HDTenEightyP/NetNews huggingface dataset:
From: jacky@cs.technion.ac.il (Jacky Romano)
Newsgroups: sci.image.processing
Subject: Finding the camera position out of known pixels in the image?
Date: 9 Sep 92 07:06:42 GMT
Organization: Technion, Israel Inst. Tech., Haifa Israel

Hi,
I'm not sure this is the correct place to put this question but:
I have an air-photo of a landscape, with some pixels (about 20)
which I know their world coordinates. I'm looking for an algorithm
which will find from this data the camera position and it's
orientation.

Please answer by E-mail, and I'll summerize upon request.
--
 ____              \               | Jacky Romano
   \  _____   ____  \   /          | Computer Science
    \ \    \  \      \-(_  \  \	   | Technion - IIT
  \__) \____)__\______)  \__\__\   | Haifa - Israel 
  ______________________________)  | Internet: jacky@isis.cs.technion.ac.il
                                   | Bitnet: jacky@techsel.bitnet
Newsgroups: sci.image.processing,comp.graphics,rec.arts.fine
From: mjm@monu6.cc.monash.edu.au (Mike McBain)
Subject: Re: Economist article on art museum imaging
Followup-To: poster
Summary: E-mail bounces
Organization: Monash University, Melb., Australia.
Date: Sun, 13 Sep 1992 23:50:29 GMT

In article <199209100253.AA15416@tuna.wang.com> IMAGING.CLUB@OFFICE.WANG.COM ("Imaging Club") writes:
>[ offer of Economist article on art museum imaging ]
>Michael.Willett@OFFICE.Wang.com

My e-mail to this address bounced. I am very interested in getting a copy of 
thius article. I am doing a study of the use of technology in museums and
art galleries..

-- 
---
Mike McBain                                 David Syme Faculty of Business
mjm@monu6.cc.monash.edu.au                  Monash University - Caulfield
+61 3 573 2646                              Australia    3145
From: coral@milton.u.washington.edu (Coral Bernier)
Newsgroups: sci.image.processing
Subject: intravascular ultrasound
Date: 8 Sep 92 17:56:26 GMT
Article-I.D.: u.1992Sep8.175626.12531
Organization: University of Washington, Seattle

I am working with intravascular ultrasound images and am trying
to either apply existing or develop new algorithms to do the
following:

(1) Identify circularity in the image (I am trying to identify
the physiologic center of the vessel to be used for image
registration and subsequent 3-D reconstruction)

(2) Use of beam pattern in deconvolution of the images (I have
generated images depicting point spread function of transducer)
These images highly resemble radar images and I would also appreciate
receiving any information on how antenna beam patterns are used in 
image processing.

Please post response to this newsgroup and/or respond by email
to the address below.

Thanks.
-----------------------------------------------------------------------
Coral Bernier				Center for Bioengineering, WD-12
coral@coral.bioeng.washington.edu	Univ of Washington
Phone: (206)685-2740			Seattle  WA 98195
Newsgroups: sci.image.processing
From: susanm@an.hp.com (Susan Margulies)
Subject: Non-Zero Phase Filters
Reply-To: susanm@hp-and.an.hp.com
Organization: Hewlett-Packard, Santa Clara Division
X-Newsreader: Tin 1.1.3 PL5
Date: Wed, 9 Sep 1992 20:40:09 GMT

After reading up on zero-phase FIR filters, I was wondering if 
there is any use for non-zero-phase filters in image processing?

From what I understand, non-zero-phase filters blur the images
to which they are applied.  Since low-pass non-zero-phase filters blur
high frequency info (edges), can this result be generalized for X-pass?
i.e. would an X-pass non-zero-phase filter blur info from the desired
stop band?  

Thanks,
Susan

P.S. I will summarize the responses from my original posting "2d-dft phase
     info" after an important thesis meeting tomorrow!

