Tesseract API Basic Example项目

程序员文章站 2023-12-27 09:41:39

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参考链接：
https://www.jianshu.com/p/a53c732d8da3
https://github.com/tesseract-ocr/tesseract/wiki/APIExample

tesseract项目的生成见之前的文章：手把手教你win7_64位+cmake+vs2015编译tesseract5.0.0

【集中存放tesseract库内容】

1.vs2015打开tesseract.sln。右键install，生成——仅生成install
2.将C:\Program Files (x86)下的tesseract文件夹剪切到桌面，此时里面已经有bin、include、lib、cmake文件夹
3.vs2015打开leptonica.sln。右键install，生成——仅生成install
4.将C:\Program Files (x86)下的leptonica文件夹剪切到桌面，此时里面已经有bin、include、lib、cmake文件夹
bin:
1.去原来的leptonica文件夹里搜索.dll，将两个leptonica的.dll复制粘贴进来
2.去原来的tesseract文件夹里搜索.dll，将两个tesseract的.dll复制粘贴进来
3.去原来的tesseract文件夹里搜索.pdb，将两个tesseract的.pdb复制粘贴进来
4.去原来的png文件夹里搜索.dll，将两个png的.dll复制粘贴进来
5.去原来的zlib文件夹里搜索.dll，将两个zlib的.dll复制粘贴进来
6.去原来的tiff文件夹里搜索.dll，将四个tiff的.dll复制粘贴进来
注：原来就有的tesseract.exe不要删掉
注：4、5、6按照教程本来没有，但是最后运行的时候提醒我需要，所以复制粘贴了进来
include:
1.把桌面上leptonica文件夹里include文件夹里的leptonica文件夹复制粘贴到桌面上tesseract下的include文件夹里
lib:
1.去原来的leptonica文件夹里搜索.lib，将两个leptonica的.lib复制粘贴进来
2.去原来的tesseract文件夹里搜索.lib，将两个tesseract的.lib复制粘贴进来
3.去原来的tiff文件夹里搜索.lib，将两个tiff的.lib复制粘贴进来
tessdata:
1.在桌面上的tesseract里新建tessdata文件夹
2.在tessdata文件夹里放置中英文语言包
cmake:
1.把桌面上leptonica下的cmake文件里的复制到桌面上tesseract下的cmake文件夹里

【cmake相关文件编写】

1.在桌面上的tesseract文件夹里新建TesseractConfig.cmake，内容如下：

# ===================================================================================
#  The Tesseract CMake configuration file
#
#  Usage from an external project:
#    In your CMakeLists.txt, add these lines:
#
#    FIND_PACKAGE(Tesseract REQUIRED)
#    TARGET_LINK_LIBRARIES(MY_TARGET_NAME ${Tesseract_LIBS})
#
#    This file will define the following variables:
#      - Tesseract_LIBS                     : The list of libraries to link against.
#      - Tesseract_LIB_DIR                  : The directory(es) where lib files are. Calling 
#                                             LINK_DIRECTORIES with this path is NOT needed.
#      - Tesseract_INCLUDE_DIRS             : The Tesseract include directories.
#      - Tesseract_VERSION                  : The version of this Tesseract build. Example: "2.4.0"
#      - Tesseract_VERSION_MAJOR            : Major version part of Tesseract_VERSION. Example: "2"
#      - Tesseract_VERSION_MINOR            : Minor version part of Tesseract_VERSION. Example: "4"
#      - Tesseract_VERSION_PATCH            : Patch version part of Tesseract_VERSION. Example: "0"
#
#    Advanced variables:
#      - Tesseract_CONFIG_PATH
#
# ===================================================================================

set(Tesseract_VERSION_MAJOR 5)
set(Tesseract_VERSION_MINOR 0)
set(Tesseract_VERSION_PATCH 0)
set(Tesseract_VERSION ${Tesseract_VERSION_MAJOR}.${Tesseract_VERSION_MINOR}.${Tesseract_VERSION_PATCH})

