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Make it compile on Debian 11, invert image for better recognition #104

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Make it compile on Debian 11, invert image for better recognition #104

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2cef408
remove support for Tesseract 2
Apr 25, 2023
eb45239
add support for C++ 11
Apr 25, 2023
149b34b
invert image for better recognition
Apr 25, 2023
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3 changes: 3 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,9 @@ project(vobsub2srt)

cmake_minimum_required(VERSION 2.6.4 FATAL_ERROR)

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED True)

set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/CMakeModules)

if(NOT CMAKE_BUILD_TYPE)
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14 changes: 2 additions & 12 deletions CMakeModules/FindTesseract.cmake
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Expand Up @@ -43,18 +43,8 @@ if(TESSERACT_DATA_PATH)
add_definitions(-DTESSERACT_DATA_PATH="${TESSERACT_DATA_PATH}")
endif()

set(CMAKE_REQUIRED_INCLUDES ${Tesseract_INCLUDE_DIR})
check_cxx_source_compiles(
"#include \"tesseract/baseapi.h\"
using namespace tesseract;
int main() {
}"
TESSERACT_NAMESPACE)
if(TESSERACT_NAMESPACE)
add_definitions("-DCONFIG_TESSERACT_NAMESPACE")
else()
message(WARNING "You are using an old Tesseract version. Support for Tesseract 2 is deprecated and will be removed in the future!")
endif()
add_definitions("-DCONFIG_TESSERACT_NAMESPACE")

list(REMOVE_ITEM CMAKE_REQUIRED_INCLUDES ${Tesseract_INCLUDE_DIR})

if(BUILD_STATIC)
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16 changes: 16 additions & 0 deletions src/vobsub2srt.c++
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Expand Up @@ -269,6 +269,22 @@ int main(int argc, char **argv) {
dump_pgm(subname, sub_counter, width, height, stride, image, image_size);
}

// for 4.x version use dark text on light background.
bool inverting_images = true;

if (inverting_images) {
int size_r = width * height;
unsigned char* image_rev = new unsigned char[size_r];
for (int i = 0; i < size_r; i++)
{
int val = static_cast<int>(image[i]);
unsigned char cz = (255 - val);
image_rev[i] = cz;
}

image = image_rev;
}

#ifdef CONFIG_TESSERACT_NAMESPACE
char *text = tess_base_api.TesseractRect(image, 1, stride, 0, 0, width, height);
#else
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