开源软件名称:ldiqual/tesseract-ios
开源软件地址:https://github.com/ldiqual/tesseract-ios
开源编程语言:
C++
56.7%
开源软件介绍:Tesseract for iOS
tesseract-ios is not actively maintained anymore. I encourage you to use gali8's Tesseract-OCR-iOS instead.
About
Tesseract-ios is an Objective-C wrapper for Tesseract OCR.
This project couldn't exist without the Ângelo Suzuki's blog post. A lot of code came from his article.
Requirements
- iOS SDK 6.0, iOS 5.0+ (there is no support for armv6)
- Tesseract and Leptonica libraries from the tesseract-ios-lib repo.
Installation
- Add
tesseract-ios as a group, and tessdata by reference to your project:
- Go to your project settings, and ensure that
C++ Standard Library => libstdc++ :
Usage
Here is the default workflow to extract text from an image:
- Instantiate Tesseract with data path and language
- Set variables (character set, …)
- Set the image to analyze
- Start recognition
- Get recognized text
- Clear
Code Sample
#import "Tesseract.h"
Tesseract* tesseract = [[Tesseract alloc] initWithDataPath:@"tessdata" language:@"eng"];
[tesseract setVariableValue:@"0123456789" forKey:@"tessedit_char_whitelist"];
[tesseract setImage:[UIImage imageNamed:@"image_sample.jpg"]];
[tesseract recognize];
NSLog(@"%@", [tesseract recognizedText]);
[tesseract clear];
Method reference
-initWithDataPath:language:
- (id)initWithDataPath:(NSString *)dataPath language:(NSString *)language
Initialize a new Tesseract instance.
dataPath : a relative path from the application bundle to the .traineddata files. You can find these files from the tesseract downloads section.
language : language used for recognition. Ex: eng . Tesseract will search for a eng.traineddata file in the dataPath directory.
Returns nil if instanciation failed.
-setVariableValue:forKey:
- (void)setVariableValue:(NSString *)value forKey:(NSString *)key
Set Tesseract variable key to value . See http://www.sk-spell.sk.cx/tesseract-ocr-en-variables for a complete (but not up-to-date) list.
For instance, use tessedit_char_whitelist to restrict characters to a specific set.
-setImage:
- (void)setImage:(UIImage *)image
Set the image to recognize.
-setLanguage:
- (BOOL)setLanguage:(NSString *)language
Override the language defined with -initWithDataPath:language: .
-recognize
- (BOOL)recognize
Start text recognition. You might want to launch this process in background with NSObject 's -performSelectorInBackground:withObject: .
-recognizedText
- (NSString *)recognizedText
Get the text extracted from the image.
-clear
- (void) clear
Clears Tesseract object after text has been recognized from image. Preventing memory leaks.
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