Question

message tables的CvVideoCamera使用情况无法正常工作。在委托人的processImage中修改的图像显示为完全不变。

ViewController.h：

#import <UIKit/UIKit.h>
#import <opencv2/videoio/cap_ios.h>

@interface ViewController : UIViewController
@property (weak, nonatomic) IBOutlet UIButton *btnStart;
@property (weak, nonatomic) IBOutlet UIImageView *myimg;

@end

ViewController.mm：

#import "ViewController.h"
#import <opencv2/videoio/cap_ios.h>

@interface ViewController ()<CvVideoCameraDelegate>
@property (strong, nonatomic) CvVideoCamera *videoCamera;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.videoCamera = [[CvVideoCamera alloc] initWithParentView:self.myimg];
    [self.videoCamera setDelegate:self];
    self.videoCamera.defaultAVCaptureDevicePosition = AVCaptureDevicePositionBack;
    self.videoCamera.defaultAVCaptureSessionPreset = AVCaptureSessionPresetHigh;
    self.videoCamera.defaultAVCaptureVideoOrientation = AVCaptureVideoOrientationPortrait;
    self.videoCamera.defaultFPS = 30;
    self.videoCamera.useAVCaptureVideoPreviewLayer = YES;
}

- (IBAction)actionStart:(id)sender {
    [self.videoCamera start];
}

- (void)processImage:(cv::Mat &)image;
{
    cv::Mat image_copy;
    cvtColor(image, image_copy, CV_BGRA2BGR);
    bitwise_not(image_copy, image_copy);
    cvtColor(image_copy, image, CV_BGR2BGRA);
}

一旦我按下按钮，正常的摄像机流将呈现，没有任何干预的痕迹。我还尝试绘制形状，甚至在image.release()内调用processImage都无效。

我想我这里缺少明显的东西。 Simple example

There's the example repository

Answer 1

此行是问题的根源：

let myArray = []

if (this.parameter && this.search ?) {
  myArray = this.parameter.filter((download) => {
    return download.barcode.includes(this.search.toLowerCase())
  })
}

return myArray

一旦删除，一切都会按预期进行。

CvVideoCamera processImage不会更改图像

1 个答案: