text: update cmake

modules/text/CMakeLists.txt

 set(the_description "Text Detection and Recognition")
-ocv_define_module(text opencv_ml opencv_highgui opencv_imgproc opencv_core opencv_features2d WRAP python)
+ocv_define_module(text opencv_ml opencv_imgproc opencv_core opencv_features2d OPTIONAL opencv_highgui WRAP python)
 
-set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR})
-
-find_package(Tesseract)
-if(Tesseract_FOUND)
+if(NOT CMAKE_CROSSCOMPILING OR OPENCV_FIND_TESSERACT)
+  set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
+  find_package(Tesseract QUIET)
+  if(Tesseract_FOUND)
     message(STATUS "Tesseract:   YES")
     set(HAVE_TESSERACT 1)
-else()
+    ocv_include_directories(${Tesseract_INCLUDE_DIR})
+    ocv_target_link_libraries(${the_module} ${Tesseract_LIBRARIES})
+  else()
     message(STATUS "Tesseract:   NO")
+  endif()
 endif()
 
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/text_config.hpp.in
                ${CMAKE_BINARY_DIR}/text_config.hpp @ONLY)
 
-include_directories(${CMAKE_CURRENT_BINARY_DIR})
-
-if(${Tesseract_FOUND})
-include_directories(${Tesseract_INCLUDE_DIR})
-endif()
-
-if(${Tesseract_FOUND})
-  target_link_libraries(opencv_text ${Tesseract_LIBS})
-endif()
+ocv_include_directories(${CMAKE_CURRENT_BINARY_DIR})

modules/text/FindTesseract.cmake

-# Tesseract OCR
-unset(Tesseract_FOUND)
-
-find_path(Tesseract_INCLUDE_DIR tesseract/baseapi.h
-  HINTS
-  /usr/include
-  /usr/local/include)
-
-find_library(Tesseract_LIBRARY NAMES tesseract
-  HINTS
-  /usr/lib
-  /usr/local/lib)
-
-find_library(Lept_LIBRARY NAMES lept
-  HINTS
-  /usr/lib
-  /usr/local/lib)
-
-set(Tesseract_LIBS ${Tesseract_LIBRARY} ${Lept_LIBRARY})
-if(Tesseract_LIBS AND Tesseract_INCLUDE_DIR)
-    set(Tesseract_FOUND 1)
-endif()
-
-        

modules/text/cmake/FindTesseract.cmake

+# Tesseract OCR
+if(COMMAND pkg_check_modules)
+  pkg_check_modules(Tesseract tesseract lept)
+endif()
+if(NOT Tesseract_FOUND)
+  find_path(Tesseract_INCLUDE_DIR tesseract/baseapi.h
+    HINTS
+    /usr/local/include)
+
+  find_library(Tesseract_LIBRARY NAMES tesseract
+    HINTS
+    /usr/local/lib)
+
+  find_library(Lept_LIBRARY NAMES lept
+    HINTS
+    /usr/local/lib)
+
+  if(Tesseract_INCLUDE_DIR AND Tesseract_LIBRARY AND Lept_LIBRARY)
+    set(Tesseract_INCLUDE_DIRS ${Tesseract_INCLUDE_DIR})
+    set(Tesseract_LIBRARIES ${Tesseract_LIBRARY} ${Lept_LIBRARY})
+    set(Tesseract_FOUND 1)
+  endif()
+endif()