matlab实现halcon illuminate算子

Halcon中的Illuminate算子用于计算一个区域是否被光线照亮并返回该区域的反射率。在Matlab中，可以通过以下代码实现类似的功能：

function [illuminated, reflectance] = illuminate(region, light_pos, image, threshold)
% region: 待检测的区域
% light_pos: 光源位置
% image: 图像
% threshold: 阈值

    % 获取区域的边界
    boundary = bwboundaries(region);
    boundary = boundary{1};

    % 计算区域的中心
    centroid = regionprops(region, 'centroid');
    centroid = centroid.Centroid;

    % 计算光线照射方向
    direction = [light_pos(1) - centroid(1), light_pos(2) - centroid(2)];

    % 计算光线照射强度和反射率
    intensity = 0;
    reflectance = 0;
    for i = 1:size(boundary, 1)
        pixel = boundary(i,:);
        intensity = intensity + image(pixel(1), pixel(2));
        reflectance = reflectance + dot(direction, gradient(double(image), pixel(2), pixel(1)));
    end
    intensity = intensity / size(boundary, 1);
    reflectance = reflectance / (size(boundary, 1) * norm(direction));

    % 判断是否被照亮
    illuminated = true;
    for i = 1:size(boundary, 1)
        pixel = boundary(i,:);
        value = image(pixel(1), pixel(2));
        if value < threshold * intensity
            illuminated = false;
            break;
        end
    end
end

该函数接受一个待检测的区域、光源位置、图像和阈值作为输入，返回该区域是否被光线照亮以及反射率。首先获取区域的边界和中心，计算光线照射方向、照射强度和反射率，然后判断区域是否被照亮。