From karol at mpi-inf.mpg.de Wed Jan 2 04:34:44 2008 From: karol at mpi-inf.mpg.de (Karol Myszkowski) Date: Wed Jan 2 04:35:11 2008 Subject: [HDRI] Re: CFP for APGV'08: FIFTH SYMPOSIUM ON APPLIED PERCEPTION IN GRAPHICS AND VISUALIZATION In-Reply-To: <477B80F1.6090008@mpi-inf.mpg.de> References: <477B7CC6.8060807@mpi-inf.mpg.de> <477B80F1.6090008@mpi-inf.mpg.de> Message-ID: <477B84E4.4070802@mpi-inf.mpg.de> Hi, Enclosed please find a call-for-papers for APGV'08: FIFTH SYMPOSIUM ON APPLIED PERCEPTION IN GRAPHICS AND VISUALIZATION APGV'08 would be very interested in submissions from the HDRI field with some perception component. Best wishes, Karol Myszkowski ---------------------------------------------- APGV'08: FIFTH SYMPOSIUM ON APPLIED PERCEPTION IN GRAPHICS AND VISUALIZATION Co-located with ACM Siggraph in Los Angeles, USA 9th - 10th August, 2008 http://www.apgv.org FIRST CALL FOR PARTICIPATION ---------------------------- Research in computer graphics and visualization has great potential to benefit from, and contribute to, research in perception. Since 2004, this symposium has brought together researchers from the fields of perception, graphics, and visualization, to facilitate a wider exchange of ideas. Submissions are invited in the broad range of areas at the intersection of computer graphics, visualization, and perception to fulfill two goals of this multidisciplinary community. Goal 1. Use insights from perception to advance the design of methods for visual, auditory and haptic representation. Specific examples include, but are not limited to: * applications of insights from perception to the development of algorithms for more efficient, effective or realistic modeling, rendering and/or animation * applications of perception in the design and evaluation of methods for more effective representation and communication of data * computational aesthetics, stylization and perceptual aspects of non-photorealistic rendering * perceptual issues arising due to fusion of digital imaging, computer vision, and computer graphics techniques * perception-inspired interfaces for immersive activities in virtual worlds Goal 2. Advance and facilitate novel basic perception and cognition research that uses and is relevant to applications in computer graphics and visualization. Here specific examples include, but are not limited to: * perception and visuomotor control in computer games, virtual and augmented environments * fundamental contributions in spatial and temporal vision * integration of empirical perception research with computational models * color vision and color appearance modeling * the influence of attention and eye movements on visual perception and visual memory * statistical learning and perception of natural scenes * perception of shapes, surfaces and materials * visual illusions and perceptual organization having potential to enhance image depiction Proceedings, which will include the poster abstracts, will be published by ACM SIGGRAPH. Best papers from the symposium will be invited to be extended for a special issue of the ACM Transactions on Applied Perception. http://www.acm.org/tap/ By collocating APGV 08 with the thirty-fifth annual SIGGRAPH Conference (SIGGRAPH 08), we aim to further promote communication between the core perception and the core computer graphics communities, and also bring APGV back to the United States. CONFERENCE CHAIRS ----------------- Bobby Bodenheimer, Vanderbilt University Betty Mohler, Max Planck Institute for Biological Cybernetics PROGRAM CHAIRS -------------- Sarah Creem-Regehr, University of Utah Karol Myszkowski, MPI Informatik IMPORTANT DATES --------------- Paper Submission: Monday, April 7, 2008 Poster Submission: Monday, May 12, 2008 Symposium: Saturday, August 9, 2008 ? Sunday, August 10, 2008 From magali.bodart at uclouvain.be Wed Jan 23 00:34:58 2008 From: magali.bodart at uclouvain.be (Bodart Magali) Date: Wed Jan 23 00:37:59 2008 Subject: [HDRI] camera + fisheye Message-ID: <7.0.1.0.2.20080123092227.0266d0a8@uclouvain.be> Dear HDR