claseAuxiliar.mm

//
//  claseAuxiliar.m
//  pruebaTesseract
//
//  Created by Admin on 03/06/12.
//  Copyright (c) 2012 __MyCompanyName__. All rights reserved.
//

#import "claseAuxiliar.h"


#include "baseapi.h"

//#include "environ.h"
//#import "pix.h"

static inline double radians (double degrees) {return degrees * M_PI/180;}

@implementation claseAuxiliar

-(id)init {
    self = [super init];
    if (self) {
        // Set up the tessdata path. This is included in the application bundle
        // but is copied to the Documents directory on the first run.
        NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentPath = ([documentPaths count] > 0) ? [documentPaths objectAtIndex:0] : nil;
        
        NSString *dataPath = [documentPath stringByAppendingPathComponent:@"tessdata"];
        NSFileManager *fileManager = [NSFileManager defaultManager];
        // If the expected store doesn't exist, copy the default store.
        if (![fileManager fileExistsAtPath:dataPath]) {
            // get the path to the app bundle (with the tessdata dir)
            NSString *bundlePath = [[NSBundle mainBundle] bundlePath];
            NSString *tessdataPath = [bundlePath stringByAppendingPathComponent:@"tessdata"];
            if (tessdataPath) {
                [fileManager copyItemAtPath:tessdataPath toPath:dataPath error:NULL];
            }
        }
        
        setenv("TESSDATA_PREFIX", [[documentPath stringByAppendingString:@"/"] UTF8String], 1);
        
        // init the tesseract engine.
        tesseract = new tesseract::TessBaseAPI();
        tesseract->Init([dataPath cStringUsingEncoding:NSUTF8StringEncoding], "eng");

    }
    return self;
}


- (NSString *) ocrImage: (UIImage *) uiImage
{
    
    //code from http://robertcarlsen.net/2009/12/06/ocr-on-iphone-demo-1043
    
    CGSize imageSize = [uiImage size];
    double bytes_per_line	= CGImageGetBytesPerRow([uiImage CGImage]);
    double bytes_per_pixel	= CGImageGetBitsPerPixel([uiImage CGImage]) / 8.0;
    
    CFDataRef data = CGDataProviderCopyData(CGImageGetDataProvider([uiImage CGImage]));
    const UInt8 *imageData = CFDataGetBytePtr(data);
    
    // this could take a while. maybe needs to happen asynchronously.
    char* text = tesseract->TesseractRect(imageData,(int)bytes_per_pixel,(int)bytes_per_line, 0, 0,(int) imageSize.height,(int) imageSize.width);
    
    // Do something useful with the text!
   // NSLog(@"Converted text: %@",[NSString stringWithCString:text encoding:NSUTF8StringEncoding]);
    
    return [NSString stringWithCString:text encoding:NSUTF8StringEncoding];
}


//http://www.iphonedevsdk.com/forum/iphone-sdk-development/7307-resizing-photo-new-uiimage.html#post33912
-(UIImage *)resizeImage:(UIImage *)image {
    
    CGImageRef imageRef = [image CGImage];
    CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(imageRef);
    CGColorSpaceRef colorSpaceInfo = CGColorSpaceCreateDeviceRGB();
    
    if (alphaInfo == kCGImageAlphaNone)
        alphaInfo = kCGImageAlphaNoneSkipLast;
    
    int width, height;
    
    width = 640;//[image size].width;
    height = 640;//[image size].height;
    
    CGContextRef bitmap;
    
    if (image.imageOrientation == UIImageOrientationUp | image.imageOrientation == UIImageOrientationDown) {
        bitmap = CGBitmapContextCreate(NULL, width, height, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, alphaInfo);
        
    } else {
        bitmap = CGBitmapContextCreate(NULL, height, width, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, alphaInfo);
        
    }
    
    if (image.imageOrientation == UIImageOrientationLeft) {
        NSLog(@"image orientation left");
        CGContextRotateCTM (bitmap, radians(90));
        CGContextTranslateCTM (bitmap, 0, -height);
        
    } else if (image.imageOrientation == UIImageOrientationRight) {
        NSLog(@"image orientation right");
        CGContextRotateCTM (bitmap, radians(-90));
        CGContextTranslateCTM (bitmap, -width, 0);
        
    } else if (image.imageOrientation == UIImageOrientationUp) {
        NSLog(@"image orientation up");	
        
    } else if (image.imageOrientation == UIImageOrientationDown) {
        NSLog(@"image orientation down");	
        CGContextTranslateCTM (bitmap, width,height);
        CGContextRotateCTM (bitmap, radians(-180.));
        
    }
    
    CGContextDrawImage(bitmap, CGRectMake(0, 0, width, height), imageRef);
    CGImageRef ref = CGBitmapContextCreateImage(bitmap);
    UIImage *result = [UIImage imageWithCGImage:ref];
    
    CGContextRelease(bitmap);
    CGImageRelease(ref);
    
    return result;	
}



@end