c語言數字影象處理(二):圖片放大與縮小-雙線性內插法
阿新 • • 發佈:2018-12-10
int is_in_array(short x, short y, short height, short width) { if (x >= 0 && x < width && y >= 0 && y < height) return 1; else return 0; } void bilinera_interpolation(short** in_array, short height, short width, short** out_array, short out_height, short out_width) { double h_times = (double)out_height / (double)height, w_times = (double)out_width / (double)width; short x1, y1, x2, y2, f11, f12, f21, f22; double x, y; for (int i = 0; i < out_height; i++){ for (int j = 0; j < out_width; j++){ x= j / w_times; y = i / h_times; x1 = (short)(x - 1); x2 = (short)(x + 1); y1 = (short)(y + 1); y2 = (short)(y - 1); f11 = is_in_array(x1, y1, height, width) ? in_array[y1][x1] : 0; f12 = is_in_array(x1, y2, height, width) ? in_array[y2][x1] : 0; f21 = is_in_array(x2, y1, height, width) ? in_array[y1][x2] : 0; f22 = is_in_array(x2, y2, height, width) ? in_array[y2][x2] : 0; out_array[i][j] = (short)(((f11 * (x2 - x) * (y2 - y)) + (f21 * (x - x1) * (y2 - y)) + (f12 * (x2 - x) * (y - y1)) + (f22 * (x - x1) * (y - y1))) / ((x2 - x1) * (y2 - y1))); } } }