来自相机的原始图像数据 [英] Raw image data from camera

问题描述

我一直在这个论坛上下搜索，但我找不到我真正需要的。我想从相机获得原始图像数据。到目前为止，我试图从该方法 captureStillImageAsynchronouslyFromConnection：completionHandler：获取数据，并写入到 NSData 中的imageDataSampleBuffer $ c> object，但是没有工作。
也许我在错误的轨道，也许我只是做错了。
我不想要的是以任何方式压缩图像。

简单的方法是使用 jpegStillImageNSDataRepresentation：从 AVCaptureStillImageOutput

解决方案

这是我怎么做的：

1：我首先打开相机：

$ b b

   - （void）openCamera 
 {
 imagePicker = [[UIImagePickerController alloc] init]; 
 imagePicker.delegate = self; 
 
 if（[UIImagePickerController isSourceTypeAvailable：UIImagePickerControllerSourceTypeCamera]）
 {
 imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera; 
 imagePicker.mediaTypes = [NSArray arrayWithObjects：
（NSString *）kUTTypeImage，
（NSString *）kUTTypeMovie，nil]; 
 imagePicker.allowsEditing = NO; 
 
 [self presentModalViewController：imagePicker animated：YES]; 
} 
 else {
 lblError.text = NSLocalizedStringFromTable（@noCameraFound，@Errors，@）; 
} 
} 
  

当拍摄照片时， / p>

   - （void）imagePickerController：（UIImagePickerController *）picker didFinishPickingMediaWithInfo：（NSDictionary *）info {
 // Save and获取图像的路径
 NSString * mediaType = [info objectForKey：UIImagePickerControllerMediaType]; 
 ALAssetsLibrary * library = [[ALAssetsLibrary alloc] init]; 
 if（[mediaType isEqualToString：（NSString *）kUTTypeImage]）
 {
 //保存图片
 image = [info objectForKey：@UIImagePickerControllerOriginalImage]; 
 [library writeImageToSavedPhotosAlbum：[image CGImage] orientation：（ALAssetOrientation）[image imageOrientation] completionBlock：^（NSURL * assetURL，NSError * error）{
 if（！error）{
 //保存数据库的路径和位置
 NSString * pathLocation = [[NSString alloc] initWithFormat：@％@，assetURL]; 
} else {
 NSLog（@CameraViewController：Error on saving image：％@ {imagePickerController}，error）; 
} 
}]; 
 
} 
 [imagePicker dismissModalViewControllerAnimated：YES]; 
} 
  

然后使用该路径从库中获取完整分辨率的图片（1））：

   - （void）preparePicture：（NSString *）filePathPicture {
 ALAssetsLibraryAssetForURLResultBlock resultBlock = （ALAsset * myasset）
 {
 if（myasset！= nil）{
 ALAssetRepresentation * assetRep = [myasset defaultRepresentation]; 
 CGImageRef imageRef = [assetRep fullResolutionImage]; 
 if（imageRef）{
 NSData * imageData = UIImageJPEGRepresentation（[UIImage imageWithCGImage：imageRef]，1）; 
} 
} else {
 //错误
} 
}; 
 
 ALAssetsLibraryAccessFailureBlock failureBlock = ^（NSError * error）
 {
 NSString * errorString = [NSString stringWithFormat：@无法获取图像，％@，[错误localizedDescription] ]; 
 NSLog（@％@，errorString）; 
}; 
 
 if（filePathPicture&& [filePathPicture length]）
 {
 NSURL * assetUrl = [NSURL URLWithString：filePathPicture]; 
 ALAssetsLibrary * assetslibrary = [[ALAssetsLibrary alloc] init]; 
 [assetslibrary assetForURL：assetUrl 
 resultBlock：resultBlock 
 failureBlock：failureBlock]; 
} 
} 
  

希望这有助于你更进一步:-)。

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.

The easy way is to use jpegStillImageNSDataRepresentation: from AVCaptureStillImageOutput, but like I said I don't want it to be compressed.

Thanks!

解决方案

This is how i do it:

1: I first open the camera using:

- (void)openCamera
{
    imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.delegate = self;

    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
    {        
        imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
        imagePicker.mediaTypes = [NSArray arrayWithObjects:
                              (NSString *) kUTTypeImage,
                              (NSString *) kUTTypeMovie, nil];
        imagePicker.allowsEditing = NO;

        [self presentModalViewController:imagePicker animated:YES];
    }
    else {
        lblError.text = NSLocalizedStringFromTable(@"noCameraFound", @"Errors", @"");  
    }
}

When the picture is taken this method gets called:

 -(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    // Save and get the path of the image
    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
    if([mediaType isEqualToString:(NSString *)kUTTypeImage]) 
    {
        // Save the image
        image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
        [library writeImageToSavedPhotosAlbum:[image CGImage] orientation:(ALAssetOrientation)[image imageOrientation] completionBlock:^(NSURL *assetURL, NSError *error){
            if(!error) {
               //Save path and location to database
               NSString *pathLocation = [[NSString alloc] initWithFormat:@"%@", assetURL];
            } else {
                NSLog(@"CameraViewController: Error on saving image : %@ {imagePickerController}", error);
            }
        }];

    }
    [imagePicker dismissModalViewControllerAnimated:YES];
}

Then with that path i get the picture from the library in FULL resolution (using the "1"):

 -(void)preparePicture: (NSString *) filePathPicture{
    ALAssetsLibraryAssetForURLResultBlock resultBlock = ^(ALAsset *myasset)
    {
        if(myasset != nil){
            ALAssetRepresentation *assetRep = [myasset defaultRepresentation];
            CGImageRef imageRef = [assetRep fullResolutionImage];
            if (imageRef) {
                NSData *imageData = UIImageJPEGRepresentation([UIImage imageWithCGImage:imageRef], 1);
            }
        }else {
            //error
        }
     };

    ALAssetsLibraryAccessFailureBlock failureBlock  = ^(NSError *error)
    {      
         NSString *errorString = [NSString stringWithFormat:@"can't get image, %@",[error localizedDescription]];
        NSLog(@"%@", errorString);
    };

     if(filePathPicture && [filePathPicture length])
     {
         NSURL *assetUrl = [NSURL URLWithString:filePathPicture];
         ALAssetsLibrary *assetslibrary = [[ALAssetsLibrary alloc] init];
        [assetslibrary assetForURL:assetUrl 
                   resultBlock:resultBlock
                  failureBlock:failureBlock];
    }
}

Hope this helps you a bit further :-).

这篇关于来自相机的原始图像数据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！