iOS OCR 之银行卡/身份证信息识别小知识

iOS OCR 之银行卡/身份证信息识别小知识

引言

功能：扫描银行卡识别信息（ 银行名称、 银行卡号）并截取银行卡图像

应用场景：快速填充银行卡号的场景，比如商户进件、实名认证

原理：

I、扫描银行卡

1.1 引入第三方SDK和头文件

exbankcard.h BankCard.h exbankcardcore.h libexbankcardios.a libbexbankcard.a

1.2 获取信息（解码）

#pragma- (void)parseBankImageBuffer:(CVImageBufferRef)imageBuffer { #if #else size_t width_t= CVPixelBufferGetWidth(imageBuffer); size_t height_t = CVPixelBufferGetHeight(imageBuffer); CVPlanarPixelBufferInfo_YCbCrBiPlanar *planar = CVPixelBufferGetBaseAddress(imageBuffer); size_t offset = NSSwapBigIntToHost(planar->componentInfoY.offset); unsigned char* baseAddress = (unsigned char *)CVPixelBufferGetBaseAddress(imageBuffer); unsigned char* pixelAddress = baseAddress + offset; size_t cbCrOffset = NSSwapBigIntToHost(planar->componentInfoCbCr.offset); uint8_t *cbCrBuffer = baseAddress + cbCrOffset; CGSize size = CGSizeMake(width_t, height_t); CGRect effectRect = [IDCardRectManager getEffectImageRect:size]; CGRect rect = [IDCardRectManager getGuideFrame:effectRect]; int width = ceilf(width_t); int height = ceilf(height_t); unsigned char result [512]; int resultLen = BankCardNV12(result, 512, pixelAddress, cbCrBuffer, width, height, rect.origin.x, rect.origin.y, rect.origin.x+rect.size.width, rect.origin.y+rect.size.height); if(resultLen > 0) { int charCount = [IDCardRectManager docode:result len:resultLen]; if(charCount > 0) { // CGRect subRect = [IDCardRectManager getCorpCardRect:width height:height guideRect:rect charCount:charCount]; self.isHasResult = YES; if ([self.captureSession isRunning]) { [self.captureSession stopRunning]; } UIImage *image = [UIImage getImageStream:imageBuffer]; // __block UIImage *subImg = [UIImage getSubImage:subRect inImage:image]; char *numbers = [IDCardRectManager getNumbers]; NSString *numberStr = [NSString stringWithCString:numbers encoding:NSASCIIStringEncoding]; NSString *bank = [BankCardSearch getBankNameByBin:numbers count:charCount]; NSLog(@"\n卡号%@\n银行类型%@",numberStr,bank); BankCardInfo *model = [JYBDBankCardInfo new]; model.bankNumber = numberStr; model.bankName = bank; AudioServicesPlaySystemSound(kSystemSoundID_Vibrate); dispatch_async(dispatch_get_main_queue(), ^{ if (self.finish) { self.finish(model, image); } }); } } CVPixelBufferUnlockBaseAddress(imageBuffer, 0); self.isInProcessing = NO; #endif

1.3 图片裁剪

void)parseBankImageBuffer:(CVImageBufferRef)imageBuffer { size_t width_t= CVPixelBufferGetWidth(imageBuffer); size_t height_t = CVPixelBufferGetHeight(imageBuffer); CGSize size = CGSizeMake(width_t, height_t); CGRect effectRect = [IDCardRectManager getEffectImageRect:size]; CGRect rect = [IDCardRectManager getGuideFrame:effectRect]; UIImage *image = [UIImage getImageStream:imageBuffer];// image 原图 __block UIImage *subImg = [UIImage getSubImage:rect inImage:image];// 裁剪 rect

工具方法

UIImage *)getImageStream:(CVImageBufferRef)imageBuffer { CIImage *ciImage = [CIImage imageWithCVPixelBuffer:imageBuffer]; CIContext *temporaryContext = [CIContext contextWithOptions:nil]; CGImageRef videoImage = [temporaryContext createCGImage:ciImage fromRect:CGRectMake(0, 0, CVPixelBufferGetWidth(imageBuffer), CVPixelBufferGetHeight(imageBuffer))]; UIImage *image = [[UIImage alloc] initWithCGImage:videoImage]; CGImageRelease(videoImage); return image;}+ (UIImage *)getSubImage:(CGRect)rect inImage:(UIImage*)image { CGImageRef subImageRef = CGImageCreateWithImageInRect(image.CGImage, rect); CGRect smallBounds = CGRectMake(0, 0, CGImageGetWidth(subImageRef), CGImageGetHeight(subImageRef)); UIGraphicsBeginImageContext(smallBounds.size); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextDrawImage(context, smallBounds, subImageRef); UIImage* smallImage = [UIImage imageWithCGImage:subImageRef]; CFRelease(subImageRef); UIGraphicsEndImageContext(); return

1.4 根据numbers和charCount查询银行名称

II 常见问题

2.1 iOS13适配:present 半屏问题

全屏显示采集界面

- (NSMutableArray *)FullScreenClasss{ if(_FullScreenClasss == nil){ [_FullScreenClasss addObject:@"KNAVCapture4IDfrontViewController"]; } return

2.2 Undefined symbols for architecture arm64

Undefined symbols for architecture arm64: "_ZIM_SaveImage", referenced from: ImgSave(tagIMG, char const*) in libbexbankcard.a(gjimage.o) "_ZIM_LoadImage", referenced from: ImgLoad(tagIMG&, char const*) in libbexbankcard.a(gjimage.o) "_ZIM_DoneImage", referenced from: ImgLoad(tagIMG&, char const*) in libbexbankcard.a(gjimage.o)ld: symbol(s) not found for

解决办法：在TARGETS和PROJECT 两处中build settings 搜索 ENABLE_TESTABILITY 改为NO

RN项目，Dead Code Stripping 设置为yes

see also

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