Newsgroups: sci.image.processing
From: herman@nosc.mil (John W. Herman)
Subject: Re: availability of lowtran 7?
Keywords: remote sensing, radiometric correction
Organization: Naval Ocean Systems Center, San Diego, CA
Date: Thu, 10 Sep 1992 20:45:18 GMT

henebry@matt.ksu.ksu.edu (Geoffrey M Henebry) writes:

>greetings!  does anyone have a lead on the availability of lowtran 7 over the
>net?  many thanks! -- g. henebry aka henebry@matt.ksu.edu

Isn't LOWTRAN a commercial product??
Newsgroups: sci.image.processing,comp.graphics,rec.arts.fine
From: IMAGING.CLUB@OFFICE.WANG.COM ("Imaging Club")
Subject: More technical info on art museum imaging
Organization: Mail to News Gateway at Wang Labs
Date: 15 Sep 92 18:33:31 EST

There has been quite a lot of news group interest in that recent
Economist story on art museum imaging, primarily at the US' National
Gallery of Art.  I have now forwarded copies of the article to everyone
who requested one.  (This has nothing to do with Wang LAN or RS/6000
imaging solutions, although we are familiar with the technology.  Wang
"focuses" on document imaging solutions instead.)

There is a more technical article on this art museum imaging solution
in the August 17 issue of Federal Computer Week.  If you would like a
copy of this article, which is also quite interesting, let me know.

----------------------Michael.Willett@OFFICE.Wang.com---------------
Newsgroups: sci.image.processing
From: mlelstv@specklec.mpifr-bonn.mpg.de (Michael van Elst)
Subject: Re: Favorite FFTs (was 'Re: 2d dft phase info')
Organization: Max-Planck-Institut f"ur Radioastronomie
Date: Wed, 9 Sep 1992 18:43:00 GMT

In <1992Sep9.083621.7140@mcclb0.med.nyu.edu> smith@mcclb0.med.nyu.edu writes:
>> 512x512 float -> 256x512 complex in 4.3 sec on a DECStation 5000/200,
>Its good... (less than 3 secs for 512x512 reals on a DECstation 5000/240)

Seems that both routines keep the FP pipeline busy and use about the same
number of operations (the 5000/240 runs at 40MHZ, the 5000/200 runs at 25MHZ).

Regards,
-- 
Michael van Elst
UUCP:     universe!local-cluster!milky-way!sol!earth!uunet!unido!mpirbn!p554mve
Internet: p554mve@mpirbn.mpifr-bonn.mpg.de
                                "A potential Snark may lurk in every tree."
From: banks@csuvax1.csu.murdoch.edu.au (Corey Banks)
Subject: Finger Prints
Followup-To: sci.image.processing
Keywords: WANTED
Reply-To: banks@murdoch.edu.au
Organization: Murdoch University
Date:  9 Sep 92 08:07:19 GMT

Hi There,

	I'm an honours student, and I'm looking for some finger print images to
process in my honours project.  I've come to the conclusion that the hardest
part (well most time consuming anyway) will probably be in getting the images, 
rather than the processing I want to do on them.  So I thought I might post here
and ask If anyone has (a) a bunch of images they want to send me, or (b) a ftp
site I could get some images.  The second option would be great if it is at all
possible.  I wont attached ID's to the prints as I don't want to know who they 
belong to,  I just want to compare them.

	If you've got a large collection that you would like to send to me (I 
only need around 500) then email me and we can work something out.

Thanks in advance
Corey Banks.

--
    _-_|\     Corey Banks.           Things were going pretty well      
   /     \                           `till I died. - Shakesphere Sister 
   *_.-._/    banks@murdoch.edu.au  ----------------------------------- 
        v     corey@home.bed.zzz     PASS - People Against Smart Sigs   
Newsgroups: sci.image.processing
From: ericj@hwcae.Honeywell.COM (Eric Jacobsen)
Subject: Re: 2d dft phase info
Organization: Honeywell, Air Transport Division; Phoenix, AZ
	<1992Sep7.110102.25536@bnr.co.uk>
	<1992Sep8.133449.26552@zia.aoc.nrao.edu>
Date: Tue, 8 Sep 1992 19:45:51 GMT

In article <1992Sep8.133449.26552@zia.aoc.nrao.edu> dbriggs@zia.aoc.nrao.edu (Daniel Briggs) writes:

   direction just isn't that much added complexity.  Finally, is or isn't the
   FHT kosher to use these days?  When first it came out, Stanford was trying
   to milk it for all it was worth.  I actually sent for one of their information
   packets.  They wanted something like 5% of gross sales per copy or some hefty
   minimum, for any program which used the transform.  That all by itself was
   a good reason not to use the transform at the time, when it doesn't really
   provide much more in the way of functionality than the FFT.

