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Objective c CIDetector不是';t释放存储器_Objective C_Ios7_Ciimage - Fatal编程技术网

Objective c CIDetector不是';t释放存储器

Objective c CIDetector不是';t释放存储器,objective-c,ios7,ciimage,Objective C,Ios7,Ciimage,我多次使用CIDetector,如下所示: -(NSArray *)detect:(UIImage *)inimage { UIImage *inputimage = inimage; UIImageOrientation exifOrientation = inimage.imageOrientation; NSNumber *orientation = [NSNumber numberWithInt:exifOrientatio

我多次使用CIDetector,如下所示:

    -(NSArray *)detect:(UIImage *)inimage
    {
        UIImage *inputimage = inimage;
        UIImageOrientation exifOrientation = inimage.imageOrientation;
        NSNumber *orientation = [NSNumber numberWithInt:exifOrientation];

        NSDictionary *imageOptions = [NSDictionary dictionaryWithObject:orientation forKey:CIDetectorImageOrientation];
        CIImage* ciimage = [CIImage imageWithCGImage:inputimage.CGImage options:imageOptions];


        NSDictionary *detectorOptions = [NSDictionary dictionaryWithObject:orientation forKey:CIDetectorImageOrientation];

        NSArray* features = [self.detector featuresInImage:ciimage options:detectorOptions];

        if (features.count == 0)
        {
            PXLog(@"no face found");
        }

        ciimage = nil;
        NSMutableArray *returnArray = [NSMutableArray new];


        for(CIFaceFeature *feature in features)
        {
            CGRect rect = feature.bounds;
            CGRect r = CGRectMake(rect.origin.x,inputimage.size.height - rect.origin.y - rect.size.height,rect.size.width,rect.size.height);

            FaceFeatures * ff = [[FaceFeatures new] initWithLeftEye:CGPointMake(feature.leftEyePosition.x, inputimage.size.height - feature.leftEyePosition.y )
                                                           rightEye:CGPointMake(feature.rightEyePosition.x, inputimage.size.height - feature.rightEyePosition.y )
                                                              mouth:CGPointMake(feature.mouthPosition.x, inputimage.size.height - feature.mouthPosition.y )];

            Face *ob = [[Face new] initFaceInRect:r withFaceFeatures:ff] ;


            [returnArray addObject:ob];
        }

        features = nil;
        return returnArray;
    }

-(CIContext*) context{
    if(!_context){
        _context = [CIContext contextWithOptions:nil];
    }
    return _context;
}
-(CIDetector *)detector
{
    if (!_detector)
    {
        // 1 for high 0 for low
#warning not checking for fast/slow detection operation
        NSString *str = @"fast";//[SettingsFunctions retrieveFromUserDefaults:@"face_detection_accuracy"];


        if ([str isEqualToString:@"slow"])
        {
            //DDLogInfo(@"faceDetection: -I- Setting accuracy to high");
            _detector = [CIDetector detectorOfType:CIDetectorTypeFace context:nil
                                           options:[NSDictionary dictionaryWithObject:CIDetectorAccuracyHigh forKey:CIDetectorAccuracy]];
        } else {
            //DDLogInfo(@"faceDetection: -I- Setting accuracy to low");
            _detector = [CIDetector detectorOfType:CIDetectorTypeFace context:nil
                                           options:[NSDictionary dictionaryWithObject:CIDetectorAccuracyLow forKey:CIDetectorAccuracy]];
        }

    }
    return _detector;
}
但在出现各种内存问题后,根据仪器,它看起来像是
NSArray*features=[self.detector features图像:ciimage选项:detector选项]未被发布

我的代码中有内存泄漏吗


我遇到了同样的问题,这似乎是重用CIDetector的一个bug(或者是出于缓存目的而设计的)

我没有重用CIDetector,而是根据需要实例化一个CIDetector,然后在检测完成后释放它(或者,用ARC术语来说,就是不保留引用),从而绕过了它。这样做会有一些成本,但是如果您像您所说的那样在后台线程上进行检测,那么与无限内存增长相比,这个成本可能是值得的

也许更好的解决方案是,如果您连续检测多个图像,创建一个检测器,将其用于所有图像(或者,如果增长过大,则可能每N个图像发布并创建一个新的检测器。您必须进行实验,以确定N应该是什么)


我已经向苹果公司提交了一个关于这个问题的雷达bug:

我已经解决了这个问题,你应该在涉及检测方法的地方使用@autorelease,就像在swift中这样

            autoreleasepool(invoking: { 
                let result = self.detect(image: image)
                // do other things
            })

是否从后台线程调用detect(),如从captureOutput()或类似的调用?请尝试使用@autorelease块包围检测器。我们在非UI线程上遇到了内存无法自动释放的问题,这为我们解决了许多问题。这对ARC也有效吗?你用@autorelease块包装了什么部分?在玩了几天之后()这可能是最好的也是唯一的选择,直到苹果不修复它(smh),但我想指出一点:cidetector必须在detect函数中——苹果说最好的方法是创建一个实例,然后全部重用它——bulls***和异步调用也可以。在我的例子中,没有autoreleasepool的内存从50分钟变为140mb,并保持在那里,而autoreleasepool的内存从50分钟变为75-79mb,不管有多少图片