int energy(Pixel** image, int column, int row, int width, int height) {
// TODO(student): compute the energy of a pixel
INFO(image);
INFO(column);
INFO(row);
INFO(width);
INFO(height);
int energy = 0;
int energy_col = 0;
int energy_row = 0;
int right_col = 0;
int right_row = 0;
int left_col = 0;
int left_row = 0;
int up_col = 0;
int up_row = 0;
int down_col = 0;
int down_row = 0;
int h_red = 0;
int h_green = 0;
int h_blue = 0;
int v_red = 0;
int v_green = 0;
int v_blue = 0;
if (width == 1 && height == 1)
return 0;
if (column + 1 == width) {
right_col = 0;
right_row = row;
left_col = column - 1;
left_row = row;
}
else if (column == 0) {
right_col = column + 1;
right_row = row;
left_col = width - 1;
left_row = row;
}
else {
right_col = column + 1;
right_row = row;
left_col = column - 1;
left_row = row;
}
h_red = image[right_col][right_row].r - image[left_col][left_row].r;
h_green = image[right_col][right_row].g - image[left_col][left_row].g;
h_blue = image[right_col][right_row].b - image[left_col][left_row].b;
energy_col = (h_red * h_red) + (h_green * h_green) + (h_blue * h_blue);
if (row + 1 == height) {
down_col = column;
down_row = 0;
up_col = column;
up_row = row - 1;
}
else if (row == 0) {
down_col = column;
down_row = row + 1;
up_col = column;
up_row = height - 1;
}
else {
down_col = column;
down_row = row + 1;
up_col = column;
up_row = row - 1;
}
v_red = image[down_col][down_row].r - image[up_col][up_row].r;
v_green = image[down_col][down_row].g - image[up_col][up_row].g;
v_blue = image[down_col][down_row].b - image[up_col][up_row].b;
energy_row = v_red * v_red + v_green * v_green + v_blue * v_blue;
energy = energy_col + energy_row;
return energy;
}
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