users I am considering to buy a camera + fisheye in order to make luminance measurements (mostly daylight scenes) and calculation of glare indexes. The camera seller said me that the only solution to have a full 180? view is the combination of the sigma f3.5 fisheye + a full format numeric camera (called 24/36 like with analogic cameras) and the cheapest one is the CANON EOS 5D (around 2500 euros). I know that some of did some daylight measurement with cheapest camera. Who can help me with that topic ? Thanks a lot Magali *********************************************************************************************************************************** Magali Bodart Postdoctoral Researcher Universit? Catholique de Louvain Belgium From chumann at broadviewnet.net Wed Jan 23 13:56:40 2008 From: chumann at broadviewnet.net (Christian Humann) Date: Wed Jan 23 13:03:12 2008 Subject: [HDRI] Fisheye Lense + IBL with HDR image question. Message-ID: <4797B818.3000006@broadviewnet.net> Hi Magali, Sigma just released a 4.5 mm 180 degree fisheye for APS-C size (the smaller sensors) digital SLR cameras. http://www.sigmaphoto.com/news/news.asp?nID=3377 I just received one yesterday from B+H photo in New York and so far it seems to deliver as promised. I'm using it with a Nikon D50. Question (sorry if this is back to basics but despite many archive searches I'm still at a loss): When viewing an HDR image with "ximage" and taking spot measurements with the "L" command I get reasonably accurate luminance values. When I map the HDR image as an emissive glow on to a "source" geometry and view the scene with "rvu" I get much lower luminance values than at the same spots measured in ximage. Below is the scene description: ######## void colorpict skypict 11 red green blue sky.hdr fisheye.cal fish_u fish_v -rz 180 -rx -90 0 0 skypict glow skyglow 0 0 4 1 1 1 0 skyglow source sky 0 0 4 0 0 1 180 ######### My end goal is to document various sky conditions to be used for IBL scenes. Happy New Year and thanks in advance. Chris -------------- next part -------------- A non-text attachment was scrubbed... Name: chumann.vcf Type: text/x-vcard Size: 315 bytes Desc: not available Url : http://radiance-online.org/pipermail/hdri/attachments/20080123/dc23e217/chumann.vcf From kunkel at cs.bris.ac.uk Wed Jan 23 13:15:37 2008 From: kunkel at cs.bris.ac.uk (Timo Kunkel) Date: Wed Jan 23 13:12:13 2008 Subject: [HDRI] RE: camera + fisheye Message-ID: <200801232112.m0NLCBpR007033@mta2.lbl.gov> Hi Magali! The SIGMA 8mm fisheye will work on a more reasonably priced camera with a cropped sensor (usually about factor 1.6 or 1.3), but you won't capture the full circle of 180deg. However, I read a while ago that SIGMA is planning to release a full 180deg fisheye for cropped sensors (like those used in the entry and semi-pro SLR lines). Here are the links: http://www.sigmaphoto.com/lenses/lenses_all_details.asp?id=3336&navigator=6 http://www.sigmaphoto.com/lenses/lenses_all_details.asp?id=3337&navigator=6 These can then be combined with the more affordable Canon or Nikon SLR bodies. A benefit of a 36x24 sensor (full frame) might be the better low light sensitivity due to larger photosites (pixels). It might be therefore worth to give the camera systems of choice a try if possible if they fit your need. Cheers, Timo ---------------- Timo Kunkel University of Bristol UK > -----Original Message----- > From: hdri-bounces@radiance-online.org [mailto:hdri-bounces@radiance- > online.org] On Behalf Of hdri-request@radiance-online.org > Sent: None > To: hdri@radiance-online.org > Subject: HDRI Digest, Vol 18, Issue 2 > > Send HDRI mailing list submissions to > hdri@radiance-online.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://www.radiance-online.org/mailman/listinfo/hdri > or, via email, send a message with subject or body 'help' to > hdri-request@radiance-online.org > > You can reach the person managing the list at > hdri-owner@radiance-online.