GOOD QUESTION! I've been trying to find this out for a while, too. I'm not
sure if Stanford can lay claim to much other than the original algorithm
implementations that Bracewell published, and there have been other
equivalent implementations published (IEEE ASSP had one a few years back, I
can get the specifics if need be). BTW, there is a serious bug in the
BASIC FHT code Bracewell published in his book, anyway, so I always wondered
how that would affect any claims they tried to make on copyrights.

Has anybody got the lowdown on this stuff? It seems a shame for everybody
doing audio and other real-valued stuff to have to deal with ffts when
there are some advantages to fhts. I've got a lot of stuff I could
publish or even release pd if I knew for sure that Stanford wasn't going
to come after my butt later on...
--
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
* Eric Jacobsen        Honeywell Inc.                           *
|     1-602-436-3941   Commercial Flight Systems, Air Transport |
* HVN       436-3941   US Mail: P.O. Box 21111, MS 2Q34C1       *
| FAX 1-602-436-1310   Phoenix AZ 85036-1111                    |
* INet: ericj@hwcae.honeywell.com                               *
| UUCP: uunet!hwcae.honeywell.com!ericj@uunet.uu.net            |
* The opinions expressed are my own and therefore better        *
| thought out than my employer's.                               |
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

Newsgroups: sci.image.processing
From: jet5r@kelvin.seas.Virginia.EDU (Jose Eduardo Tabora)
Subject: Need help digitizing images
Organization: University of Virginia
Date: Mon, 7 Sep 1992 19:08:48 GMT

Our research group is trying to buy equipment to digitize from
recorded images (full motion video).  We need help in the
following:

1 - Recomendation on frame grabers.

2 - Recomendations on hardware, Is it prefered to have an
optical disk for storage?, Why?.

3 - What is the normal set up to digitize images from recorded
VCR?

We plan to invest about 30K $ in this equiopment and we want
to make sure it is wrthy.

Thanks in advance.

Jose Tabora

jet5r@virginia.edu
Newsgroups: sci.image.processing
From: gst5@igpho (Li)
Subject: wavelet on image processing
Reply-To: gst5@p.igp.ethz.ch
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
X-Newsreader: Tin 1.1 PL3
Date: Mon, 7 Sep 1992 15:11:17 GMT

Hello, all,

I'm looking for information on the applications of wavelet transform to image
processing. What I'm interested is the extraction of edge, valley and ridge
in a digital image. Could anybody working this area tell me where can find
more information on it? Any help will be appreciated.

Thanks in advance.

Best regards!

--
NAME Haihong Li
EMAIL gst5@p.igp.ethz.ch
SMAIL IGP, ETH-Hoeggerberg, CH-8093, Zuerich, Switzerland
PHONE 0041-01-377 3058 (work)   0041-01-366 2450 (home)
From: dhe@ncratl.AtlantaGA.NCR.COM (Duanfeng He)
Newsgroups: sci.image.processing
Subject: Re: ccd camera
Date: 10 Sep 92 13:02:54 GMT
Organization: NCR Engineering and Manufacturing Atlanta -- Atlanta, GA

<1992Sep7.150506.6704@mpifr-bonn.mpg.de>

In <1992Sep7.150506.6704@mpifr-bonn.mpg.de> mlelstv@specklec.mpifr-bonn.mpg.de
(Michael van Elst) writes:

>In <jecome01.715798061@starbase.spd.louisville.edu>
jecome01@rigel.spd.louisville.edu (Eric Comer) writes:
>>      if the lens caps is place on a ccd camera and an image is capture,
>>      why aren't all of the pixel values 0 (black)?  when the image is
>>      normalized it seems like there are faint light diagonal lines
>>      throughtout the whole image.  the image acquired was a gray scale
>>      image the min value was 0 and the max value was 6.  any ideas?

