PureBasic Interface to OpenCV

bbanelli · **Posted:** Fri Dec 14, 2018 1:39 pm

JHPJHP is live and kicking!!!

Thank you so much for maintenance!

Bruno

JHPJHP · **Joined:** Sat Oct 09, 2010 3:47 am **Posts:** 1595

Hi bbanelli,

Thank you for your kind words.

bbanelli wrote:

Thank you so much for maintenance!

I am again feeling the coding bug, and maintenance was just the thing to clear out the cobwebs.

I've just posted a new OpenCV plus application, that will capture and record a users window actions to an AVI video file: Record Window
- can also be configured as a PureBasic Tool

Cheers!

AAT · **Posted:** Tue Dec 25, 2018 2:56 pm

JHPJHP, Merry Christmas!
I wish you health, good luck and new interesting projects!

JHPJHP · **Joined:** Sat Oct 09, 2010 3:47 am **Posts:** 1595

Hi AAT,

AAT wrote:

JHPJHP, Merry Christmas!
I wish you health, good luck and new interesting projects!

Thank you my friend.

Have a very Merry Christmas and a Happy New Year.

NB*: I will probably just continue creating small applications around the OpenCV interface; there are so many possibilities.

JHPJHP · **Joined:** Sat Oct 09, 2010 3:47 am **Posts:** 1595

Updated:
- added back the Microsoft Visual C++ Runtime Libraries to the various Windows packages
-- originally suggested by acreis in this post

cvCreateVideoWriter Windows examples now set to use the XVID codec.
- install: only the DIVX option is required
- START > XVID > Encoder Config > Other Options... > Display encoding status (remove checkbox)

----------------------------------------------------------

Removed DPI Awareness functions from the Windows packages.
- switched to Windows API instead of using PureBasic's built-in ExamineDesktops

NB*: Multiple global find/replace calls were performed with limited testing; please report any problems.

JHPJHP · **Joined:** Sat Oct 09, 2010 3:47 am **Posts:** 1595

Hi Michael Vogel,

Question taken from this post: https://www.purebasic.fr/english/viewtopic.php?p=534605#p534605

Michael Vogel wrote:

Seems that the OpenCV libraries are doing a lot of stuff...

Some days ago I started to write a simple stretch function to be used as an external program for the Faststone Viewer to correct the perspective of photos. It uses the magick library (parameter -distort Perspective) for now but the lib is very large for this tiny stuff...

...can you tell me how to do a simple stretch for calculating a trapezium to a rectangle (or vice versa)?

Download the following OpenCV package from my website: OpenCV_2.4.13.6_WIN_32_SRC_(main)
- obviously the entire interface isn't necessary, but that can be worked out later if you decide to go the OpenCV route

See the following examples:
- cv_warpperspective_1.pb, cv_warpperspective_2.pb

This should get you started, but if you need additional help please don't hesitate to post back.

Michael Vogel · **Joined:** Thu Feb 09, 2006 11:27 pm **Posts:** 2456

Cool JHPJHP, will take a look at this very soon :wink:

JHPJHP · **Joined:** Sat Oct 09, 2010 3:47 am **Posts:** 1595

Updated (Linux Packages):
- fixed a path problem
- fixed the webcam examples
- fixed window close event

Path Problem
After updating to Ubuntu 18.04.2 LTS (Bionic Beaver) none of the examples worked.

Webcam Examples
Before today I did not have a fully functional (VMWare) webcam; testing the webcam examples was non-existent.

Window Close Event
Programmatically closing one window to open another would exit the main loop.

----------------------------------------------------------------

Updated:
- patched the webcam examples (all packages)

Webcam Examples
I was trying to force a size restriction, not taking into account the scale factor.
Changed the way the webcam is attached; while working with two webcams I noticed a problem.

Mesa · **Joined:** Fri Feb 24, 2012 10:19 am **Posts:** 116

Hi,

It's about your Tesseract example.

When i compile the cv_OCR_confidence.pb file, everything works fine.
But when i want to use the french language, i've got an error.

I downloaded the "fra.traineddata" from github (https://github.com/tesseract-ocr/tesser ... Data-Files) in the "ocr\binaries\tesseract\tessdata\" path

I changed the line

Code:

"hAPI = TesseractInit(#PSM_AUTO, #OEM_TESSERACT_ONLY, #PB_Compiler_FilePath + "binaries/tesseract/tessdata/", "eng", #Null$)"

into

Code:

"hAPI = TesseractInit(#PSM_AUTO, #OEM_TESSERACT_ONLY, #PB_Compiler_FilePath + "binaries/tesseract/tessdata/", "fra", #Null$)"

and the compiler displays an invalid memory access in the line

Code:

" If TessBaseAPIInit1(hAPI, dictionarypath, language, OEM, @CFG, 1) : TessBaseAPIEnd(hAPI) : Else : ProcedureReturn hAPI : EndIf"

in the pb_tesseract.pb file

An idea, to change the language ?

Thanks.

Mesa.

JHPJHP · **Joined:** Sat Oct 09, 2010 3:47 am **Posts:** 1595

Hi Mesa,

I believe this is the same issue Morty posted awhile back...

… The memory access error is due to an incompatible traineddata version; download the required language file from the following link: Data Files for Version 3.02

NB*: Another option is to replace the binaries with the current version, but then you might have to update parts of the code.

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