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我正在使用 OpenCV 拼接图像。我正在使用四张尺寸为"720 × 960 像素"的图像。从四个图像中，我使用了三个图像，这些图像将在应用程序启动时进行拼接。当我点击缝合按钮时，第四个将缝合。它工作正常。但是，当我将所有四个图像的大小从“720 × 960 像素更改为 640 × 960 像素”并再次在调整图像大小后运行代码时，问题就出现了，这三个图像的显示方式与我上面提到的相同，但是当我从我必须缝合第四张图像的地方点击缝合按钮时，编译器会在控制台中显示一条消息，如下所述 -

无法拼接图像，错误代码 = 1

<错误>：CGImageCreate：无效的图像大小：0 x 0。

我使用了以下代码-

在 CVViewController.h

import <UIKit/UIKit.h>

@interface CVViewController : UIViewController
{
    NSArray *arrayImgGlobal;

}
@property (weak, nonatomic) IBOutlet UIActivityIndicatorView* spinner;
@property (nonatomic, weak) IBOutlet UIScrollView* scrollView;
@end

在 CVViewController.m

#import "CVViewController.h"
#import "CVWrapper.h"

@interface CVViewController ()

@end

@implementation CVViewController

- (void)viewDidAppear:(BOOL)animated    
{
    [super viewDidAppear:animated];
    NSArray* imageArray = [NSArray arrayWithObjects:
                           [UIImage imageNamed:@"1@2x.jpg"],
                           [UIImage imageNamed:@"2@2x.jpg"],
                           [UIImage imageNamed:@"3@2x.jpg"],
                            nil];
    [self stitch:imageArray];
}

-(IBAction)onButtonStitch:(UIButton *)btn
{
    [self onBtnStitchPressed:arrayImgGlobal];
}
-(void)onBtnStitchPressed:(NSArray *)imageArray
{
    [self stitch:imageArray];
}

- (void) stitch : (NSArray *)imageArray
{
    [self.spinner startAnimating];
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
              UIImage* stitchedImage = [CVWrapper processWithArray:imageArray];
        dispatch_async(dispatch_get_main_queue(), ^{

            NSLog (@"stitchedImage %@",stitchedImage);
            for (UIImageView *imgView in [self.scrollView subviews]) {
                [imgView removeFromSuperview];
            }
            UIImageView* imageView = [[UIImageView alloc] initWithImage:stitchedImage];

            self.imageView = imageView;
            [self.scrollView addSubview:self.imageView];
            self.scrollView.backgroundColor = [UIColor blackColor];
            self.scrollView.contentSize = self.imageView.bounds.size;
            self.scrollView.maximumZoomScale = 4.0;
            self.scrollView.minimumZoomScale = 0.5;
            self.scrollView.contentOffset = CGPointMake(-(self.scrollView.bounds.size.width-self.imageView.bounds.size.width)/2, -(self.scrollView.bounds.size.height-self.imageView.bounds.size.height)/2);
            NSLog (@"scrollview contentSize %@",NSStringFromCGSize(self.scrollView.contentSize));
            [self.spinner stopAnimating];

            NSArray *arrayImages = [NSArray arrayWithObjects:
                                    stitchedImage,
                                    [UIImage imageNamed:@"4@2x.jpg"],
                                    nil];
            arrayImgGlobal = arrayImages;

        });
    });
}
- (BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    return YES;
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - scroll view delegate

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    return self.imageView;
}
@end

我在项目中使用的代码在这里

还有一件事-我已经在 ios 7.0 模拟器中测试了我的代码以及上面的链接代码。当我将它运行到设备中时，它只是在控制台中显示了我上面提到的消息。

有人可以告诉我哪里可能出错以及如何解决吗？谢谢

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