>Well, two things. The CCD doesn't need to give you a value of 0 without
>light. This depends on the offset and gain of the video amplifier. Second,
>your system obviously catches some periodic stray signal. If you know
>your pixel rate then you can translate the number of pixels into the
>offending frequency in the time domain. Most likely this will be a 60Hz
>noise signal.

I tend to agree with Michael, although I'm from the optical side.  So 
count me in as one more vote for the electrical noise, rather than 
optical.

Well, what I meant by optical noise is really the dark current non-
uniformity everybody else mentioned.  What I meant by electrical noise
is the stray signal (such as 60Hz) as quoted above.

The key here is that the levels of signal is rather uniform here, and
form diagonal lines.  For a non-uniformity, usually the first thing you
see is the blemishes, which are like holes in a satuation picture, and
not much in a dark picture.  The second thing you might see, again for
non-uniformity, is the chip granding turns.  These again probably shows
up in lighted pictures better.

Most CCD cameras are not auto-gain-controlled, I believe.  Dark current
noise level (non-uniformity noise) should have been set at a rather low
level, probably 0-3 levels, I would guess.

Am I venturing too far on my guesses?


-- 
Duanfeng He (Jackson)           Duanfeng.He@AtlantaGa.NCR.com
From: spl@szechuan.uucp (Steve Lamont)
Newsgroups: sci.image.processing
Subject: Re: ccd camera
Date: 6 Sep 1992 22:50:33 GMT
Organization: University of Calif., San Diego/Microscopy and Imaging Resource
NNTP-Posting-Host: szechuan.ucsd.edu

In article <jecome01.715798061@starbase.spd.louisville.edu> jecome01@rigel.spd.louisville.edu (Eric Comer) writes:
>	if the lens caps is place on a ccd camera and an image is capture,
>	why aren't all of the pixel values 0 (black)?  when the image is
>	normalized it seems like there are faint light diagonal lines
>	throughtout the whole image.  the image acquired was a gray scale
>	image the min value was 0 and the max value was 6.  any ideas?

Noise, mostly.  There may also be imperfections in the CCD -- a
perfect chip, in fact, is fairly rare (and expensive), particularly at
higher resolutions.  Finally, there is a charge accumulation (dark
current) that occurs even when the shutter is closed or the lense cap
is on.

Excerpting from the Photometrics Series 200 manual, "[all] electronic
circuitry generates noise.  Photon shot noise, dark current, and read
noise are primary CCD camera noise sources.

"Photon shot noise is a funamental property of the quantum nature of
light...

"Dark current, or thermally generated charge, cannot be distinguished
from photon induced charge.  Dark current can be measured and
subtracted, but its noise component cannot be ignored...

"The third primary source of noise, read noise, sets the detection
limits of a CCD camera.  Read noise is generated by the on chip output
ampilfier...

"Three types of integration measure the charge that has integrated on
the CCD:  exposure, bias, and dark integrations. ..."

There's a whole lot more to this, obviously, but that should at least
give you some ideas on what's going on.

The bottom line to all of this is that you have to be certain to
remove the effects of the bias, dark current, and, possibly, light
source non-linearities and artifacts when you grab an image.

							spl

-- 
Steve Lamont, SciViGuy -- (619) 534-7968 -- spl@dim.ucsd.edu
UCSD Microscopy and Imaging Resource/UCSD Med School/La Jolla, CA 92093-0608
"There was a time when tyrants feared/The new world of the free.
Now freedom is afraid and shrieks/At tyranny." - "Brave New World," A. Macleish
Newsgroups: sci.image.processing
From: cflatter@nrao.edu (Chris Flatters)
Subject: Re: image reconstruction in medicine
Reply-To: cflatter@nrao.edu
Organization: NRAO
Date: Tue, 8 Sep 1992 21:12:18 GMT

In article @lynx.unm.edu, mulberry@triton.unm.edu () writes:
>Can anybody suggest good literature on the applications
>of image reconstruction in medical imageing (CAT, PET, etc.)?

There was a review article in the December 1991 issue of Computing Surveys:

	Three Dimensional Medical Imaging: Algorithms and Computer Systems
	M. R. Stytz, G. Frieder and O. Frieder
	ACM Computing Surveys vol 23 p421 (1991)

I imaging this would be a good place to start.

