目录

一、报错信息

二、安装依赖库并重新编译 leptonica

一、报错信息

$ tesseract --list-langs
Error in pixReadMemTiff: function not present
Error in pixReadMem: tiff: no pix returned
Error in pixaGenerateFontFromString: pix not made
Error in bmfCreate: font pixa not made
List of available languages (1):
eng

查看 version 信息，确实没看到 libpng 和 libtiff

$ tesseract -v          
tesseract 5.0.0-alpha-20201231-407-g52a8
 leptonica-1.81.1
  zlib 1.2.11
 Found AVX2
 Found AVX
 Found FMA
 Found SSE
 Found OpenMP 201511

二、安装依赖库并重新编译 leptonica

安装 libpng 和 libtiff

$ yum install libjpeg-devel libpng-devel libtiff-devel

重新编译 leptonica 并安装

$ cd leptonica-1.81.1
$ make && make install

查看 tesseract 的 version 信息，存在 libpng 和 libtiff 了

$ tesseract -v
tesseract 5.0.0-alpha-20201231-407-g52a8
 leptonica-1.81.1
  libjpeg 6b (libjpeg-turbo 1.5.3) : libpng 1.6.34 : libtiff 4.0.9 : zlib 1.2.11
 Found AVX2
 Found AVX
 Found FMA
 Found SSE
 Found OpenMP 201511

列出语言支持，不再报错。

$ tesseract --list-langs
List of available languages (1):
eng