来自像“645 PRO"这样的相机的原始图像数据 [英] Raw image data from camera like "645 PRO"
问题描述
前段时间我已经问过这个问题，我也得到了很好的答案:
A time ago I already asked this question and I also got a good answer:
我一直在这个论坛上下搜索，但我找不到我想要的真的需要.我想从相机获取原始图像数据.至目前为止我试图从 imageDataSampleBuffer 中获取数据方法captureStillImageAsynchronouslyFromConnection:completionHandler: 和将其写入 NSData 对象，但这不起作用.也许我在走错路了，或者我只是做错了.我不想要的是以任何方式压缩图像.
I've been searching this forum up and down but I couldn't find what I really need. I want to get raw image data from the camera. Up till now I tried to get the data out of the imageDataSampleBuffer from that method captureStillImageAsynchronouslyFromConnection:completionHandler: and to write it to an NSData object, but that didn't work. Maybe I'm on the wrong track or maybe I'm just doing it wrong. What I don't want is for the image to be compressed in any way.
最简单的方法是使用 jpegStillImageNSDataRepresentation: fromAVCaptureStillImageOutput，但就像我说的我不希望它是压缩.
The easy way is to use jpegStillImageNSDataRepresentation: from AVCaptureStillImageOutput, but like I said I don't want it to be compressed.
谢谢！
我以为我可以使用它，但我终于注意到我需要以类似于在645 PRO"中完成的方式更直接地获取原始图像数据.
I thought I could work with this, but I finally noticed that I need to get raw image data more directly in a similar way as it is done in "645 PRO".
该站点上的图片显示，他们在完成任何 jpeg 压缩之前获得了原始数据.这就是我想要做的.我的猜测是我需要转换 imageDataSampleBuffer 但我没有看到完全没有压缩的方法.645 PRO"也将它的图片保存在 TIFF 中，所以我认为它至少使用了一个额外的库.
The pictures on that site show that they get the raw data before any jpeg compression is done. That is what I want to do. My guess is that I need to transform imageDataSampleBuffer but I don't see a way to do it completely without compression.
"645 PRO" also saves its pictures in TIFF so I think it uses at least one additional library.
我不想制作照片应用，但我需要最好的质量来检查图片中的某些功能.
I don't want to make a photo app but I need the best quality I get to check for certain features in a picture.
谢谢！
编辑 1:因此，在尝试并在不同方向上搜索了一段时间后，我决定提供状态更新.
Edit 1: So after trying and searching in different directions for a while now I decided to give a status update.
这个项目的最终目标是检查图片中的某些特征，这将在 opencv 的帮助下发生.但是，在该应用能够在手机上执行此操作之前，我会尝试从手机中获取大部分未压缩的图片，以便在计算机上对其进行分析.
The final goal of this project is to check for certain features in a picture which will happen with the help of opencv. But until the app is able to do it on the phone I'm trying to get mostly uncompressed pictures out of the phone to analyse them on the computer.
因此，我想保存包含从相机返回的未压缩 BGRA 字节的 NSData 实例"，我可以使用 Brad Larson 的代码将其保存为 bmp 或 TIFF 文件.正如我在评论中所说，我尝试为此使用 opencv(无论如何都需要它).但我能做的最好的事情就是把它变成一个带有来自 计算机视觉讲座.
Therefore I want to save the "NSData instance containing the uncompressed BGRA bytes returned from the camera" I'm able to get with Brad Larson's code as bmp or TIFF file. As I said in a comment I tried using opencv for this (it will be needed anyway). But the best I could do was turning it into a UIImage with a function from Computer Vision Talks.
void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);
cv::Mat frame(height, width, CV_8UC4, (void*)baseAddress);
UIImage *testImag = [UIImage imageWithMat:frame andImageOrientation:UIImageOrientationUp];
//imageWithMat... being the function from Computer Vision Talks which I can post if someone wants to see it
ImageMagick - 方法
我尝试的另一件事是按照 另一篇文章中的建议使用 ImageMagick/a>.但如果不使用 UIImagePNGRepresentation 或 UIImageJPEGRepresentation 之类的东西，我找不到办法做到这一点.
Another thing I tried was using ImageMagick as suggested in another post.
But I couldn't find a way to do it without using something like UIImagePNGRepresentationor UIImageJPEGRepresentation.
现在我正在尝试使用这个 教程对 libtiff 做一些事情.
For now I'm trying to do something with libtiff using this tutorial.
也许有人有想法或知道一种更简单的方法来将我的缓冲区对象转换为未压缩的图片.再次提前致谢！
Maybe someone has an idea or knows a much easier way to convert my buffer object into an uncompressed picture. Thanks in advance again!
编辑 2:
我发现了一些东西！而且我必须说我非常失明.
I found something! And I must say I was very blind.
void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);
cv::Mat frame(height, width, CV_8UC4, (void*)baseAddress);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"ocv%d.TIFF", picNum]];
const char* cPath = [filePath cStringUsingEncoding:NSMacOSRomanStringEncoding];
const cv::string newPaths = (const cv::string)cPath;
cv::imwrite(newPaths, frame);
我只需要使用 opencv 中的 imwrite 函数.这样我就可以在拜尔极化后直接获得大约 30 MB 的 TIFF 文件！
I just have to use the imwrite function from opencv. This way I get TIFF-files around 30 MB directly after the beyer-Polarisation!
推荐答案
我可以用 OpenCV 解决.感谢所有帮助过我的人.
I could solve it with OpenCV. Thanks to everyone who helped me.
void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);
cv::Mat frame(height, width, CV_8UC4, (void*)baseAddress);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"ocv%d.BMP", picNum]];
const char* cPath = [filePath cStringUsingEncoding:NSMacOSRomanStringEncoding];
const cv::string newPaths = (const cv::string)cPath;
cv::imwrite(newPaths, frame);
我只需要使用 opencv 中的 imwrite 函数.这样我就在 bayer-filter 之后直接获得了大约 24 MB 的 BMP 文件！
I just have to use the imwrite function from opencv. This way I get BMP-files around 24 MB directly after the bayer-filter!
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