iOS AVCaptureSession实现获取摄像头图像，并识别图片中身份证号码

自定义照相机通过设备摄像头实时获取身份证图片信息，然后识别图片中身份证号码，采用ocr识别数字

声明

import

import

import

import “MBProgressHUD.h”

//#import “Tesseract.h”

@protocol PassImage

-(void)PassImagedata:(id)_data;

@end

@interface DZC_Carmer_photo : UIViewController

实现

import “DZC_Carmer_photo.h”

import “UIImage+DZC_UImageScral.h”

import “DzcDES.h”

import “DZC_CustomLine.h”

//#import “Tesseract.h”

@interface DZC_Carmer_photo ()

{

UIButton *btn;

UIImageView *imgView;

}

@end

@implementation DZC_Carmer_photo

-(instancetype)init

{

self=[super init];

if (self)

{

[self initialSession];

return self;

}

return self;

}

-(void)viewWillDisappear:(BOOL)animated

{

[super viewWillDisappear:animated];

[self.operationQueue cancelAllOperations];

}

- (void)viewDidLoad {

[super viewDidLoad];

self.operationQueue = [[NSOperationQueue alloc] init];

// UIButton *carmerBtn=[[UIButton alloc]initWithFrame:CGRectMake(SCREENWIDTH/2-50, SCREENHEIGHT-100, 100, 50)];

// //[carmerBtn setTransform:CGAffineTransformMakeRotation(M_PI/2)];

// [carmerBtn setTitle:@”拍照” forState:UIControlStateNormal];

// carmerBtn.backgroundColor=[UIColor orangeColor];

// [carmerBtn addTarget:self action:@selector(shutterCamera) forControlEvents:UIControlEventTouchUpInside];

// self.shutterButton=carmerBtn;

// [self.view addSubview:carmerBtn];

// [self.view bringSubviewToFront:carmerBtn];

UIButton *returnBtn=[[UIButton alloc]initWithFrame:CGRectMake(10, SCREENHEIGHT-100, 100, 50)];

//[returnBtn setTransform:CGAffineTransformMakeRotation(M_PI/2)];

[returnBtn setTitle:@”撤销” forState:UIControlStateNormal];

returnBtn.backgroundColor=[UIColor orangeColor];

[returnBtn addTarget:self action:@selector(CloseBtn) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:returnBtn];

[self.view bringSubviewToFront:returnBtn];

UILabel *titleLable=[[UILabel alloc]initWithFrame:CGRectMake(SCREENWIDTH-110, SCREENHEIGHT-120, 100, 140)];

//[titleLable setTransform:CGAffineTransformMakeRotation(M_PI/2)];

[titleLable setFont:[UIFont systemFontOfSize:10]];

[titleLable setText:@”友情提醒：扫描身份证时请将身份证号码放置于矩形框内”];

titleLable.numberOfLines=0;
[titleLable setTextColor:[UIColor whiteColor]];
[self.view addSubview:titleLable];
MB_HUD=[[MBProgressHUD alloc]init];
[self.view addSubview:MB_HUD];

iamgeview=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 300, 60)];
iamgeview.center=CGPointMake(SCREENWIDTH/2, SCREENHEIGHT/2);
iamgeview.layer.borderWidth=2.0;
iamgeview.layer.borderColor=[UIColor orangeColor].CGColor;

[self.view addSubview:iamgeview];
[self.view bringSubviewToFront:iamgeview];

/*
imgView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 20, SCREENWIDTH, 50)];
imgView.backgroundColor=[UIColor orangeColor];
[self.view addSubview:imgView];
[self.view bringSubviewToFront:imgView];
*/

// Do any additional setup after loading the view.

