Searching \ for '[TECH] Whiteboard image extraction' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=whiteboard+image
Search entire site for: 'Whiteboard image extraction'.

Exact match. Not showing close matches.
PICList Thread
'[TECH] Whiteboard image extraction'
2009\01\31@125945 by olin piclist

face picon face
Philip Pemberton wrote:
> Speaking of whiteboard image extraction.. I've been (slowly) hacking
> away at a program that takes a JPEG file containing a photo of a
> whiteboard, removes the brightness variations caused by light shining
> on it, makes the background pure white, and enhances the contrast so
> you can see the text properly.

I've captured whiteboard images a number of times with great success using
two pictures.  Set the camera on a tripod, take the first picture, erase the
board, then take the second picture with the same lighting and the camera in
the same position.  A little image subtraction and scaling with existing
image manipulation programs and you get a very nice copy of the whiteboard
scribbles.


********************************************************************
Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.

2009\01\31@134613 by Vitaliy

flavicon
face
"Olin Lathrop" wrote:
> Philip Pemberton wrote:
>> Speaking of whiteboard image extraction.. I've been (slowly) hacking
>> away at a program that takes a JPEG file containing a photo of a
>> whiteboard, removes the brightness variations caused by light shining
>> on it, makes the background pure white, and enhances the contrast so
>> you can see the text properly.
>
> I've captured whiteboard images a number of times with great success using
> two pictures.  Set the camera on a tripod, take the first picture, erase
> the
> board, then take the second picture with the same lighting and the camera
> in
> the same position.  A little image subtraction and scaling with existing
> image manipulation programs and you get a very nice copy of the whiteboard
> scribbles.

We don't have room for a tripod in the conference room, and it is just more
convenient to grab the camera, and snap a picture. The whole process (from
taking a picture to getting the printout) takes an average of three minutes.
Most of that time is spent walking. :)

It's one of those "if it works, why fix it?" situations -- the whiteboard is
well-lit, when you crank up brightness/contrast in MS Photo Editor, it
produces crisp text on a black background. I'll try to post an example one
of these days.

Vitaliy

2009\01\31@143827 by Debbie

flavicon
face

--- On Sun, 1/2/09, Vitaliy <spam_OUTspamTakeThisOuTspammaksimov.org> wrote:

"Olin Lathrop" wrote:
> Philip Pemberton wrote:
>> Speaking of whiteboard image extraction.. I've been (slowly) hacking
>> away at a program that takes a JPEG file containing a photo of a
>> whiteboard, removes the brightness variations caused by light shining
>> on it, makes the background pure white, and enhances the contrast so
>> you can see the text properly.

If you need to make a line (vector) drawing from a bitmap/jpeg picture of the whiteboard, maybe try the auto-trace/live-trace(?) function in Illustrator?

My 20c worth - Debbie :)


     Make Yahoo!7 your homepage and win a trip to the Quiksilver Pro. Find out more

2009\01\31@144724 by Neil Cherry

flavicon
face
Vitaliy wrote:
{Quote hidden}

One thing I've found useful is to use the video camera instead of the still
camera. It seems to get more information and I can't keep a camera very
still.

--
Linux Home Automation         Neil Cherry       .....ncherryKILLspamspam@spam@linuxha.com
http://www.linuxha.com/                         Main site
http://linuxha.blogspot.com/                    My HA Blog
Author of:            Linux Smart Homes For Dummies

2009\01\31@153437 by olin piclist

face picon face
Vitaliy wrote:
> It's one of those "if it works, why fix it?" situations -- the
> whiteboard is well-lit, when you crank up brightness/contrast in MS
> Photo Editor, it produces crisp text on a black background. I'll try
> to post an example one of these days.

I never said you should change your way, only described a way that has
produced very nice results for me in the past.  I put one example at
http://www.embedinc.com/temp/board.tif.


********************************************************************
Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.

2009\01\31@160633 by Ian Smith

flavicon
face
On Sat, 31 Jan 2009, Neil Cherry wrote:
> One thing I've found useful is to use the video camera instead of the still
> camera. It seems to get more information and I can't keep a camera very
> still.

