diff options
Diffstat (limited to 'webp/lossy_nearlossless_gen_graph.m')
| -rwxr-xr-x | webp/lossy_nearlossless_gen_graph.m | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/webp/lossy_nearlossless_gen_graph.m b/webp/lossy_nearlossless_gen_graph.m new file mode 100755 index 0000000..cdc33a6 --- /dev/null +++ b/webp/lossy_nearlossless_gen_graph.m @@ -0,0 +1,44 @@ +#!/usr/bin/octave +% SPDX-FileCopyrightText: 2023 Brian Woods +% SPDX-License-Identifier: GPL-2.0-or-later + +graph_file = 'lossy_nearlossless_graph.png'; +img_dir = 'lossy_nearlossless_images/'; +varname = "nl"; +var_values = {'000', '010', '020', '030', ... + '040', '050', '060', '070', ... + '080', '090', '100'}; + +files = {strrep(strcat(img_dir, 'PNG_01-VARN_VAR.webp'), 'VARN', varname), ... + strrep(strcat(img_dir, 'PNG_02-VARN_VAR.webp'), 'VARN', varname), ... + strrep(strcat(img_dir, 'PNG_03-VARN_VAR.webp'), 'VARN', varname), ... + strrep(strcat(img_dir, 'PNG_04-VARN_VAR.webp'), 'VARN', varname)}; +files_len = length(files); +var_values_len = length(var_values); +results = zeros(files_len, var_values_len); + +for i = 1:files_len + for j = 1:var_values_len; + filepath = strrep(files{i}, 'VAR', var_values{j}); + [file, ~, ~] = stat(filepath); + results(i,j) = file.size; + end +end + +% normalize +for i = 1:files_len + results(i,:) = results(i,:)/max(results(i,:)); +end + +var_values_idx = str2double(var_values); +f = figure('visible','off'); +plot(var_values_idx, results(1,:),"b-"); +hold on; +plot(var_values_idx, results(2,:), "g-"); +plot(var_values_idx, results(3,:), "r-"); +plot(var_values_idx, results(4,:), "c-"); +xlabel ("near lossless preprocessing (0 is more visual compression)"); +ylabel ("normalized file size"); +h = legend ("PNG 01", "PNG 02", "PNG 03", "PNG 04"); +legend(h, "location", "northeastoutside"); +print(graph_file); |