Thin Horizontal Lines visible within PDF file after OCR run

I print to PDF(Acrobat 9.1 Pro), from an imaging application where the images are stored and managed as 300dpi TIFF(Group 4) B&W.
The PDF file is produced with no issues.  At this time I run the OCR process to capture the type written data.  As the OCR process works it's way throught the file, the PDF is re-written with both OCR data and thin black horizontal lines every 2/3 of a inch down the page.
These lines will be saved with the file and print out.
How do I eliminate these lines?

I had this problem too.  I'm using Acrobat Pro 9.4 and after OCRing a doc it had horizontal lines running across the page.  We were able to fix it by first Optimizing the document and then OCRing it.
Document > Optimize Scanned PDF
When finished, Document > OCR Text Recognition > Recognize text using OCR
Hope this helps

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