get_filename_component(Tesseract_CONFIG_PATH "${CMAKE_CURRENT_LIST_FILE}" PATH CACHE)
set(Tesseract_LIB_DIR "${Tesseract_CONFIG_PATH}/lib")
set(Tesseract_INCLUDE_DIRS "${Tesseract_CONFIG_PATH}/include")

set(Tesseract_LIBS_DBG "leptonica-1.76.0d.lib" "tesseract50d.lib")
set(Tesseract_LIBS_OPT "leptonica-1.76.0.lib" "tesseract50.lib")
foreach(__tesslib ${Tesseract_LIBS_DBG})
  list(APPEND Tesseract_LIBS debug "${Tesseract_LIB_DIR}/${__tesslib}")
endforeach()
foreach(__tesslib ${Tesseract_LIBS_OPT})
  list(APPEND Tesseract_LIBS optimized "${Tesseract_LIB_DIR}/${__tesslib}")
endforeach()

set(Tesseract_FOUND TRUE CACHE BOOL "" FORCE)

2.桌面上新建文件夹samples，里面新建文件夹Basic-example和txt文件CMakeLists.txt
3.打开CMakeLists.txt，设置内容为

cmake_minimum_required(VERSION 3.0)
project(tesseract-api-examples)
add_subdirectory(Basic-example)

4.进入文件夹Basic-example，新建文件Basic-example.cpp和CMakeLists.txt
5.打开Basic-example.cpp，设置内容为

#include <tesseract/baseapi.h>
#include <leptonica/allheaders.h>

int main()
{
    char *outText;
    
    tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
    // Initialize tesseract-ocr with English, without specifying tessdata path
    if (api->Init(NULL, "eng")){
        fprintf(stderr, "Could not initialize tesseract.\n");
        exit(1);
    }
    
    // Open input image with leptonica library
    Pix *image = pixRead("C:\\Users\\Administrator.WIN-R4NP32A0422\\Desktop\\pics\\phototest.tif");
    api->SetImage(image);
    // Get OCR result
    outText = api->GetUTF8Text();
    printf("OCR output:\n%s", outText);
    
    // Destroy used object and release memory
    api->End();
    delete [] outText;
    pixDestroy(&image);
    
    return 0;
}

6.打开CMakeLists.txt，设置内容为

set(the_target "Basic-example")
find_package(Tesseract REQUIRED)
aux_source_directory(. SRC_LIST)
include_directories(${Tesseract_INCLUDE_DIRS})
add_executable(${the_target} ${SRC_LIST})
target_link_libraries(${the_target} ${Tesseract_LIBS})

【构建】

1.在samples文件夹下新建build文件夹
2.打开D:\studytesseractGit\0228_tesseract5.0\cmake-3.16.2-win64-x64\bin\cmake-gui.exe
设置：
源路径：C:/Users/Administrator.WIN-R4NP32A0422/Desktop/samples
目标路径：C:/Users/Administrator.WIN-R4NP32A0422/Desktop/samples/build
3.configure，选择vs2015，finish，等待
4.找到Tesseract_DIR那一行和Leptonica_DIR那一行，将桌面上tesseract的路径C:\Users\Administrator.WIN-R4NP32A0422\Desktop\tesseract放进去
5.configure，generate
6.打开C:\Users\Administrator.WIN-R4NP32A0422\Desktop\samples\build\tesseract-api-examples.sln
7.将Basic-example设定为启动项
8.生成——生成解决方案
9.将桌面上的tesseract的bin文件夹的路径C:\Users\Administrator.WIN-R4NP32A0422\Desktop\tesseract\bin放到环境变量path里面
10.新建环境变量TESSDATA_PREFIX，将tessdata的路径C:\Users\Administrator.WIN-R4NP32A0422\Desktop\tesseract\tessdata加进去
11.在Basic-example.exe处打开命令行，运行Basic-example
显示如下图：
Tesseract API Basic Example项目