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