#IDCardScanner

IDCardScanner is a demo app to recognize China Identity Card informations on iOS platform.

Screenshots

##Install on iPhone

One

• Click here on your iPhone or iPad to install it directly.

Two

• Download the install package file here.

Run

This project is build With CocoaPods, so please run the following command to install before opening with Xcode.

pod install

Usage

Pick Image

There are two method to select the area to recognize,

One is picked by the user show in Case One,

We use this controller to pick:

    PECropViewController *controller = [[PECropViewController alloc] init];    
    controller.title = @"剪裁";
    controller.delegate = self;   
    controller.image = self.imageView.image;
    controller.toolbarHidden= YES;
    controller.cropAspectRatio =  856.0/540.0;
    controller.keepingCropAspectRatio = YES;

    
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:controller];
    [self presentViewController:navigationController animated:YES completion:nil];

and before rending this controller ,we use those code to inject the area to recognized:

    
    [PECropRectView aspect_hookSelector:@selector(initWithFrame:) withOptions:AspectPositionAfter usingBlock:^(id<AspectInfo> aspectInfo, CGRect frame) {
       
        PECropRectView* cropRectView = aspectInfo.instance;
        cropRectView.IDCardNameView = [[UIView alloc] initWithFrame:CGRectZero];
        cropRectView.IDCardNameView.layer.borderWidth = 1;
        cropRectView.IDCardNameView.layer.borderColor = [UIColor redColor].CGColor;
        [cropRectView addSubview:cropRectView.IDCardNameView];
        
        
        cropRectView.IDCardNumberView = [[UIView alloc] initWithFrame:CGRectZero];
        cropRectView.IDCardNumberView.layer.borderWidth = 1;
        cropRectView.IDCardNumberView.layer.borderColor = [UIColor redColor].CGColor;
        [cropRectView addSubview:cropRectView.IDCardNumberView];
        
        
    } error:NULL];
    
    
    [PECropRectView aspect_hookSelector:@selector(layoutSubviews) withOptions:AspectPositionAfter usingBlock:^(id<AspectInfo> aspectInfo) {
        PECropRectView* cropRectView = aspectInfo.instance;
        float scale = cropRectView.bounds.size.width /  856;
        cropRectView.IDCardNameView.frame = CGRectMake(160*scale, 60*scale, 220*scale, 70*scale);
        cropRectView.IDCardNumberView.frame = CGRectMake(276*scale, 420*scale, 520*scale, 80*scale);
    
    } error:NULL];
}

The other is picked automatic by OpenCV, but it also can be adjust by user.

We open the picker controller like this:

    CropViewController *crop=[[CropViewController alloc] init];
    crop.cropdelegate=self;    
    crop.title = @"剪裁";
    crop.adjustedImage=image;
    
    [picker pushViewController:crop animated:YES];

and then it will show picked area automatic.

if you want to know more details, please download this project.

Recognize Image

We use tesseract to recoginze the image , here is the core code:

    
    CGRect nameRect = CGRectMake(160, 60, 220, 70);
    CGRect IDNumberRect = CGRectMake(276, 420, 520, 80);
    
    G8RecognitionOperation *operation = [[G8RecognitionOperation alloc] initWithLanguage:@"chi_sim"];
    operation.tesseract.delegate=self;
    operation.tesseract.rect = nameRect;
    operation.recognitionCompleteBlock = ^(G8Tesseract *recognizedTesseract) {
        NSLog(@" OCR TEXT NAME: %@", [recognizedTesseract recognizedText]);
        self.nameLabel.text =[@"姓名:" stringByAppendingString: [recognizedTesseract recognizedText]];
    };
    
    
    // Add operation to queue
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    [queue addOperation:operation];
    
    
    
    
    G8RecognitionOperation *operation2 = [[G8RecognitionOperation alloc] initWithLanguage:@"chi_sim"];
    
    // Configure inner G8Tesseract object as described before
    operation2.tesseract.charWhitelist = @"1234567890X";
    operation2.tesseract.image = [image g8_blackAndWhite];
    operation2.tesseract.delegate=self;
    operation2.tesseract.rect = IDNumberRect;
    // Setup the recognitionCompleteBlock to receive the Tesseract object
    // after text recognition. It will hold the recognized text.
    operation2.recognitionCompleteBlock = ^(G8Tesseract *recognizedTesseract) {
        // Retrieve the recognized text upon completion
        NSLog(@" OCR TEXT IDNumber:%@", [recognizedTesseract recognizedText]);
        self.IDNumberLabel.text = [@"身份证号:" stringByAppendingString:[recognizedTesseract recognizedText]];
    };
    
    
    [queue addOperation:operation2];

Requirements

• iOS 7 or higher
• Automatic Reference Counting (ARC)

Author

• Lei Sun (Sina Weibo,Twitter,or Facebook )

License

IDCardScanner is released under the MIT license. See the LICENSE file for more info.