位图转换为太 [英] Convert Bitmap to Mat

问题描述

我要Gdiplus ::位图转换为CV ::地图格式。
我使用这个code要做到这一点：

I need to convert Gdiplus::Bitmap to cv::Map format. I'm using this code to do this:

Gdiplus::Bitmap* enhanced = ...; // some Bitmap
Gdiplus::BitmapData bmp_data = {};
Gdiplus::Rect rect(0, 0, enhanced->GetWidth(), enhanced->GetHeight());

enhanced->LockBits(&rect, Gdiplus::ImageLockModeRead, enhanced->GetPixelFormat(), &bmp_data);

Mat imageMap(enhanced->GetHeight(), enhanced->GetWidth(), CV_8UC3, bmp_data.Scan0, std::abs(bmp_data.Stride)); // construct Map from Bitmap data. The problem is probably here

cvNamedWindow("w", 1);
cvShowImage("w", &imageMap); // runtime error (access violation)
cvWaitKey(0);

我有一个运行时错误，因为的图像映射的不正确构造。我在做什么错在这里？我会gratefull你的解释。

I have an runtime error, as imageMap wasn't properly constructed. What am I doing wrong here? I will be gratefull for your explanation.

推荐答案

如果你从你的位图构建简历::垫，你将不得不使用

if you're constructing a cv::Mat from your Bitmap, you will have to use

cv::imshow("w", imageMap);

要画它。

再次，简历的地址::垫是不一样的作为的IplImage *通过cvShowImage（）要求;

again, the address of a cv::Mat is not the same as an IplImage* required by cvShowImage();

（顺便说一句，你应该摆脱所有其他德precated C-API的调用，也。）

(btw, you should get rid of all other deprecated c-api calls, too.)

也小心一点，一个垫构造你的方式，拥有的借的指针像素。

also, be a bit careful, a Mat constructed the way you do, has a borrowed pointer to the pixels.

我不知道有关GDI +什么，但是如果指针超出范围或将失效，当你调用的增强型> UnlockRect（或它被称为），你需要做的。

i don't know anything about gdi+, but if that pointer goes out of scope or gets invalid when you call enhanced->UnlockRect (or what it was called), you will need to do

Mat safeImg = imageMap.clone();

要实现一个深的副本。

这篇关于位图转换为太的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！