|
hold on;
|
||
|
|
plot(x_lim, [0.5 -0.5; 0.5 -0.5], 'k:');
|
||
|
|
|