TesseractOCR 文字识别 自定义拍照界面(AVFoundation)

<pre name="code" class="objc">//头文件

<pre name="code" class="objc">#import "MyViewController.h"#import <TesseractOCR/TesseractOCR.h>#import "GPUImage.h"#import <AVFoundation/AVFoundation.h>#import "CameraViewController.h"#import <MobileCoreServices/MobileCoreServices.h>#import <GLKit/GLKit.h>

//需要引入的 代理

@interface MyViewController ()<G8TesseractDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate, AVCaptureMetadataOutputObjectsDelegate, AVCaptureVideoDataOutputSampleBufferDelegate>{    AVCaptureSession *session;    }

</pre><pre name="code" class="objc">#viewwilldid load 里面写的

AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];    //创建输入流    AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];    //创建输出流    AVCaptureVideoDataOutput * output = [[AVCaptureVideoDataOutput alloc]init];    //设置代理 在主线程里刷新    [output setSampleBufferDelegate:self queue:dispatch_get_main_queue()];    //初始化链接对象    session = [[AVCaptureSession alloc]init];    //高质量采集率    [session setSessionPreset:AVCaptureSessionPresetHigh];            self.context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];    self.glkView = [[GLKView alloc] initWithFrame:CGRectMake(0, 0, systemHeight, systemWidth) context:self.context];        self.cicontext = [CIContext contextWithEAGLContext:self.context];    [self.view addSubview:self.glkView];<pre name="code" class="objc">[session addOutput:output];    [session addInput:input];

<pre name="code" class="objc">#pragma mark AVCaptureVideoDataOutputSampleBufferDelegate(代理)- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection{        CVImageBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);    CIImage *image = [CIImage imageWithCVPixelBuffer:pixelBuffer];    if (self.context != [EAGLContext currentContext]) {        [EAGLContext setCurrentContext:self.context];    }    [self.glkView bindDrawable];    [self.cicontext drawImage:image inRect:[image extent] fromRect:[image extent]];    [self.glkView display];            CGAffineTransform at = CGAffineTransformMakeRotation(M_PI/2);    at = CGAffineTransformTranslate(at, 0, 0);        [self.glkView setTransform:at];        self.glkView.center = self.view.center;        self.myImage = [self.glkView snapshot];    }#pragma mark 点击拍照按钮(自己随便加一个按钮就行)- (IBAction)onoffButtonClick:(id)sender {        if ([session isRunning]) {        //停止捕获        [session stopRunning];                UIImage *image = [self image:self.myImage rotation:UIImageOrientationRight];                int x = image.size.width/systemWidth;        int y = image.size.height/systemHeight;                UIImage *getImage = [self imageFromImage:image inRect:CGRectMake(self.redView.frame.origin.x * x, self.redView.frame.origin.y * y, self.redView.frame.size.width * x, self.redView.frame.size.height * y)];                [self getStringFrom:getImage];//        UIImageWriteToSavedPhotosAlbum( getImage, nil, nil, nil);            }else{        //开始捕获        [session startRunning];    }}//旋转图片(glkview 需要旋转 所以图片也是)-(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;}//识别- (void)getStringFrom:(UIImage *)image{    G8Tesseract *tesseract = [[G8Tesseract alloc] initWithLanguage:@"eng"];    tesseract.pageSegmentationMode = G8PageSegmentationModeAutoOnly;    tesseract.engineMode = G8OCREngineModeTesseractOnly;//让他更准    tesseract.maximumRecognitionTime = 3.0;    tesseract.charWhitelist = @"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNO0PQRSTUVWXYZ";        GPUImageAdaptiveThresholdFilter *fileter = [[GPUImageAdaptiveThresholdFilter alloc] init];        fileter.blurRadiusInPixels = 2;        tesseract.image = [fileter imageByFilteringImage:[self Erzhiimage:image]];            [tesseract recognize];              self.mylabel.text = [tesseract recognizedText];    NSLog(@"%@", [tesseract recognizedText]);        [self convertImage:image];        [G8Tesseract clearCache];}

//从图片中截取一部分图片(按比例)- (UIImage *)imageFromImage:(UIImage *)image inRect:(CGRect)rect {    CGImageRef sourceImageRef = [image CGImage];    CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, rect);    UIImage *newImage = [UIImage imageWithCGImage:newImageRef];    return newImage;}