改善Tesseract OCR質量不合格

我目前使用tesseract掃描收據。質量不好，所以我閱讀這篇文章如何改進它：https://github.com/tesseract-ocr/tesseract/wiki/ImproveQuality#noise-removal。我實現了調整大小，歪斜（對齊）和高斯模糊。但是除了去角度之外，它們都沒有對OCR的準確性產生積極影響。這裏是我調整大小和高斯模糊的代碼。我做錯了什麼？如果不是，我還能做些什麼來提供幫助？改善Tesseract OCR質量不合格

代碼：

+(UIImage *) prepareImage: (UIImage *)image{ 

    //converts UIImage to Mat format 
    Mat im = cvMatWithImage(image); 

    //grayscale image 
    Mat gray; 
    cvtColor(im, gray, CV_BGR2GRAY); 

    //deskews text 
    //did not provide code because I know it works 
    Mat preprocessed = preprocess2(gray); 
    double skew = hough_transform(preprocessed, im); 
    Mat rotated = rot(im,skew* CV_PI/180); 

    //resize image 
    Mat scaledImage = scaleImage(rotated, 2); 

    //Guassian Blur 
    GaussianBlur(scaledImage, scaledImage, cv::Size(1, 1), 0, 0); 

    return UIImageFromCVMat(scaledImage); 
} 

// Organization -> Resizing 

Mat scaleImage(Mat mat, double factor){ 
    Mat resizedMat; 
    double width = mat.cols; 
    double height = mat.rows; 
    double aspectRatio = width/height; 
    resize(mat, resizedMat, cv::Size(width*factor*aspectRatio, height*factor*aspectRatio)); 
    return resizedMat; 
}

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