}

-(void)CloseBtn

{

[self dismissViewControllerAnimated:YES completion:nil];

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

- (void) initialSession

{

//这个方法的执行我放在init方法里了

self.session = [[AVCaptureSession alloc] init];

[self.session setSessionPreset:AVCaptureSessionPresetMedium];

self.videoInput = [[AVCaptureDeviceInput alloc] initWithDevice:[self backCamera] error:nil];
//[self fronCamera]方法会返回一个AVCaptureDevice对象，因为我初始化时是采用前摄像头，所以这么写，具体的实现方法后面会介绍
/*
self.stillImageOutput = [[AVCaptureStillImageOutput alloc] init];

NSDictionary * outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys:AVVideoCodecJPEG,AVVideoCodecKey, nil];
//这是输出流的设置参数AVVideoCodecJPEG参数表示以JPEG的图片格式输出图片
[self.stillImageOutput setOutputSettings:outputSettings];
*/
self.VideoDataOutput=[[AVCaptureVideoDataOutput alloc]init];

if ([self.session canAddInput:self.videoInput]) {
[self.session addInput:self.videoInput];
}
/*
if ([self.session canAddOutput:self.stillImageOutput]) {
[self.session addOutput:self.stillImageOutput];
}
*/
if ([self.session canAddOutput:self.VideoDataOutput])
{
[self.session addOutput:self.VideoDataOutput];
dispatch_queue_t queue = dispatch_queue_create("myQueue", NULL);

[self.VideoDataOutput setSampleBufferDelegate:self queue:queue];

//dispatch_release(queue);

// Specify the pixel format

self.VideoDataOutput.videoSettings =

[NSDictionary dictionaryWithObject:

[NSNumber numberWithInt:kCVPixelFormatType_32BGRA]

forKey:(id)kCVPixelBufferPixelFormatTypeKey];

}

}

- (AVCaptureDevice *)cameraWithPosition:(AVCaptureDevicePosition) position {

NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];

for (AVCaptureDevice *device in devices) {

if ([device position] == position) {

_cameraAvaible=YES;

return device;

}

}

_cameraAvaible=NO;

return nil;

}

(AVCaptureDevice *)frontCamera {

return [self cameraWithPosition:AVCaptureDevicePositionFront];

}

(AVCaptureDevice *)backCamera {

return [self cameraWithPosition:AVCaptureDevicePositionBack];

}

//接下来在viewWillAppear方法里执行加载预览图层的方法

(void) setUpCameraLayer

{

if (_cameraAvaible == NO) return;

if (self.previewLayer == nil) {

self.previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];
self.previewLayer.videoGravity=AVLayerVideoGravityResizeAspect;
self.previewLayer.frame=CGRectMake(0,0, SCREENWIDTH, SCREENHEIGHT);
self.previewLayer.position=CGPointMake(SCREENWIDTH/2, SCREENHEIGHT/2);
[self.view.layer insertSublayer:self.previewLayer atIndex:0];

/*
self.previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];
self.cameraShowView=[[UIView alloc]initWithFrame:CGRectMake(0, 20, SCREENWIDTH, 300)];
UIView * view = self.cameraShowView;
CALayer * viewLayer = [view layer];
[viewLayer setMasksToBounds:YES];

CGRect bounds = [view bounds];
[self.previewLayer setFrame:bounds];
[self.previewLayer setVideoGravity:AVLayerVideoGravityResizeAspect];

[viewLayer insertSublayer:self.previewLayer below:[[viewLayer sublayers] objectAtIndex:0]];
*/

}

}

-(void)viewWillAppear:(BOOL)animated

{

[super viewWillAppear:animated];

[self setUpCameraLayer];

// DZC_CustomLine *line=[[DZC_CustomLine alloc]init];

// line.backgroundColor=[UIColor clearColor];

// line.frame=self.previewLayer.frame;

// [self.view addSubview:line];

// [line setNeedsDisplay];

//[self turnOnLed];//打开闪光灯

}

//在viewDidAppear和viewDidDisappear方法中启动和关闭session

(void) viewDidAppear:(BOOL)animated

{

[super viewDidAppear:animated];

if (self.session) {

[self.session startRunning];

}

}

(void) viewDidDisappea
4000
r:(BOOL)animated

{

[super viewDidDisappear: animated];

if (self.session) {

[self.session stopRunning];

}

[self.previewLayer removeFromSuperlayer];

self.previewLayer =nil;

self.session=nil;

//[self turnOffLed];//关闭闪光灯

}

//这是切换镜头的按钮方法

(void)toggleCamera {

NSUInteger cameraCount = [[AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo] count];

if (cameraCount > 1) {

NSError *error;

AVCaptureDeviceInput *newVideoInput;

AVCaptureDevicePosition position = [[_videoInput device] position];

if (position == AVCaptureDevicePositionBack)
newVideoInput = [[AVCaptureDeviceInput alloc] initWithDevice:[self frontCamera] error:&error];
else if (position == AVCaptureDevicePositionFront)
newVideoInput = [[AVCaptureDeviceInput alloc] initWithDevice:[self backCamera] error:&error];
else
return;

if (newVideoInput != nil) {
[self.session beginConfiguration];
[self.session removeInput:self.videoInput];
if ([self.session canAddInput:newVideoInput]) {
[self.session addInput:newVideoInput];
[self setVideoInput:newVideoInput];
} else {
[self.session addInput:self.videoInput];
}
[self.session commitConfiguration];
} else if (error) {
NSLog(@"toggle carema failed, error = %@", error);
}

}

DLog(@”切换摄像头”);

}

// 这是拍照按钮的方法

(void) shutterCamera

{

[MB_HUD show:YES];

self.shutterButton.userInteractionEnabled=NO;

AVCaptureConnection * videoConnection = [self.stillImageOutput connectionWithMediaType:AVMediaTypeVideo];

if (!videoConnection) {

[MB_HUD setDetailsLabelText:@"take photo failed!"];
[MB_HUD hide:YES afterDelay:1.0];
return;

}

[self.stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {

if (imageDataSampleBuffer == NULL) {

[MB_HUD setDetailsLabelText:@”take photo null!”];

[MB_HUD hide:YES afterDelay:1.0];

return;

}

NSData * imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
UIImage * image = [UIImage imageWithData:imageData];
DLog(@"image size = %@",NSStringFromCGSize(image.size));

UIImage * imageOne=[self fixOrientation:image];

UIImage *imageTwo=[self image:imageOne rotation:UIImageOrientationLeft];

UIImage *imageThree=[self scaleFromImage:imageTwo toSize:CGSizeMake(308, 400)];

DLog(@”image size = %@”,NSStringFromCGSize(imageThree.size));

[self.delegate PassImagedata:imageThree];

imageThree=nil;

[MB_HUD hide:YES];

[self dismissViewControllerAnimated:YES completion:nil];

//[self turnOffLed];

}];

}

-(void)captureOutput:(AVCaptureOutput )captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection )connection

{

DLog(@”有图片”);

[NSThread sleepForTimeInterval:1.5];

[self showImageView:sampleBuffer];

}

-(void)showImageView:(CMSampleBufferRef)_sampleBuffer

{

UIImage *image=[self imageFromSampleBuffer:_sampleBuffer];

if (image)
{
UIImage *one=[self fixOrientation:image];
NSData *data=UIImageJPEGRepresentation(one, 1.0);
one=[UIImage imageWithData:data];
UIImage * img=[one getSubImage:CGRectMake(SCREENWIDTH/2-150, iamgeview.frame.origin.y-60, iamgeview.frame.size.width, iamgeview.frame.size.height)];
img=[self grayscale:img type:3];

/*
UIImage *imag=[UIImage imageNamed:@"image_sample.jpg"];
imag=[self grayscale:imag type:3];
*/
[self recognizeImageWithTesseract:img];
/*
Tesseract *tesseract= [[Tesseract alloc] initWithDataPath:@"tessdata" language:@"eng"];
[tesseract setVariableValue:@"0123456789" forKey:@"tessedit_char_whitelist"];
[tesseract setImage:img];
[tesseract recognize];
NSString *str=[tesseract recognizedText];
[tesseract clear];

tesseract=nil;
str=[DzcDES trim:str];
NSRange range=[str rangeOfString:@" "];
if (range.location !=NSNotFound)
{
NSArray *array=[str componentsSeparatedByString:@" "];

for(NSString *ss in array)
{
DLog(@"---%@",ss);
NSString * s=[DzcDES trim:ss];
if ([DzcDES validateIdentityCard:s])
{
DLog(@"字符串为身份证号码");
dispatch_async(dispatch_get_main_queue(), ^{

[MB_HUD show:YES];
[MB_HUD setDetailsLabelText:s];

[self.delegate PassImagedata:s];
[self dismissViewControllerAnimated:YES completion:nil];

});
}

}
}
else
{
str=[DzcDES trim:str];
if ([DzcDES validateIdentityCard:str])
{
dispatch_async(dispatch_get_main_queue(), ^{

[MB_HUD show:YES];
[MB_HUD setDetailsLabelText:str];

[self.delegate PassImagedata:str];
[self dismissViewControllerAnimated:YES completion:nil];
});
}

}

[[NSThread currentThread]cancel];

*/

}
return;

}

//修正图片方向

- (UIImage )fixOrientation:(UIImage )aImage

{

// No-op if the orientation is already correct
if (aImage.imageOrientation == UIImageOrientationUp)
return aImage;

// We need to calculate the proper transformation to make the image upright.
// We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.
CGAffineTransform transform = CGAffineTransformIdentity;

switch (aImage.imageOrientation) {
case UIImageOrientationDown:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;

case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
transform = CGAffineTransformRotate(transform, M_PI_2);
break;

case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, 0, aImage.size.height);
transform = CGAffineTransformRotate(transform, -M_PI_2);
break;
default:
break;
}

switch (aImage.imageOrientation) {
case UIImageOrientationUpMirrored:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;

case UIImageOrientationLeftMirrored:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.height, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
default:
break;
}

// Now we draw the underlying CGImage into a new context, applying the transform
// calculated above.
CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,
CGImageGetBitsPerComponent(aImage.CGImage), 0,
CGImageGetColorSpace(aImage.CGImage),
CGImageGetBitmapInfo(aImage.CGImage));
CGContextConcatCTM(ctx, transform);
switch (aImage.imageOrientation) {
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
// Grr...
CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage);
break;

default:
CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage);
break;
}

// And now we just create a new UIImage from the drawing context
CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
UIImage *img = [UIImage imageWithCGImage:cgimg];
CGContextRelease(ctx);
CGImageRelease(cgimg);
return img;

}

pragma mark - Navigation

/*

// In a storyboard-based application, you will often want to do a little preparation before navigation

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

// Get the new view controller using [segue destinationViewController].

// Pass the selected object to the new view controller.

}

*/

- (UIImage )image:(UIImage )image rotation:(UIImageOrientation)orientation

{

long double rotate = 0.0;

CGRect rect;

float translateX = 0;

float translateY = 0;

float scaleX = 1.0;

float scaleY = 1.0;

switch (orientation) {
case UIImageOrientationLeft:
rotate = M_PI_2;
rect = CGRectMake(0, 0, image.size.height, image.size.width);
translateX = 0;
translateY = -rect.size.width;
scaleY = rect.size.width/rect.size.height;
scaleX = rect.size.height/rect.size.width;
break;
case UIImageOrientationRight:
rotate = 3 * M_PI_2;
rect = CGRectMake(0, 0, image.size.height, image.size.width);
translateX = -rect.size.height;
translateY = 0;
scaleY = rect.size.width/rect.size.height;
scaleX = rect.size.height/rect.size.width;
break;
case UIImageOrientationDown:
rotate = M_PI;
rect = CGRectMake(0, 0, image.size.width, image.size.height);
translateX = -rect.size.width;
translateY = -rect.size.height;
break;
default:
rotate = 0.0;
rect = CGRectMake(0, 0, image.size.width, image.size.height);
translateX = 0;
translateY = 0;
break;
}

UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
//做CTM变换
CGContextTranslateCTM(context, 0.0, rect.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextRotateCTM(context, rotate);
CGContextTranslateCTM(context, translateX, translateY);

CGContextScaleCTM(context, scaleX, scaleY);
//绘制图片
CGContextDrawImage(context, CGRectMake(0, 0, rect.size.width, rect.size.height), image.CGImage);

UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();

return newPic;

}

// 改变图像的尺寸，方便上传服务器

- (UIImage ) scaleFromImage: (UIImage ) image toSize: (CGSize) size

{

UIGraphicsBeginImageContext(size);

[image drawInRect:CGRectMake(0, 0, size.width, size.height)];

UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsPopContext();

UIGraphicsEndImageContext();

return newImage;

}

-(void)turnOffLed {

AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

if ([device hasTorch]) {

[device lockForConfiguration:nil];

[device setTorchMode: AVCaptureTorchModeOff];

[device unlockForConfiguration];

}

}

-(void)turnOnLed {

AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

if ([device hasTorch]) {

[device lockForConfiguration:nil];

[device setTorchMode: AVCaptureTorchModeOn];

[device unlockForConfiguration];

}

}

// 通过抽样缓存数据创建一个UIImage对象

- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer

{

// Get a CMSampleBuffer’s Core Video image buffer for the media data

CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);

// Lock the base address of the pixel buffer

CVPixelBufferLockBaseAddress(imageBuffer, 0);

// Get the number of bytes per row for the pixel buffer
void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);

// Get the number of bytes per row for the pixel buffer
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
// Get the pixel buffer width and height
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);

// Create a device-dependent RGB color space
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

// Create a bitmap graphics context with the sample buffer data
CGContextRef context = CGBitmapContextCreate(baseAddress, width, height, 8,
bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
// Create a Quartz image from the pixel data in the bitmap graphics context
CGImageRef quartzImage = CGBitmapContextCreateImage(context);
// Unlock the pixel buffer
CVPixelBufferUnlockBaseAddress(imageBuffer,0);

// Free up the context and color space
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);

// Create an image object from the Quartz image
//UIImage *image = [UIImage imageWithCGImage:quartzImage];
UIImage *image = [UIImage imageWithCGImage:quartzImage scale:1.0f orientation:UIImageOrientationRight];

// Release the Quartz image
CGImageRelease(quartzImage);

return image;

}

//将图片改成黑白图片

- (UIImage*)grayscale:(UIImage*)anImage type:(int)type {

CGImageRef imageRef = anImage.CGImage;

size_t width  = CGImageGetWidth(imageRef);
size_t height = CGImageGetHeight(imageRef);

size_t bitsPerComponent = CGImageGetBitsPerComponent(imageRef);
size_t bitsPerPixel = CGImageGetBitsPerPixel(imageRef);

size_t bytesPerRow = CGImageGetBytesPerRow(imageRef);

CGColorSpaceRef colorSpace = CGImageGetColorSpace(imageRef);

CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imageRef);

bool shouldInterpolate = CGImageGetShouldInterpolate(imageRef);

CGColorRenderingIntent intent = CGImageGetRenderingIntent(imageRef);

CGDataProviderRef dataProvider = CGImageGetDataProvider(imageRef);

CFDataRef data = CGDataProviderCopyData(dataProvider);

UInt8 *buffer = (UInt8*)CFDataGetBytePtr(data);

NSUInteger  x, y;
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
UInt8 *tmp;
tmp = buffer + y * bytesPerRow + x * 4;

UInt8 red,green,blue;
red = *(tmp + 0);
green = *(tmp + 1);
blue = *(tmp + 2);

UInt8 brightness;
switch (type) {
case 1:
brightness = (77 * red + 28 * green + 151 * blue) / 256;
*(tmp + 0) = brightness;
*(tmp + 1) = brightness;
*(tmp + 2) = brightness;
break;
case 2:
*(tmp + 0) = red;
*(tmp + 1) = green * 0.7;
*(tmp + 2) = blue * 0.4;
break;
case 3:
*(tmp + 0) = 255 - red;
*(tmp + 1) = 255 - green;
*(tmp + 2) = 255 - blue;
break;
default:
*(tmp + 0) = red;
*(tmp + 1) = green;
*(tmp + 2) = blue;
break;
}
}
}

CFDataRef effectedData = CFDataCreate(NULL, buffer, CFDataGetLength(data));

CGDataProviderRef effectedDataProvider = CGDataProviderCreateWithCFData(effectedData);

CGImageRef effectedCgImage = CGImageCreate(
width, height,
bitsPerComponent, bitsPerPixel, bytesPerRow,
colorSpace, bitmapInfo, effectedDataProvider,
NULL, shouldInterpolate, intent);

UIImage *effectedImage = [[UIImage alloc] initWithCGImage:effectedCgImage];

CGImageRelease(effecte
aa76
dCgImage);

CFRelease(effectedDataProvider);

CFRelease(effectedData);

CFRelease(data);

return effectedImage ;

}

pragma mark- 图片识别代码

-(void)recognizeImageWithTesseract:(UIImage *)image

{

// Animate a progress activity indicator

// Create a new `G8RecognitionOperation` to perform the OCR asynchronously
// It is assumed that there is a .traineddata file for the language pack
// you want Tesseract to use in the "tessdata" folder in the root of the
// project AND that the "tessdata" folder is a referenced folder and NOT
// a symbolic group in your project
G8RecognitionOperation *operation = [[G8RecognitionOperation alloc] initWithLanguage:@"eng"];

// Use the original Tesseract engine mode in performing the recognition
// (see G8Constants.h) for other engine mode options
operation.tesseract.engineMode = G8OCREngineModeTesseractOnly;

// Let Tesseract automatically segment the page into blocks of text
// based on its analysis (see G8Constants.h) for other page segmentation
// mode options
operation.tesseract.pageSegmentationMode = G8PageSegmentationModeAutoOnly;

// Optionally limit the time Tesseract should spend performing the
// recognition
//operation.tesseract.maximumRecognitionTime = 1.0;

// Set the delegate for the recognition to be this class
// (see `progressImageRecognitionForTesseract` and
// `shouldCancelImageRecognitionForTesseract` methods below)
operation.delegate = self;

// Optionally limit Tesseract's recognition to the following whitelist
// and blacklist of characters
operation.tesseract.charWhitelist = @"0123456789";
//operation.tesseract.charBlacklist = @"56789";

// Set the image on which Tesseract should perform recognition
operation.tesseract.image = image;

// Optionally limit the region in the image on which Tesseract should
// perform recognition to a rectangle
//operation.tesseract.rect = CGRectMake(20, 20, 100, 100);

// Specify the function block that should be executed when Tesseract
// finishes performing recognition on the image
operation.recognitionCompleteBlock = ^(G8Tesseract *tesseract) {
// Fetch the recognized text
NSString *recognizedText = tesseract.recognizedText;

DLog(@"－－－－－%@", recognizedText);
NSString * str=[DzcDES trim:recognizedText];
NSRange range=[str rangeOfString:@" "];
if (range.location !=NSNotFound)
{
NSArray *array=[str componentsSeparatedByString:@" "];

for(NSString *ss in array)
{
DLog(@"---%@",ss);
NSString * s=[DzcDES trim:ss];
if ([DzcDES validateIdentityCard:s])
{
DLog(@"字符串为身份证号码");
dispatch_async(dispatch_get_main_queue(), ^{

[self.delegate PassImagedata:s];
[self dismissViewControllerAnimated:YES completion:nil];

});
}

}
}
else
{
str=[DzcDES trim:str];
if ([DzcDES validateIdentityCard:str])
{
dispatch_async(dispatch_get_main_queue(), ^{

[self.delegate PassImagedata:str];
[self dismissViewControllerAnimated:YES completion:nil];
});
}

}

// Remove the animated progress activity indicator

// Spawn an alert with the recognized text

};

// Display the image to be recognized in the view

// Finally, add the recognition operation to the queue
[self.operationQueue addOperation:operation];

}

-(void)progressImageRecognitionForTesseract:(G8Tesseract *)tesseract

{

DLog(@”progress: %lu”, (unsigned long)tesseract.progress);

}

-(BOOL)shouldCancelImageRecognitionForTesseract:(G8Tesseract *)tesseract

{

return NO;

}

@end