OpenCV:更改深度和日志转换

Question

我正在尝试学习OpenCV,我想应用这个简单的公式:

这是一个每像素操作,并将像素从r转换为s.

这是我的代码:

int main(int /*argc*/, char** /*argv*/) {

    Mat _img = imread("lena.jpg"); 
    cvtColor(_img, img, CV_32F);

    cout << "original image size: " << img.rows << " " << img.cols << endl;
    cout << "original type: " << img.type() << endl;
    cout << "original depth: " << img.depth() << endl;

    Mat _src = img.clone();
    _src += 1;
    log(_src, logContrast);
    logContrast *= log_c;

    /// ...

我收到这个错误:

OpenCV Error: Assertion failed (depth == CV_32F || depth == CV_64F) in log, file /home/user/Documents/Code/OpenCV-2.3.1/modules/core/src/mathfuncs.cpp, line 1772
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/alberto/Documents/Code/OpenCV-2.3.1/modules/core/src/mathfuncs.cpp:1772: error: (-215) depth == CV_32F || depth == CV_64F in function log

我试着用灰色和彩色图像,并与cvtColor同CV_8U,CV_32F和C1,C3但我始终清点0作为深度 ..

我花了几个小时在OpenCV手册和OpenCV-2.3.1/modules/core/include/opencv2/core/types_c.h但是..我找不到解决方案.我想我对一个Mat物体的变换深度有一些混淆.

Answer 1

你确定你将图像转换为float32吗？

请查看下面的代码,我刚才写道.不知道输出是否正确,但它没有抛出任何错误.

#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>
using namespace std;

int main ()
{
    cv::Mat binary = cv::imread("kick.jpg",0);

    cv::Mat fg;
    binary.convertTo(fg,CV_32F);
    fg = fg + 1;
    cv::log(fg,fg);
    cv::convertScaleAbs(fg,fg);
    cv::normalize(fg,fg,0,255,cv::NORM_MINMAX);
    cv::imshow("a",fg);
cv::waitKey(0);
}

以下是我得到的输出: