OpenCV imread（）在iOS上不返回任何图像数据 [英] OpenCV imread() returns no image data on iOS

问题描述

我正在尝试使用OpenCV的 imread（）函数在 cv :: Mat ，但它在iOS上失败（相同的代码适用于OS X）。返回的矩阵已分配且有效，但为空（即它不包含任何数据）。

I'm trying to use the OpenCV's imread() function to load a JPEG image in a cv::Mat, but it fails on iOS (the same code works on OS X). The returned matrix is allocated and valid, but empty (i.e. it contains no data).

执行函数 imread（）和 imwrite（）在iOS下工作？

Do the functions imread() and imwrite() work under iOS?

推荐答案

它有效，至少当你在正在运行的应用程序的Documents-Directory中保存和加载时。

It works, at least when you're saving and loading to and from the Documents-Directory of your running app.

//Creating Path to Documents-Directory
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"ocv%03d.BMP", picNum]];
const char* cPath = [filePath cStringUsingEncoding:NSMacOSRomanStringEncoding];

const cv::string newPaths = (const cv::string)cPath;

//Save as Bitmap to Documents-Directory
cv::imwrite(newPaths, frame);

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