TTesseractOCR4 is a Object Pascal binding for tesseract-ocr 4.x - an optical character recognition engine.
Examples were tested in Delphi 10.2.3 (32-bit build for Windows) and Lazarus 1.8 (32-bit build for Windows and Linux in Ubuntu 18.04).
- Clone this repository to a local folder.
- Obtain Tesseract 4.x binaries. I recommend using latest version, build from master branch of the tesseract project.
- Windows: Precompiled binaries can be found in
lib\tesseractocr-master.zip
. Unpack and copy all DLL files tobin\
.
Microsoft Visual C 2017 Redistributable x86 must be installed on the computer. - Linux:
sudo apt install tesseract-ocr
.
This will also install required shared libraries (liblept5 and libtesseract4). - Common: Set
{$DEFINE USE_CPPAN_BINARIES}
accordingly intesseractocr.consts.pas
if using Tesseract libraries built with CPPAN (defined as default).
- Download trained language data files from tesseract-ocr/tessdata/ to
bin\tessdata
.
All examples in this repository require English data file (eng.traineddata
).
Additionallyexamples\delphi-console-pdfconvert
example requiresosd.traineddata
andpdf.ttf
files.
Linux: Tested with language data from tesseract-ocr/tessdata_fast - Open and compile example project:
-
examples\delphi-console-simple
. Recognize text insamples\eng-text.png
and write to console output -
examples\delphi-vcl-image
4 tabs:- Image: View input image
- Text: Recognized text coded as UTF-8
- HOCR: Recognized text in HTML format
- Layout: View page layout (paragraphs, text lines, words...)
-
examples\delphi-console-pdfconvert
. Convertsamples\multi-page.tif
(multiple page image file) to a PDF file -
examples\lazarus-console-simple
.examples\delphi-console-simple
for Lazarus
-
MIT