Greg, Thanks for the reply. My errors are in absolute terms. I have a Minolta luminance meter and a Macbeth grey card in the middle of the scene. I am also doing comparisons of absolute luminance values produced by the FireFly as compared to the luminance results from my Canon camera on images captured at the same time of the same scene. I have high confidence in my Canon results from previous validations. The HDR that Photosphere resolves for the Firefly at first look reasonable within the scene it has logical variation in luminance values. It is the absolute errors that I am worried about.
Thanks! Kevin Van Den Wymelenberg Integrated Design Lab Boise, Director College of Art & Architecture, Assistant Professor University of Idaho Boise Center www.uidaho.edu/idl ph. 208.724.9456 fx. 208.343.0001 306 S. 6th Street Boise, ID 83702 From: "Gregory J. Ward" <[email protected]> Reply-To: High Dynamic Range Imaging <[email protected]> Date: Fri, 17 Jun 2011 13:44:13 -0700 To: High Dynamic Range Imaging <[email protected]> Subject: Re: [HDRI] Accuracy issue from Firefly MV in Photosphere Hi Kevin, Are you errors in absolute terms or relative (e.g., one patch to another on a Macbeth chart or similar)? -Greg > > From: Kevin Van Den Wymelenberg <[email protected]> > > Date: June 17, 2011 1:19:17 PM PDT > > > All, > > I have been creating HDR images for purposes of pixel-based luminance analysis > from photographs captured with a PointGrey Firefly MV [FMVU-13S2C (Color)]. > > http://www.ptgrey.com/products/fireflymv/fireflymv_usb_firewire_cmos_camera.as > p > > It is a board level camera with usb 2 connection, uses the Sony IMX035LQR-C > cmos sensor and a rolling shutter. I have fixed exposure to 1, brightness to > 0, gain to 0, and turned the frame rate off. I have then run multiple > exposures (10-12) using shutter speeds from 1ms to 8000ms excluding completely > saturated exposures. I have a fisheye lens attached but have not been able > to run vignetting correction yet since I do not trust my response curve. I > have been running accuracy comparisons to my Canon which I trust with poor > comparisons. It is successfully resolving in Photosphere, but only after I > manually write the EXIF header since the camera actually does not write an > EXIF header. I have written camera make, model, f stop, and shutter into > header. > > Any ideas? > > I would be happy to ftp exposures etc if it would help. > > Thanks for any help! _______________________________________________ HDRI mailing list [email protected] http://www.radiance-online.org/mailman/listinfo/hdri
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