	Chris Flatters
	cflatter@nrao.edu
Newsgroups: sci.image.processing
From: dostie@ccrs.emr.ca (M Dostie)
Subject: *** WANTED PD IMAGE PROCESSING PROGRAMS ***
Organization: Canada Centre for Remote Sensing, Ottawa
Date: Mon, 14 Sep 1992 12:44:52 GMT


We are interested in ftp'ing any PD versions of software which is available
for image processing. If you know of any such packages please send me
a quick note with the name and location of the package and perhaps a 
quick description of its abilities.

Your help is greatly appreciated.

	Mark Dostie
	dostie@mda.ca
-- 
---------------------------------------------	
		Mark Dostie
		Systems Support and Integration
		MDA / CCRS contract
From: mark@sunrise.sli.unimelb.edu.au (Mark Shortis)
Newsgroups: sci.image.processing
Subject: Re: ccd camera
Summary: Flat fielding problem
Keywords: CCD cameras, radiometric calibration, flat field
Date: 8 Sep 92 10:38:59 GMT
Reply-To: mark@sunrise.UUCP (Mark Shortis)
Organization: University of Melbourne, Dpt of Surveying and Land Information

Would anyone like to comment on the problem of calibrating the
radiometry of individual pixels in a CCD array?  

Essentially the problem is that for applications which require accurate 
radiometry (ie accurate grey levels are needed) the response of each pixel 
becomes important.

This is the classic issue of "flat fielding".  That is, if you supply a
perfectly uniform input, the response of every pixel can be calibrated.
Do this at two light levels and an offset and gain for each pixel can be
computed.

How do you create such a flat field?  Perfectly uniform light sources
don't grow on trees!

If I get any individual replies I will post a summary.

Mark.


____________________________________________________________________
Dr. Mark R. Shortis,                 Mark_Shortis@mac.unimelb.edu.au
Senior Lecturer,
Dept. of Surveying and Land Information,
University of Melbourne,                     Telephone +613 344 6401
Parkville 3052, AUSTRALIA.                   Facsimile +613 347 2916

"Any sufficiently advanced technology will be indistinguishable from
 magic" : Robert A. Heinlein
____________________________________________________________________

Newsgroups: sci.image.processing
From: bozo@world.std.com (Stephen P Blackstock)
Subject: Re: ccd camera
Keywords: CCD cameras, radiometric calibration, flat field
Organization: The World Public Access UNIX, Brookline, MA
Date: Tue, 8 Sep 1992 14:28:11 GMT

In article <3093@ariel.its.unimelb.EDU.AU> mark@sunrise.UUCP (Mark Shortis) writes:
>Would anyone like to comment on the problem of calibrating the
>radiometry of individual pixels in a CCD array?  
>
>Essentially the problem is that for applications which require accurate 
>radiometry (ie accurate grey levels are needed) the response of each pixel 
>becomes important.
>
>This is the classic issue of "flat fielding".  That is, if you supply a
>perfectly uniform input, the response of every pixel can be calibrated.
>Do this at two light levels and an offset and gain for each pixel can be
>computed.
>
>How do you create such a flat field?  Perfectly uniform light sources
>don't grow on trees!
>

The way I do it is to put a light diffuser (a piece of white transluscent 
glass or plastic) *between the lens and the ccd*.  Then, point the lens at
a fairly uniformly-lit wall, and put it way out of focus.  If you can't put
the diffuser after the lens, put it right before the lens, and make sure to
focus far from the diffuser.  (The problem with doing it this way is that 
the lens will introduce some non-uniformity, though this should be at very
low spatial frequency, which may be acceptable to you.)

Another way to go is to remove the lens completely, but you can only do this
if the lens and shutter are separable.

-Stephen Blackstock
 Leaf Systems, Inc.
From: samir@mentor.cc.purdue.edu (Samir Patel)
Newsgroups: sci.image.processing
Subject: Want info for image formats like TIFF/GIFF etc....
Date: 12 Sep 92 00:34:04 GMT
Distribution: na
Organization: Purdue University Computing Center


 I want to read about various image formats like TIFF/GIFF etc...
 Where can I get them?
 Please Email to samir@mentor.cc.purdue.edu or 
		 samir@ed.ecn.purdue.edu

		 or Post it on the netnews sci.image.processing.

