将Opencv imread()转换为Mat_< float> [英] Opencv imread() to Mat_<float>

问题描述

我正在程序中读取许多图像，并使用以下代码读取每个图像.

I was reading many images in my program and used following code to read each image.

cv::Mat_<float> LoadedImage = imread(filename, CV_LOAD_IMAGE_GRAYSCALE);

而且，它适用于某些图像，但不适用于所有图像. (图像均为JPG文件)

And, it works for some images but not for all images. (Images are all JPG files)

我使用VS 2010调试模式检查了结构，并且LoadedImage具有以下结构.

I checked structure with VS 2010 debug mode and LoadedImage has following structure.

结构http://imageshack.com/a/img838/451/5n17. png

以某种方式，行为零(但列是正确的).有人能向我解释原因吗? :)

Somehow rows are zero (But cols are correct). Is anyone able to explain to me why? :)

谢谢.

我正在放置当前正在使用的代码来避免此问题.但是我不确定为什么必须那样做.

I am putting code that I am currently using to avoid this issue. But I am not sure why that has to be done that way.

// Read image with imread() to Mat
cv::Mat LoadedImage_CharFormat = imread(fullfilename);  

// Convert to Gray image
if(LoadedImage_CharFormat.type() != CV_8UC1)
    cvtColor(LoadedImage_CharFormat, LoadedImage_CharFormat, CV_RGB2GRAY);

// Convert to Mat_<float> 
cv::Mat_<float> LoadedImage;
LoadedImage_CharFormat.convertTo(LoadedImage, CV_32F);

这是您可以尝试的图像. http://imagizer.imageshack.us/a/img845/4624/y8h0. jpg

Here is image that you can try. http://imagizer.imageshack.us/a/img845/4624/y8h0.jpg

推荐答案

您无法将灰度(uchar)图像直接读取到浮动垫中.

you can't read a grayscale(uchar) image directly into a float Mat. instead,

Mat m = imread("image.jpg",0);
Mat_<float> fm;

m.convertTo(fm,CV_32F);

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