[Chicago] OpenALPR - Transformations

[Michael Tamillow]

Fair enough Adam.

The first thing that crossed my mind was "license plate... data... this sounds illegal." I hoped that crossed a few other people's minds.

Sarcasm is my way of dealing with the absurdity of life.

The competing technologies/ application of technology debate is as old as punch cards and vacuum tubes, and as silly as the application of either of those technologies today.

That's my honest opinion.

Sent from my iPhone

> On Nov 4, 2016, at 10:07 PM, Carl Karsten <carl at personnelware.com> wrote:
> 
> This is about a year old, but it is a fun talk:
> 
> http://pyvideo.org/pycon-za-2015/community-security-anpr-automated-number-plate.html
> 
>> On Fri, Nov 4, 2016 at 2:38 PM, Robare, Phillip (TEKSystems) <proba at allstate.com> wrote:
>> Some links you may find useful below.  I am surprised ALPR doesn't do this already.
>> 
>> The problems reading license plates by humans have resulted in deaths (due to hits on mis-entered license numbers in the context of traffic stops).  I hope you are getting a better feeling of how we need to be careful with the tasks given to our new robotic overlords.
>> 
>> An interesting post from a couple years ago is "How to Build a Kick-Ass Mobile Document Scanner in Just 5 Minutes" (http://www.pyimagesearch.com/2014/09/01/build-kick-ass-mobile-document-scanner-just-5-minutes/) .  It covers sharpening the image, doing a perspective transformation and getting the document ready for OCR (but not the OCR step).
>> 
>> The book "Automate The Boring Stuff With Python" has a chapter on "Manipulating Images" that is online and covers how to do the manipulations with PIL (https://automatetheboringstuff.com/chapter17/).  This would be a good start.  If you are working on your project with Python 3 (if not, why not?) I believe Pillow has the same API.
>> 
>> There have been a number of github projects in the space of preparing scanned documents that I have seen over the years.  Unfortunately I can't find the best ones I remember so here are ones I found today:
>> Scantailor (https://github.com/scantailor/scantailor) is a large C++ project that appears to be very complete.  ImproveQuality (https://github.com/tesseract-ocr/tesseract/wiki/ImproveQuality) is also a cpp project meant for text scanning.
>> 
>> A mathematically interesting approach to deskewing is documented in http://www.ijstr.org/final-print/dec2013/An-Integrated-Skew-Detection-And-Correction-Using-Fast-Fourier-Transform-And-Dct.pdf where a Fast Fourier Transform is used to determine the skew without pre-analyzing the image to pull out text lines.
>> 
>> 
>> Phil Robare
>> 
>> 
>> -----Original Message-----
>> From: Chicago [mailto:chicago-bounces+proba=allstate.com at python.org] On Behalf Of Chris Vinzons
>> Sent: Thursday, November 03, 2016 2:52 PM
>> To: chicago at python.org
>> Subject: [Chicago] OpenALPR - Transformations
>> 
>> Hi,
>> 
>> I'm using OpenALPR to read still license plates, but the thing is that my sometimes that it doesn't read it correctly. I think this is because of the license plate is tilted. Is there a way to untilt it or is there some kind of training data I could do in python?
>> 
>> 
>> Thanks
>> 
>> Chris V
>> 
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> 
> 
> 
> -- 
> Carl K
> 
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