The biggest drawback with digital image sensors is they are not very
sensitive to light, so they require long esposure times which leads to
blurry images.

The reason a video camera usually gives better images is that the sensors
tend to be larger, allowing more light to hit each cell, and the
resolution is much smaller.  Think 1 megapxel vs 10 megapixels.  Much less
noise.

One thing to try is set your camera to the highest ISO setting, and reduce
the resolution down.  You loose resolution to gain sharpness.

--
Ian Smith
http://www.ian.org

2009\01\31@164128 by Vitaliy

flavicon
face
"Olin Lathrop" wrote:
> I never said you should change your way, only described a way that has
> produced very nice results for me in the past.  I put one example at
> http://www.embedinc.com/temp/board.tif.

It looks great.

What are the numbers next to the to-do items? Ratings in terms of
difficulty?

What do the numbers next to the names mean? Amount of work accomplished?

Vitaliy

2009\01\31@165436 by Alan B. Pearce

face picon face
>What are the numbers next to the to-do items?
>Ratings in terms of difficulty?
>
>What do the numbers next to the names mean?
>Amount of work accomplished?

I took them to be priorities and assignments of jobs to people.

2009\01\31@172248 by Vitaliy

flavicon
face
Alan B. Pearce wrote:
> >What are the numbers next to the to-do items?
>>Ratings in terms of difficulty?
>>
>>What do the numbers next to the names mean?
>>Amount of work accomplished?
>
> I took them to be priorities and assignments of jobs to people.

I don't think they can be assignments of jobs to people, the numbers repeat.
Priorities are usually not expressed as fractional numbers.

In Agile/SCRUM/XP they sometimes assign "points" to tasks (the point system
is relative, and unitless). So for example, if you have three tasks, and
Task A is twice as difficult as Task B, which in turn is twice as difficult
as Task C, the points would be assigned thus:

Task A: 4
Task B: 2
Task C: 1

If you have Task D that is considered to be three times as hard as Task B,
it would get assigned 6 points.

What this allows one to chart the team's progress (how many "points" were
done in a particular week). Last I heard, this practice has been abandoned
by some, in favor of the old way of assigning the number of hours to each
task.

Vitaliy

2009\01\31@174636 by olin piclist

face picon face
Vitaliy wrote:
> What are the numbers next to the to-do items? Ratings in terms of
> difficulty?

Cans of Jolt required for completion.

> What do the numbers next to the names mean? Amount of work
> accomplished?

Number of days docked for going home on weekends, attempts to remove leg
shackles, that sort of stuff.

Seriously, this is just a example of whiteboard capture.  The project is
long over, but I don't want to give information about it.


********************************************************************
Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.

2009\01\31@232810 by William \Chops\ Westfield

face picon face

On Jan 31, 2009, at 2:46 PM, Olin Lathrop wrote:

>> What are the numbers next to the to-do items? Ratings in terms of
>> difficulty?
>
> Cans of Jolt required for completion.

That's funny.  I've considered that I might be able to charge for  
consulting by counting the number of cans of Dr Pepper consumed; that  
providing some sort of balancing influence between time spent and  
intensity involved that might otherwise be lacking.  I suspect  
customers wouldn't go for it though...

BillW


'[TECH] Whiteboard image extraction'
2009\02\01@182016 by Vitaliy
flavicon
face
William "Chops" Westfield wrote:
>>> What are the numbers next to the to-do items? Ratings in terms of
>>> difficulty?
>>
>> Cans of Jolt required for completion.
>
> That's funny.  I've considered that I might be able to charge for
> consulting by counting the number of cans of Dr Pepper consumed; that
> providing some sort of balancing influence between time spent and
> intensity involved that might otherwise be lacking.  I suspect
> customers wouldn't go for it though...

:-)

Do you think it would be possible to create a scale of intensity, based on
the type of drink consumed?

I don't drink Jolt, and very rarely dring Dr. Pepper, but I find that when
things start to get difficult I switch from tea to Coke, and eventually to
extra-sweet strong coffee.

Vitaliy

More... (looser matching)
- Last day of these posts
- In 2009 , 2010 only
- Today
- New search...