// 极值点评分 void Caliper::ExtremePointRating() { if(extremePoints.empty()) return; // 评分： value * (1 - |i - 0.5 * le| / 0.5 * len) int halfLen = static_cast<int>(path.size() / 2); for(auto& e: extremePoints) { e.score = e.value * (1 - static_cast<double>(std::abs(e.ps - halfLen)) / halfLen); } //按评分排序：降序 sort(extremePoints.begin(), extremePoints.end(), CompareExtremPointInfoBysocre); result.peak = extremePoints.at(0).pt; if(extremePoints.size() == 1) { result.center = result.front = result.back = extremePoints.at(0).pt; return; } if(extremePoints.size() == 2) { int a = std::abs(extremePoints.at(0).ps - halfLen); int b = std::abs(extremePoints.at(1).ps - halfLen); if(a > b) { result.front = result.back = extremePoints.at(0).pt; result.center = extremePoints.at(1).pt; }else { } }else { std::vector<ExtremPointInfo> epf(extremePoints.begin(), extremePoints.begin() + 3); sort(epf.begin(), epf.end(), CompareExtremPointInfoByPs);//降序 result.back = epf.at(0).pt; result.center = epf.at(1).pt; result.front = epf.at(2).pt; } }

这段代码看起来是C++，它是用来进行极值点评分的。这个函数首先检查是否存在极值点，如果没有则直接返回。接着，对每个极值点进行评分，评分的公式为 value * (1 - |i - 0.5 * le| / 0.5 * len)，其中 value 为极值点的数值，i 为极值点在整个路径上的位置，le 为路径的长度，len 为路径长度的一半。评分后，将所有极值点按照评分从高到低排序。然后根据极值点的数量，分别处理三种情况：如果只有一个极值点，则将其作为 peak、front、back 和 center；如果有两个极值点，则将评分较高的作为 center，评分较低的作为 front 和 back；如果有三个或更多极值点，则取评分最高的作为 back，评分第二高的作为 center，评分第三高的作为 front。最后将结果保存在 result 结构体中。

相关问题

// 极值点评分 void Caliper::ExtremePointRating() { if(extremePoints.empty()) return; // 评分： value * (1 - |i - 0.5 * le| / 0.5 * len) int halfLen = static_cast<int>(path.size() / 2); for(auto& e: extremePoints) { e.score = e.value * (1 - static_cast<double>(std::abs(e.ps - halfLen)) / halfLen); } //按评分排序：降序 sort(extremePoints.begin(), extremePoints.end(), CompareExtremPointInfoBysocre); result.peak = extremePoints.at(0).pt; if(extremePoints.size() == 1) { result.center = result.front = result.back = extremePoints.at(0).pt; return; } if(extremePoints.size() == 2) { int a = std::abs(extremePoints.at(0).ps - halfLen); int b = std::abs(extremePoints.at(1).ps - halfLen); if(a > b) { result.front = result.back = extremePoints.at(0).pt; result.center = extremePoints.at(1).pt; }else { } }else { std::vector<ExtremPointInfo> epf(extremePoints.begin(), extremePoints.begin() + 3); sort(epf.begin(), epf.end(), CompareExtremPointInfoByPs);//降序 result.back = epf.at(0).pt; result.center = epf.at(1).pt; result.front = epf.at(2).pt; } }//ExtremePointRating 基于opencvsharp4.6 请优化代码,生成新的函数

为了优化代码，可以考虑以下几个方面：

1. 减少不必要的类型转换

在原有代码中，存在如下的类型转换：

int halfLen = static_cast<int>(path.size() / 2);

可以改为使用整数除法运算符 `/`，避免类型转换的开销：

int halfLen = path.size() / 2;

2. 避免不必要的容器复制

在原有代码中，存在如下的容器复制操作：

std::vector<ExtremPointInfo> epf(extremePoints.begin(), extremePoints.begin() + 3);

可以改为直接使用 `std::array`，避免不必要的容器复制：

std::array<ExtremPointInfo, 3> epf = {extremePoints[0], extremePoints[1], extremePoints[2]};

3. 使用 lambda 表达式简化代码

在原有代码中，使用了函数指针作为 `sort` 函数的比较函数：

sort(extremePoints.begin(), extremePoints.end(), CompareExtremPointInfoBysocre);
sort(epf.begin(), epf.end(), CompareExtremPointInfoByPs);

可以改为使用 lambda 表达式，使代码更加简洁：

sort(extremePoints.begin(), extremePoints.end(), [](const ExtremPointInfo& a, const ExtremPointInfo& b) { return a.score > b.score; });
sort(epf.begin(), epf.end(), [](const ExtremPointInfo& a, const ExtremPointInfo& b) { return a.ps > b.ps; });

