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iphone - OCR using openCV

I wants to give effects on image using openCV, I am struggling from last 2 days and do little bit from my side. But not get the good output. Till now I only convert into gray. how to achieve remaining effects?

I use this method for convert in Gray

- (void)blackAndWhite {


cv::Mat  dst;

cv::Mat src=[self cvMatFromUIImage:iv.image];


if( !src.data )
{ std::cout<<"Usage: ./Histogram_Demo <path_to_image>"<<std::endl;
}

/// Convert to grayscale
cvtColor( src, src, CV_BGR2GRAY );

/// Apply Histogram Equalization
//equalizeHist( src, dst );

iv.image =[self UIImageFromCVMat:src];   



}

Thanks

1) After convert in GRAY enter image description here

2) Apply Black and White effect

enter image description here

3) Remove dark black background and change image orientation.

enter image description here

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