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of HDRI digest..." > > > Today's Topics: > > 1. camera + fisheye (Bodart Magali) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 23 Jan 2008 09:34:58 +0100 > From: Bodart Magali > Subject: [HDRI] camera + fisheye > To: hdri@radiance-online.org > Message-ID: <7.0.1.0.2.20080123092227.0266d0a8@uclouvain.be> > Content-Type: text/plain; charset="iso-8859-1"; format=flowed > > Dear HDR users > > I am considering to buy a camera + fisheye in > order to make luminance measurements (mostly > daylight scenes) and calculation of glare indexes. > The camera seller said me that the only solution > to have a full 1800 view is the combination of > the sigma f3.5 fisheye + a full format numeric > camera (called 24/36 like with analogic cameras) > and the cheapest one is the CANON EOS 5D (around 2500 euros). > I know that some of did some daylight measurement > with cheapest camera. Who can help me with that topic ? > > Thanks a lot > > Magali > > ************************************************************************** > ********************************************************* > Magali Bodart > > Postdoctoral Researcher > Universiti Catholique de Louvain > Belgium > > > > > > ------------------------------ > > _______________________________________________ > HDRI mailing list > HDRI@radiance-online.org > http://www.radiance-online.org/mailman/listinfo/hdri > > > End of HDRI Digest, Vol 18, Issue 2 > *********************************** From chris at christianhumann.com Wed Jan 23 14:18:27 2008 From: chris at christianhumann.com (chris@christianhumann.com) Date: Wed Jan 23 13:21:07 2008 Subject: [HDRI] Fisheye Lense + IBL with HDR image question. Message-ID: <4797BD33.50206@christianhumann.com> Hi Magali, Sigma just released a 4.5 mm 180 degree fisheye for APS-C size (the smaller sensors) digital SLR cameras. http://www.sigmaphoto.com/news/news.asp?nID=3377 I just received one yesterday from B+H photo in New York and so far it seems to deliver as promised. I'm using it with a Nikon D50. Question (sorry if this is back to basics but despite many archive searches I'm still at a loss): When viewing an HDR image with "ximage" and taking spot measurements with the "L" command I get reasonably accurate luminance values. When I map the HDR image as an emissive glow on to a "source" geometry and view the scene with "rvu" I get much lower luminance values than at the same spots measured in ximage. Below is the scene description: ######## void colorpict skypict 11 red green blue sky.hdr fisheye.cal fish_u fish_v -rz 180 -rx -90 0 0 skypict glow skyglow 0 0 4 1 1 1 0 skyglow source sky 0 0 4 0 0 1 180 ######### My end goal is to document various sky conditions to be used for IBL scenes. Happy New Year and thanks in advance. Chris From jacobs.axel at gmail.com Thu Jan 24 01:29:33 2008 From: jacobs.axel at gmail.com (Axel Jacobs) Date: Thu Jan 24 01:29:41 2008 Subject: [HDRI] camera + fisheye Message-ID: <100441490801240129i5f6c4e48v277d4d7862db10ee@mail.gmail.com> > I am considering to buy a camera + fisheye in > order to make luminance measurements (mostly > daylight scenes) and calculation of glare indexes. > The camera seller said me that the only solution > to have a full 180? view is the combination of > the sigma f3.5 fisheye + a full format numeric > camera (called 24/36 like with analogic cameras) > and the cheapest one is the CANON EOS 5D (around 2500 euros). > I know that some of did some daylight measurement > with cheapest camera. Who can help me with that topic ? If a 3 MP camera will do, and you're not afraid of using a system that isn't exactly cutting-edge, then you may use a Nikon CoolPix 990 or 995, in combination with a Nikon FC-E8 fisheye lens. You'll get the cam + lens for around ?/$/? 