用MATLAB写一段蒙特卡洛场景削减代码

以下是一个简单的蒙特卡洛场景削减代码，用MATLAB编写：

% 定义场景削减的函数
function [reduced_scene] = monte_carlo_reduction(scene, reduction_factor)
% 计算需要保留的像素数
num_pixels = size(scene, 1) * size(scene, 2);
num_pixels_to_keep = round(num_pixels * reduction_factor);

% 将场景转换为向量形式
scene_vector = reshape(scene, [], 3);

% 通过蒙特卡洛采样，随机选择需要保留的像素
keep_indices = randperm(num_pixels, num_pixels_to_keep);

% 根据保留的像素索引，对场景进行削减
reduced_scene_vector = scene_vector(keep_indices, :);
reduced_scene = reshape(reduced_scene_vector, size(scene, 1), size(scene, 2), []);
end

% 示例用法
% 加载场景图像
scene = imread('scene.jpg');

% 将图像转换为double类型
scene = im2double(scene);

% 对场景进行削减
reduction_factor = 0.5; % 保留50%的像素
reduced_scene = monte_carlo_reduction(scene, reduction_factor);

% 显示原始场景和削减后的场景
figure;
subplot(1, 2, 1);
imshow(scene);
title('Original Scene');
subplot(1, 2, 2);
imshow(reduced_scene);
title(sprintf('Reduced Scene (%d%%)', reduction_factor * 100));