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https://github.com/akai-katto/dandere2x.git
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104 lines
4.8 KiB
C++
104 lines
4.8 KiB
C++
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/*
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This file is part of the Dandere2x project.
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Dandere2x is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Dandere2x is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Foobar. If not, see <https://www.gnu.org/licenses/>.
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*/
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/*
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========= Copyright aka_katto 2018, All rights reserved. ============
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Original Author: aka_katto
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Date: 4/11/20
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Purpose:
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===================================================================== */
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#include "MSE_Function.h"
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//-----------------------------------------------------------------------------
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// Purpose: A simple square function which calculuates the "distance" or loss
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// between two colors.
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//-----------------------------------------------------------------------------
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bool MSE_FUNCTIONS::evaluate_implementation(const Frame ¤t_frame,
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const Frame &next_frame,
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const Frame &next_frame_compressed,
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const int current_frame_x, const int current_frame_y,
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const int next_frame_x, const int next_frame_y, const int block_size) {
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// todo: There's an unexpected (but working) behaviour that, while i'm passing the below arguments in
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// in reverse, (see how next_frame and current_frame_x are swapped), it preferoms correctly and well.
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// I'm not sure the origin of this bug, and suspect it may occur at a higher call, but chasing it down has
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// proven not fruitful. Please fix this when I get the time.
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double image_1_image_2_mse = MSE_FUNCTIONS::compute_mse(next_frame, current_frame,
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current_frame_x, current_frame_y, next_frame_x, next_frame_y,
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block_size);
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double image_2_image_2_compressed_mse = MSE_FUNCTIONS::compute_mse(next_frame, next_frame_compressed,
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next_frame_x, next_frame_y, next_frame_x, next_frame_y,
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block_size);
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if (image_1_image_2_mse <= image_2_image_2_compressed_mse) {
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return true;
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}
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return false;
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}
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//-----------------------------------------------------------------------------
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// Purpose: A simple square function which calculuates the "distance" or loss
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// between two colors.
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//-----------------------------------------------------------------------------
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int MSE_FUNCTIONS::square(const Frame::Color &color_a, const Frame::Color &color_b) {
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int r1 = (int) color_a.r;
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int r2 = (int) color_b.r;
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int g1 = (int) color_a.g;
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int g2 = (int) color_b.g;
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int b1 = (int) color_a.b;
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int b2 = (int) color_b.b;
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// Developer Note: We're using multiplication here and addition rather than POW
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// to avoid having to work with doubles for computational improvements.
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return (r2 - r1) * (r2 - r1) + (g2 - g1) * (g2 - g1) + (b2 - b1) * (b2 - b1);
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}
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//-----------------------------------------------------------------------------
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// Purpose: Compute MSE (Mean Squared Error) between two images at two different
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// blocks in their respective images. If the block is out of bounds,
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// returns INT_MAX (i.e, is the worst MSE possible)
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//-----------------------------------------------------------------------------
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double MSE_FUNCTIONS::compute_mse(const Frame &image_a, const Frame &image_b,
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const int image_a_x_start, const int image_a_y_start,
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const int image_b_x_start, const int image_b_y_start, const int block_size) {
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// Return a really large MSE if the two images are out of bounds (this is also to avoid causing 'sanity check'
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// within Frame from exiting the program).
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if (image_a.block_out_of_bounds(image_a_x_start, image_a_y_start, block_size) ||
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image_b.block_out_of_bounds(image_b_x_start, image_b_y_start, block_size))
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return INTMAX_MAX;
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// Compute the mse
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double sum = 0;
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for (int x = 0; x < block_size; x++)
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for (int y = 0; y < block_size; y++) {
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sum += square(image_a.get_color(image_a_x_start + x, image_a_y_start + y),
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image_b.get_color(image_b_x_start + x, image_b_y_start + y));
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}
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sum /= block_size * block_size;
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return sum;
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}
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