Tesseract Example for Iphone

Question

I have compiled tesseract for using it in xcode following: http://iphone.olipion.com/cross-compilation/tesseract-ocr

I obtain the .a file, import it as framework in the iphone project, and update the header search path for tesseract header files.

So now I need a simple example in order to get start. I can't find anything in http :// code.google.com/p/tesseract-ocr/ or by googling.

Anyone can help me give me a starting point (a code snippet)..?! Many ThankS!

-- Later i found this code:

#include "baseapi.h"

---

TessBaseAPI::InitWithLanguage(NULL, NULL, language, NULL, false, 0, NULL); char* text = TessBaseAPI::TesseractRect(imagedata, bytes_per_pixel, bytes_per_line, 0, 0, width, height); TessBaseAPI::End();

---

but when I try to compile for device (only inserting include statement without the code above) i get the following:

error:syntax error before 'PAGE_RES' warning:type defaults to 'int' in declaration of 'PAGE_RES' warning:data definition has no type or storage class

and so on with BLOCK_LIST, IMAGE etc.

---

if compile for simulator i get

error: expected '=',',',','asm' or 'attribute' before 'PAGE_RES' and so on with BLOCK_LIST, IMAGE and TessBaseAPI

--- Other Update: I found solution for include problem: Where the include occurs must be rename the file.m in .mm extension because we have to tell xcode that we have to use objective-c and c++ together.

Answer 1

http://github.com/nolanbrown/Tesseract-iPhone-Demo

OCRDemo is a demo application that utilizes the Tesseract library (http://code.google.com/p/tesseract-ocr/) as a static library compiled under Mac OS 10.6 using the shell script found at http://robertcarlsen.net/2009/07/15/cross-compiling-for-iphone-dev-884.

The program is only meant to provide a demonstration of the OCR library and it’s abilities on the iPhone, the program is not optimized in any way...

Answer 2

you'll need to update SDKROOT, CPPFLAGS and CXX variables. For example, here's the relevant part of my build script, modified to work with 4.0:

export SDKROOT=$DEVROOT/SDKs/iPhoneOS4.0.sdk
export PATH=$DEVROOT/usr/bin:$PATH
# Set up relevant environment variables
export CPPFLAGS="-I$SDKROOT/usr/lib/gcc/arm-apple-darwin10/4.0.1/
include/ -I$SDKROOT/usr/include/ -miphoneos-version-min=4.0"
export CFLAGS="$CPPFLAGS -arch armv6 -pipe -no-cpp-precomp -isysroot
$SDKROOT"
export CPP="$DEVROOT/usr/bin/cpp $CPPFLAGS"
export CXXFLAGS="$CFLAGS"

Dynamic library location generated by the Unix package

 LIBPATH=$LIBFILE.dylib
    LIBNAME=`basename $LIBPATH`

export LDFLAGS="-L$SDKROOT/usr/lib/ -Wl,-
dylib_install_name,@executable_path/$LIBNAME"

Static library that will be generated for ARM

LIBPATH_static=$LIBFILE.a
LIBNAME_static=`basename $LIBPATH_static`
# TODO: add custom flags as necessary for package
./configure CXX=$DEVROOT/usr/bin/arm-apple-darwin10-g++-4.0.1 CC=
$DEVROOT/usr/bin/arm-apple-darwin10-gcc-4.0.1 LD=$DEVROOT/usr/bin/ld --host=arm-apple-darwin