#366 OCR does not occur for external PDF imported into NAPS2 containing PBM data.

[Tony Jones]

Steps:

1. Import existing PDF into NAPS2.
2. Select OCR/English.
3. Save PDF. Save is instantaneous. No OCR processing takes place. Resultant PDF contains no OCR.

If PBMs are extracted from PDF, converted to JPG and imported into NAPS2, there is OCR in resulting PDF too much loss and PDF size is 7x that containing PBM

pdfimages test.pdf base
dir
11/10/2017 10:33 AM 1,706,453 base-0000.pbm
11/10/2017 10:33 AM 1,591,702 base-0001.pbm
11/10/2017 10:28 AM 197,459 test.pdf

tesseract -v
tesseract 3.05.01
leptonica-1.74.1
libgif 4.1.6(?) : libjpeg 8d (libjpeg-turbo 1.5.0) : libpng 1.6.20 : libtiff 4
.0.6 : zlib 1.2.8 : libwebp 0.4.3 : libopenjp2 2.1.0

tesseract base-0000.pbm stdout
Warning. Invalid resolution 0 dpi. Using 70 instead.
SECTION

280

Table of Contents

TITLE PAGE

INTRODUCTION ....................................... 1-1
[ΓÇö1. PURPOSE OF INTERFACE POD .................. 1-1
[-2. DESCRIPTION OF INTERFACE POD ............. M
1-3. SPECIFICATIONS ................................ 1ΓÇö2
INSTALLATION ........................................ 2-1
2-1. GENERAL ....................................... 2-1
2-2. MAKING CONNECTIONS ........................ 2ΓÇö1
2-3. POWER CONNECTIONS ......................... 2-2
MICROPROCESSOR DATA ............................. 3-1
3-1. INTRODUCTION ................................. 3-1
3ΓÇö2. 280 SIGNALS .................................... 3-l
3-3. STATUS/CONTROL LINES

AND ADDRESS SPACE ASSIGNMENT ........... 3-1
3-4. Introduction .................................... 3-4
3-5. Bit Assignment - Status Lines ..................... 3-4
3-6. User- Writcablc Control Lines ..................... 3-4
3-7. Bit Assignment - Control Lines .................... 3-5
3-8. Address Space Assignment ........................ 3-5
3-9. FORCING AND INTERRUPT LINES .............. 3-6
3-10. LINES ENABLED DURING TROUBLESHOOTER

SETUP ........................................... 3-6
3-11. NON-DETECTABLE 280 SIGNALS ................ 3-7
3-12. MARGINAL UUT PROBLEMS .................... -3-7
3ΓÇö13. Introduction .................................... 3.-7
3ΓÇö14. UUT Operating Speed and Memory Access ......... 3-7
3-15. UUT Noise Levels ............................... 3-7
3-l6. Bus Loading .................................... 3-7
3-17. Clock Loading .................................. 3-7
3-l8. POD DRIVE CAPABILITY ........................ 3-8
3~l9. POWER FAILURE DETECTION LIMITS .......... 3-8

1' (continued on page ii)

[Ben Olden-Cooligan]

This should be resolved in the latest version of NAPS2 (5.6.0).