为什么使用OpenCV的cvLoadImage总是在IOS上返回NULL？

Question

我写了一些代码在iPad上运行，我使用cvLoadImage（）从Bundle Resources读取图像，但它总是返回NULL ，我不知道为什么？

Answer 1

You can't load an image from your app bundle directly into OpenCV … Getting a proper cv::Mat involves two steps:

1.) Load your image using UIImage
2.) Convert the UIImage to a cv::Mat

Which looks like this:

cv::Mat img = [UIImageCVMatConverter cvMatFromUIImage:[UIImage imageNamed:@"my_image.png"]];

Grab the UIImageCVMatConverter class from this thread: OpenCV install in xcode

Hope that helps!

Answer 2

use directly

[UIImage imageWithNamed:@"photo.png"];

if the image is in Bundle you can use directly.