OPENCV中直方图的归一化

Question

我在 OpenCV 项目期间遇到有关规范化过程的问题。我应该使用的函数叫做cvNormalizeHist，但是我不知道如何直接在代码中使用它。

C: void cvNormalizeHist(CvHistogram* hist, double factor)

Parameters: 
    hist – Pointer to the histogram.
    factor – Normalization factor.

The function normalizes the histogram bins by scaling them so that the sum of the bins becomes equal to factor.

我想做的是：

#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>
#include <stdio.h>

using namespace std;
using namespace cv;

int main(int argc, char** argv)
{
    Mat src, dst;

    /// Load image
    src = imread(argv[1], 1);

    if (!src.data)
    {
        return -1;
    }

    /// Separate the image in 3 places ( B, G and R )
    vector<Mat> bgr_planes;
    split(src, bgr_planes);

    /// Establish the number of bins
    int histSize = 256;

    /// Set the ranges ( for B,G,R) )
    float range[] = { 0, 256 };
    const float* histRange = { range };

    bool uniform = true; 
    bool accumulate = false;

    Mat b_hist, g_hist, r_hist;

    /// Compute the histograms:
    calcHist(&bgr_planes[0], 1, 0, Mat(), b_hist, 1, &histSize, &histRange, uniform, accumulate);
    calcHist(&bgr_planes[1], 1, 0, Mat(), g_hist, 1, &histSize, &histRange, uniform, accumulate);
    calcHist(&bgr_planes[2], 1, 0, Mat(), r_hist, 1, &histSize, &histRange, uniform, accumulate);

    cvNormalizeHist(b_hist, 5); // (1)

    CvHistogram histogram(); // (2)
    ...

    waitKey(0);

    return 0;
}

我正在尝试使用这样的函数，但是错误提示我应该使用 CvHistogram 而不是 Mat 对象。而且我不知道如何在这些对象之间进行转换。

任何人都可以给我如何做或任何建议？

更多可能有用的信息是： Windows 10，Visual Studio 2013，OpenCV 3.0

此致

Answer 1

您应该避免使用过时的 C 函数。

您可以使用 normalize，其中 alpha 等于您的因数，NORM_L1。

例如：

double factor = 25;
normalize(b_hist, b_hist, factor, 0, NORM_L1);

cout << sum(b_hist)[0];

您会看到 bin 的总和等于因子。

OPENCV中直方图的归一化

Normalization of histogram in OPENCV

normalization

histogram

opencv3.0