官方參考資料說明： tesseract 依賴庫: (https://github.com/tesseract-ocr/tesseract/wiki/Compiling#linux) leptonica 依賴庫: ( http://www.leptonica.org/source/README.htm ...
官方參考資料說明： tesseract 依賴庫: (https://github.com/tesseract-ocr/tesseract/wiki/Compiling#linux)
leptonica 依賴庫: ( http://www.leptonica.org/source/README.html )
交叉編譯 tesseract (以 tesseract 3.01 為例) 說明： 1. 嵌入式環境：mips架構， linux 3.08 2. 交叉工具鏈： mips-linux-gnu- 3.工具鏈路徑： /home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/ 一、依賴庫： 依賴庫: (官方有說明：https://github.com/tesseract-ocr/tesseract/wiki/Compiling#linux) 1. leptonica-1.67 > 其依賴庫: (官方說明：http://www.leptonica.org/source/README.html) (1) libz (建議版本zlib_1.2.3, 實測zlib_1.2.8也可) (2) libjpeg_9.0 (使tesseract支持jpeg，pbm圖片格式) (3) 如需支持其他圖片格式如tif，需要安裝其他庫libtiif 二、交叉編譯 leptonica-1.67 1. 交叉編譯 libjpeg_9.0 （1）mkdir tmp （2）./configure --host=mips-linux-gnu --target=mips-linux-gnu --prefix=$PWD/tmp CC=mips-linux-gnu-gcc CXX=mips-linux-gnu-g++ CFLAGS=-I/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/include LDFLAGS=-L/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/lib （3）make -j4 （4）make install （5）把tmp/下的include頭文件和庫文件lib複製到 /home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/include /home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/lib 工具鏈下 2. mkdir tmp 3. ./configure --host=mips-linux-gnu --target=mips-linux-gnu --prefix=$PWD/tmp CC=mips-linux-gnu-gcc CXX=mips-linux-gnu-g++ CFLAGS=-I/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/include LDFLAGS=-L/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/lib --with-jpeg (表示添加jpeg庫) --includedir=/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/include --libdir=/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/lib 其中： --includedir= 表示頭文件安裝目錄 --libdir= 表示庫安裝目錄 必需配置，否則會找不到庫文件，導致編譯不通過 4. 鏈接庫環境變數 export LD_LIBRARY_PATH=/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216 :/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/lib 5. make -j4 出現錯誤： /home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/bin/../lib/gcc/mips-linux-gnu/4.7.2/../../../../mips-linux-gnu/bin/ld: warning: libz.so.1, needed by ./.libs/liblept.so, not found (try using -rpath or -rpath-link) ./.libs/liblept.so: undefined reference to `inflate' ./.libs/liblept.so: undefined reference to `powf' ./.libs/liblept.so: undefined reference to `ceil' ./.libs/liblept.so: undefined reference to `atan2' ./.libs/liblept.so: undefined reference to `expf' ./.libs/liblept.so: undefined reference to `deflate' ./.libs/liblept.so: undefined reference to `floorf' ./.libs/liblept.so: undefined reference to `deflateInit_' ./.libs/liblept.so: undefined reference to `sin' ./.libs/liblept.so: undefined reference to `inflateEnd' ./.libs/liblept.so: undefined reference to `atan' ./.libs/liblept.so: undefined reference to `deflateEnd' ./.libs/liblept.so: undefined reference to `tan' ./.libs/liblept.so: undefined reference to `inflateInit_' ./.libs/liblept.so: undefined reference to `cos' ./.libs/liblept.so: undefined reference to `log' ./.libs/liblept.so: undefined reference to `sqrt' collect2: error: ld returned 1 exit status 原因：找不到libz庫，缺少math庫 解決：修改 Makefile 對於當前路徑下 src/Makefile 和 Makefile: （1） LIBS = -> LIBS = -lm （2） ZLIB_LIBS = -> ZLIB_LIBS = -lz （3） LDFLAGS = -L/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/mips-linux-gnu/libc/lib -L/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/lib 6. make install 7. 把tmp/下的include頭文件和庫文件lib複製到 /home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/include /home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/lib 工具鏈下（如已配置 --includedir --libdir， 則make install時已經安裝到以上目錄) 三、交叉編譯tesseract 3.01 1. ./autogen.sh 2. mkdir tmp 3. ./configure --host=mips-linux-gnu --target=mips-linux-gnu --prefix=$PWD/tmp CC=mips-linux-gnu-gcc CXX=mips-linux-gnu-g++ CFLAGS=-I/home/newton_linux/prebuilts/toolchains/mips-gcc472- glibc216/include LDFLAGS=-L/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/lib 報錯： checking for leptonica... configure: error: leptonica not found: 修改為： ./configure --host=mips-linux-gnu --target=mips-linux-gnu --prefix=$PWD/tmp CC=mips-linux-gnu-gcc CXX=mips-linux-gnu-g++ CFLAGS=-I/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/include LDFLAGS=-L/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/lib LIBLEPT_HEADERSDIR=/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/include （指定leptonica庫路徑） 如果再報錯： checking for leptonica... yes checking for pixCreate in -llept... no configure: error: leptonica library missing 則刪除 configure 文件中的以下內容的帶”*“的行 * if test "x$ac_cv_lib_lept_pixCreate" = xyes; then : cat >>confdefs.h <<_ACEOF #define HAVE_LIBLEPT 1 _ACEOF LIBS="-llept $LIBS" * else * as_fn_error $? "leptonica library missing" "$LINENO" 5 * fi 4. 鏈接庫環境變數不變 export LD_LIBRARY_PATH=/home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216: /home/newton_linux/prebuilts/toolchains/mips-gcc472-glibc216/lib 5. make -j4 出現錯誤： svutil.cpp: In static member function 'static void SVSync::StartProcess(const char*, const char*)': svutil.cpp:89:18: error: 'fork' was not declared in this scope svutil.cpp:119:28: error: 'execvp' was not declared in this scope svutil.cpp: In member function 'void SVNetwork::Close()': svutil.cpp:262:16: error: 'close' was not declared in this scope svutil.cpp: In constructor 'SVNetwork::SVNetwork(const char*, int)': svutil.cpp:417:14: error: 'sleep' was not declared in this scope 原因：無對應頭文件 解決： svutil.cpp 文件開始出添加頭文件： #include <unistd.h> 6. make install 四、開發板上使用tesseract 1. 分別把tesseract、leptonica、libjpeg_9、libz的tmp/下的include頭文件和庫文件lib複製到開發板/include和/lib目錄下 2. 在開發板上設置語言數據路徑： export TESSDATA_PREFIX=/alg 即把語言數據文件放置在/alg/tessdata之下 3. 開發板上執行： tesseract xxx.jpg out -l eng
