Open Source Document Management System | OpenKM

How can we enable Full Text Search in PDF files which contains images in it. We have tried PDF.Force.OCR also but it didnt work.
Is tessarect engine is capable of doing such kind of PDF files?

Kindly suggest.

this could be a image resolucion problem, sometimes if images has low relution then are not able to extract keyword ( then should be used non open source ocr engine ). One way to test it, is extract the pdf image and then test tesseract from terminal.