4

我一直在搜索这个论坛，但我找不到我真正需要的东西。我想从相机获取原始图像数据。到目前为止，我试图从该方法中从 imageDataSampleBuffer 中获取数据 captureStillImageAsynchronouslyFromConnection:completionHandler: 并将其写入一个NSData对象，但这不起作用。也许我走错了路，或者我只是做错了。我不想要以任何方式压缩图像。

简单的方法是使用jpegStillImageNSDataRepresentation: from AVCaptureStillImageOutput，但就像我说的那样，我不希望它被压缩。

谢谢！

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1 回答 1

5

我就是这样做的：

1：我首先使用以下方法打开相机：

- (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", @"");  
    }
}

拍摄照片时，将调用此方法：

 -(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];
}

然后通过该路径，我以全分辨率从库中获取图片（使用“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];
    }
}

希望这可以帮助您进一步:-)。

于 2012-05-22T09:10:51.037 回答