Aspose.OCR for .NET 20.6 - Release Notes

This page contains release notes information for Aspose.OCR for .NET 20.6

Enhancements

• API does not need to be disposed of.
• Recognition quality improved.
• Added API support for working with streams.
• Added API support for working with recognition areas.
• Added ability to specify characters for recognition.
• Added the ability to calculate skew of the image.
• Flag for text area detection.
• Optional flag for skew correction.

Supported Characters

space	!	"	#	$	%	&	'	(	)
*	+	,	-	.	/	0	1	2	3
4	5	6	7	8	9	:	;	<	=
>	?	@	[	\	]	_	` | { | | |
}	~	A	B	C	D	E	F	G	H
I	J	K	L	M	N	O	P	Q	R
S	T	U	V	W	X	Y	Z	a	b
c	d	e	f	g	h	i	j	k	l
m	n	o	p	q	r	s	t	u	v
w	x	y	z	Â	À	Á	Ã	Ä	Æ
Ç	È	É	Ê	Ë	Ì	Í	Î	Ï	Ñ
Ò	Ó	Ô	Õ	Ö	Ù	Ú	Û	Ü	ẞ
ß	à	á	â	ã	ä	æ	ç	è	é
ê	ë	ì	í	î	ï	ñ	ò	ó	ô
õ	ö	ù	ú	û	ü	ÿ	Œ	œ	Ÿ

Public API and Backwards Incompatible Changes

New API

Method	Description
AsposeOCR()	Constructor. Create an API instance.
AsposeOcr(string alphabet)	Constructor. Create an API instance and set of allowed characters in the alphabet.
float CalculateSkew(MemoryStream image)	Calculates the skew angle in degrees of text in the image. image - MemoryStream of the image.
float CalculateSkew(string fullPath)	Calculates the skew angle in degrees of text in the image. fullPath - path to the image.
string RecognizeImage(MemoryStream stream)	Recognizing image with automatic detection of text areas and detecting, correcting skew of the text. Support for GIF, PNG, JPEG, BMP, TIFF, and WBMP. stream - MemoryStream of the image.
string RecognizeImage(string fullPath)	Recognizing image with automatic detection of text areas and detecting, correcting skew of the text. Support for GIF, PNG, JPEG, BMP, TIFF, and WBMP. fullPath - path to the image.
string RecognizeImage(MemoryStream stream, bool detectAreas, bool autoSkew = true)	Recognizing image with or without automatic detection of text areas and correct skew of the text according to parameters. Support for GIF, PNG, JPEG, BMP, TIFF, and WBMP. stream - MemoryStream of the image. detectAreas - autodetecting areas with texts. If false, the image considers as one text block. autoSkew - remove the skew image. Default - true.
List RecognizeImage(MemoryStream stream, List rects)	Recognizing text in the specified rectangles. Support for GIF, PNG, JPEG, BMP, TIFF, and WBMP. Skew alignment does not occur. stream - MemoryStream of the image. rects - list of rectangles in pixels for recognizing.
List RecognizeImage(string fullPath, List rects)	Recognizing text in the specified rectangles. Support for GIF, PNG, JPEG, BMP, TIFF, and WBMP. Skew alignment does not occur. fullPath - path to the image. rects - list of rectangles in pixels for recognizing.
string RecognizeImage(MemoryStream stream, Rectangle rects)	Recognizing text in the specified rectangle. Support for GIF, PNG, JPEG, BMP, TIFF, and WBMP. Skew alignment does not occur. stream - MemoryStream of the image. rects - rectangle in pixels for recognizing.
string RecognizeImage(string fullPath, Rectangle rects)	Recognizing text in the specified rectangle. Support for GIF, PNG, JPEG, BMP, TIFF, and WBMP. Skew alignment does not occur. fullPath - path to the image. rects - rectangle in pixels for recognizing.
string RecognizeLine(MemoryStream stream)	Recognizing an image that contains only one line of text. Skew alignment does not occur. Support for GIF, PNG, JPEG, BMP, TIFF, and WBMP. stream - MemoryStream of the image.
string RecognizeLine(string fullPath)	Recognizing an image that contains only one line of text. Skew alignment does not occur. Support for GIF, PNG, JPEG, BMP, TIFF, and WBMP. fullPath - path to the image.
List GetRectangles(MemoryStream stream)	Get detected rectangles with text areas. Skew alignment does not occur. Support for GIF, PNG, JPEG, BMP, TIFF, and WBMP. stream - MemoryStream of the image.
List GetRectangles(string fullPath)	Get detected rectangles with text areas. Skew alignment does not occur. Support for GIF, PNG, JPEG, BMP, TIFF, and WBMP. fullPath - path to the image
License()	Constructor. Create a License instance.
void SetLicense(string licenseName)	licenseName - path to xml license file.

Removed APIs

All methods of the previous release are not supported.

Usage Example

using System;

using System.Collections.Generic;

using System.Drawing;

using System.IO;

using Aspose.OCR;

namespace ProgramOCR
{
    class Program
    {
        static void Main(string[] args)
        {
            // Get API
            AsposeOcr api = new AsposeOcr();

            // Create license
            License lic = new License();
 
            // Set license 
            lic.SetLicense("Aspose.Total.lic");
 
            // Get image for recognize
            string imgPath = "test_ocr.png";
 
            /* Recognize image from file*/
 
            // Recognize image
            string result = api.RecognizeImage(imgPath);
 
            // Print result
            Console.WriteLine(result);
 
            /* Recognize image from stream*/
 
            using (MemoryStream ms = new MemoryStream())
            using (FileStream file = new FileStream(imgPath, FileMode.Open, FileAccess.Read))
            {
                file.CopyTo(ms);
                result = api.RecognizeImage(ms);
            }
            Console.WriteLine(result);
 
            /*Recognize image from file without detected texts areas and remove skew 
            (all image is a text area) */
 
            result = api.RecognizeImage(imgPath, false);
            Console.WriteLine(result);
 
            /*Recognize image from file with detected texts areas and without
            remove skew text*/
 
            result = api.RecognizeImage(imgPath, true, false);
            Console.WriteLine(result);
 
            /* Recognize image in the specified rectangles */
 
            List<Rectangle> rects = new List<Rectangle>()
            {
                new Rectangle(138, 352, 2033, 537),
                new Rectangle(147, 890, 2033, 1157),
                new Rectangle(923, 2045, 465, 102),
                new Rectangle(104, 2147, 2076, 819)
            };
 
            List<string> listResult = api.RecognizeImage(imgPath, rects);
 
            foreach (string s in listResult)
            {
                Console.WriteLine(s);
            }
 
            /* Recognize image in the specified rectangle */
 
            result = api.RecognizeImage(imgPath, rects[0]);
            Console.WriteLine(result);
 
            /* With allowed symbols*/
 
            // Create api instance with allowed symbols.
            api = new AsposeOcr("0123456789");
 
            // Get image line for recognize
            imgPath = "0002240177.Jpeg";
 
            // Recognize line
            result = api.RecognizeLine(imgPath);
 
            Console.WriteLine(result);
 
            /* Calculate skew image from stream */
 
            imgPath = "skew_image.png";
            float angle = 0;
 
            using (MemoryStream ms = new MemoryStream())
            using (FileStream file = new FileStream(imgPath, FileMode.Open, FileAccess.Read))
            {
                file.CopyTo(ms);
                angle = api.CalculateSkew(ms);
            }
            Console.WriteLine(angle);
 
            /* Calculate skew image from path to image */
 
            angle = api.CalculateSkew(imgPath);
            Console.WriteLine(angle);
        }
    }
}