 Thanks,

 -samir
Newsgroups: sci.image.processing
From: susanm@an.hp.com (Susan Margulies)
Subject: Re: image reconstruction in medicine
Reply-To: susanm@hp-and.an.hp.com
Organization: Hewlett-Packard, Santa Clara Division
X-Newsreader: Tin 1.1.3 PL5
Date: Wed, 9 Sep 1992 20:11:26 GMT

: In article @lynx.unm.edu, mulberry@triton.unm.edu () writes:
: >Can anybody suggest good literature on the applications
: >of image reconstruction in medical imageing (CAT, PET, etc.)?
:

Nakagawa, Yoshitake, Shiohara, Gotoh, and Yoshida,
"A Compression and Reconstruction System for Medical Images,"
Systems and Computers in Japan, Vol. 22, No. 10, 1991. 

"Reversible Intraframe Compression of Medical Images"
IEEE TRansactions on Medical Imaging, Vol 7, No 4, Dec 88.

"Reversible Interframe Compression of Medical Images: A Comparison of
Decorrelation Methods," IEEE Transactions on Medical Imaging, Vol 10,
No 4, Dec 91.

Susan
HP ISY
susanm@hp-and.an.hp.com
508-681-2153

Newsgroups: sci.image.processing
From: mvivino@helix.nih.gov (Mark A Vivino)
Subject: Re: Infrared Camera
Organization: National Institutes of Health
Distribution: usa
Date: Fri, 11 Sep 1992 19:06:54 GMT

In article <1992Sep10.191817.18053@noose.ecn.purdue.edu>, helz@ecn.purdue.edu (Randall A Helzerman) writes:
> 
> I would like to do some signal processing of infrared images 
> of the human body.  However, I'm having a very hard time finding a
> supplier of inexpensive ($1,000 or so) cameras.
> 
> Does anyone "out there" know where I can buy one with NTSC output
> somewhere around my target price?

ElectroPhysics 201-667-2262 has several inexpensive IR NTSC cameras
Newsgroups: sci.image.processing
From: jssloka@ritchie.uwaterloo.ca (Jeffery Scott Sloka)
Subject: Is there a FAQ for this group yet?
Keywords: FAQ
Organization: University of Waterloo
Date: Mon, 14 Sep 1992 15:30:16 GMT

I'd love to know if there is a FAQ that is being compiled for this group.  I realize that it is new but I was just hoping.  I may be able to contribute a little bit to it...

		-Scott

Newsgroups: sci.image.processing
From: jecome01@rigel.spd.louisville.edu (Eric Comer)
Subject: ccd camera
Date: Sun, 6 Sep 1992 16:47:41 GMT
Organization: University of Louisville

	if the lens caps is place on a ccd camera and an image is capture,
	why aren't all of the pixel values 0 (black)?  when the image is
	normalized it seems like there are faint light diagonal lines
	throughtout the whole image.  the image acquired was a gray scale
	image the min value was 0 and the max value was 6.  any ideas?

Newsgroups: sci.image.processing,comp.graphics,rec.arts.fine
From: efstse@epsilon.eecs.nwu.edu (Serafim Efstratiadis)
Subject: Re: Economist article on art museum imaging
Organization: EECS Department, Northwestern University
Date: Sun, 13 Sep 1992 13:24:12 GMT

In article <199209100253.AA15416@tuna.wang.com> IMAGING.CLUB@OFFICE.WANG.COM ("Imaging Club") writes:
>I have now sent copies of that new Economist article on art museum
>imaging to everyone who requested one.  Sorry for the delay.  I was on
>vacation and, in addition, our Internet/Usenet connection was down
>for a while.  If anyone was not able to get through to me, I'll be
>happy to send him a copy too!
>
>Michael.Willett@OFFICE.Wang.com


Xref: sparky sci.image.processing:695 comp.compression:3274 comp.compression.research:167 alt.comp.compression:36