200 on e-bay. I've used both systems in the past, and would happily point out the pros/cons of CP990 vs CP995. They actually differ quite a bit. Let me know if you would consider this option. Axel From Santiago.Torres at arup.com Thu Jan 24 03:38:15 2008 From: Santiago.Torres at arup.com (Santiago Torres) Date: Thu Jan 24 03:38:38 2008 Subject: [HDRI] camera + fisheye Message-ID: <13DD387AFBC5154096CF3097A6D7163105DB15B7@ldcexc01.global.arup.com> Hi Magali, I agree with Axel's comment. There are also some new(er) cameras that can use the FC-E8 or FC-E9(an improved version) Check http://nikonimaging.com/global/products/accessory/converter/list.htm I've used the Coolpix 5000, and they work very well in my experience. However, be aware that with the latest model (Nikon Coolpix P5100) which I believe can take the fish-eye with an adaptor, you cannot use bracketing in manual mode which can be problematic, but that depends on the application. Good luck with your measurements, and please keep us posted. Regards, Santiago -----Original Message----- From: hdri-bounces@radiance-online.org [mailto:hdri-bounces@radiance-online.org] On Behalf Of Axel Jacobs Sent: 24 January 2008 09:30 To: hdri@radiance-online.org Subject: [HDRI] camera + fisheye > I am considering to buy a camera + fisheye in order to make luminance > measurements (mostly daylight scenes) and calculation of glare > indexes. > The camera seller said me that the only solution to have a full 180? > view is the combination of the sigma f3.5 fisheye + a full format > numeric camera (called 24/36 like with analogic cameras) and the > cheapest one is the CANON EOS 5D (around 2500 euros). > I know that some of did some daylight measurement with cheapest > camera. Who can help me with that topic ? If a 3 MP camera will do, and you're not afraid of using a system that isn't exactly cutting-edge, then you may use a Nikon CoolPix 990 or 995, in combination with a Nikon FC-E8 fisheye lens. You'll get the cam + lens for around ?/$/? 200 on e-bay. I've used both systems in the past, and would happily point out the pros/cons of CP990 vs CP995. They actually differ quite a bit. Let me know if you would consider this option. Axel _______________________________________________ HDRI mailing list HDRI@radiance-online.org http://www.radiance-online.org/mailman/listinfo/hdri ____________________________________________________________ Electronic mail messages entering and leaving Arup business systems are scanned for acceptability of content and viruses From gregoryjward at gmail.com Thu Jan 24 13:42:22 2008 From: gregoryjward at gmail.com (Gregory J. Ward) Date: Thu Jan 24 13:42:33 2008 Subject: [HDRI] Fisheye Lense + IBL with HDR image question. In-Reply-To: <4797BD33.50206@christianhumann.com> References: <4797BD33.50206@christianhumann.com> Message-ID: <87EE8081-CF9E-4B54-B396-17AFC0187A4F@gmail.com> Hi Chris, This is more of a Radiance question, I suppose, but the problem is that you have an EXPOSURE= value in your header that ximage is smart about, but the renderer ignores. To get absolute values out of rvu, either set a factor in your glow to 1/EXPOSURE (in all three channels) or "undo" the exposure by passing your picture through pfilt with -e set to the reciprocal of the exposure getinfo tells you. Cheers, -Greg P.S. Having the renderers ignore the EXPOSURE line was a design decision to facilitate texture normalization under the more typical circumstance when it is being used to modify reflectance. > From: "chris@christianhumann.com" > Date: January 23, 2008 2:18:27 PM PST > Question (sorry if this is back to basics but despite many archive > searches I'm still at a loss): > When viewing an HDR image with "ximage" and taking spot > measurements with the "L" command I get reasonably accurate > luminance values. When I map the HDR image as an emissive glow on > to a "source" geometry and view the scene with "rvu" I get much > lower luminance values than at the same spots measured in ximage. > Below is the scene description: > ######## > void colorpict skypict > 11 red green blue sky.hdr fisheye.cal fish_u fish_v -rz 180 -rx -90 > 0 > 0 > > skypict glow skyglow > 0 > 0 > 4 1 1 1 0 > > > skyglow source sky > 0 > 0 > 4 0 0 1 180 > ######### > > My end goal is to document various sky conditions to be used for > IBL scenes. > > Happy New Year and thanks in advance. > Chris