基于以上优化，可以得到如下的新函数：

void Caliper::ExtremePointRatingOptimized()
{
    if (extremePoints.empty())
        return;

    // 评分： value * (1 - |i - 0.5 * le| / 0.5 * len)
    int halfLen = path.size() / 2;
    for (auto& e : extremePoints)
    {
        e.score = e.value * (1 - static_cast<double>(std::abs(e.ps - halfLen)) / halfLen);
    }

    // 按评分排序：降序
    sort(extremePoints.begin(), extremePoints.end(), [](const ExtremPointInfo& a, const ExtremPointInfo& b) { return a.score > b.score; });

    result.peak = extremePoints[0].pt;

    if (extremePoints.size() == 1)
    {
        result.center = result.front = result.back = extremePoints[0].pt;
        return;
    }

    if (extremePoints.size() == 2)
    {
        int a = std::abs(extremePoints[0].ps - halfLen);
        int b = std::abs(extremePoints[1].ps - halfLen);
        if (a > b)
        {
            result.front = result.back = extremePoints[0].pt;
            result.center = extremePoints[1].pt;
        }
        else
        {
            result.front = result.back = extremePoints[1].pt;
            result.center = extremePoints[0].pt;
        }
    }
    else
    {
        std::array<ExtremPointInfo, 3> epf = {extremePoints[0], extremePoints[1], extremePoints[2]};
        // 降序
        sort(epf.begin(), epf.end(), [](const ExtremPointInfo& a, const ExtremPointInfo& b) { return a.ps > b.ps; });

        result.back = epf[0].pt;
        result.center = epf[1].pt;
        result.front = epf[2].pt;
    }
}

OpenCvSharp4.6 编写的 C# 代码版本 // 求取极值点 void Caliper::FindExtremePoint() { // 1. 检查搜索路径像素数据是否为空 if(pathPixelValueAfterFilter.empty()) return; // 2. 遍历滤波后的数据，查找极值点 extremePoints.clear(); switch (polarity) { // 不考虑极性 case 0 : for(size_t i = 1; i < pathPixelValueAfterFilter.size() - 1; ++i) { // 两边异号为极值点 if (size_t(std::abs(pathPixelValueAfterFilter.at(i))) >= contrastThreshold && (0 > (pathPixelValueAfterFilter.at(i) - pathPixelValueAfterFilter.at(i - 1)) * (pathPixelValueAfterFilter.at(i + 1) - pathPixelValueAfterFilter.at(i))) ) { extremePoints.push_back(ExtremPointInfo(path.at(i), static_cast<int>(i), static_cast<int>(pathPixelValueAfterFilter.at(i)))); } } break; // 黑到白 case 1 : for(size_t i = 1; i < pathPixelValueAfterFilter.size() - 1; ++i) { // 两边异号为极值点 if (pathPixelValueAfterFilter.at(i) > 0 && size_t(std::abs(pathPixelValueAfterFilter.at(i))) >= contrastThreshold && (0 > (pathPixelValueAfterFilter.at(i) - pathPixelValueAfterFilter.at(i - 1)) * (pathPixelValueAfterFilter.at(i + 1) - pathPixelValueAfterFilter.at(i))) ) { extremePoints.push_back(ExtremPointInfo(path.at(i), static_cast<int>(i), static_cast<int>(pathPixelValueAfterFilter.at(i)))); } } break; // 白到黑 case -1: for(size_t i = 1; i < pathPixelValueAfterFilter.size() - 1; ++i) { // 两边异号为极值点 if (pathPixelValueAfterFilter.at(i) < 0 && size_t(std::abs(pathPixelValueAfterFilter.at(i))) >= contrastThreshold && (0 > (pathPixelValueAfterFilter.at(i) - pathPixelValueAfterFilter.at(i - 1)) * (pathPixelValueAfterFilter.at(i + 1) - pathPixelValueAfterFilter.at(i))) ) { extremePoints.push_back(ExtremPointInfo(path.at(i), static_cast<int>(i), static_cast<int>(pathPixelValueAfterFilter.at(i)))); } } break; default: assert(false); break; }

这段代码是用于在图像中搜索极值点的，主要包括以下步骤：

1. 检查搜索路径像素数据是否为空；

2. 遍历滤波后的数据，查找极值点；

3. 根据极性类型分别处理不同的情况，包括不考虑极性、黑到白和白到黑；

4. 找到极值点后将其信息保存到 `extremePoints` 中。

其中，`pathPixelValueAfterFilter` 是经过滤波后的搜索路径像素数据，`contrastThreshold` 是对比度的阈值，`path` 是搜索路径的像素坐标，`polarity` 是极性类型。