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Image aquisition tips: | |||
any camera can do BUT higher resolution = higher model detail | any camera can do BUT higher resolution = higher model detail<br /> | ||
always shoot raw - process if necessary - export tiff / jpeg | always shoot raw - process if necessary - export tiff / jpeg<br /> | ||
use fixed focal length / 24mm - 50mm recommended | use fixed focal length / 24mm - 50mm recommended<br /> | ||
if variable zoom then keep it always at minimum or maximum length and don’t change it while shooting | if variable zoom then keep it always at minimum or maximum length and don’t change it while shooting<br /> | ||
constant aperture f/5.6-8.0 (f/11 max) | constant aperture f/5.6-8.0 (f/11 max)<br /> | ||
keep whole object in focus | keep whole object in focus<br /> | ||
iso as low as possible 100-800 | iso as low as possible 100-800<br /> | ||
diffuse light - no hard shadows! | diffuse light - no hard shadows!<br /> | ||
camera orientation depending on subject - fill the frame | camera orientation depending on subject - fill the frame<br /> | ||
increments of 10-15 degrees between pics | increments of 10-15 degrees between pics<br /> | ||
overlap two thirds / 60% of last pic | overlap two thirds / 60% of last pic<br /> | ||
no over- or underexposed pics | no over- or underexposed pics<br /> | ||
use gray card / color checker if necessary | use gray card / color checker if necessary<br /> | ||
use printed measurement markers / tennis balls for big scenes / or when footage origin differs | use printed measurement markers / tennis balls for big scenes / or when footage origin differs<br /> | ||
use tripod when low light or turntable | use tripod when low light or turntable<br /> | ||
shoot from as many angles as possible, up to down and around | shoot from as many angles as possible, up to down and around<br /> | ||
always take more pics than necessary | always take more pics than necessary<br /> | ||
Calibrated Photogrammetric Scale Bars (as an example, regarding targets) | Calibrated Photogrammetric Scale Bars (as an example, regarding targets)<br /> | ||
http://culturalheritageimaging.org/What_We_Offer/Gear/Scale_Bars/index.html | http://culturalheritageimaging.org/What_We_Offer/Gear/Scale_Bars/index.html<br /> | ||
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Revision as of 07:22, 4 November 2022
Image aquisition tips:
any camera can do BUT higher resolution = higher model detail
always shoot raw - process if necessary - export tiff / jpeg
use fixed focal length / 24mm - 50mm recommended
if variable zoom then keep it always at minimum or maximum length and don’t change it while shooting
constant aperture f/5.6-8.0 (f/11 max)
keep whole object in focus
iso as low as possible 100-800
diffuse light - no hard shadows!
camera orientation depending on subject - fill the frame
increments of 10-15 degrees between pics
overlap two thirds / 60% of last pic
no over- or underexposed pics
use gray card / color checker if necessary
use printed measurement markers / tennis balls for big scenes / or when footage origin differs
use tripod when low light or turntable
shoot from as many angles as possible, up to down and around
always take more pics than necessary
Calibrated Photogrammetric Scale Bars (as an example, regarding targets)
http://culturalheritageimaging.org/What_We_Offer/Gear/Scale_Bars/index.html
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Origins of Photogrammetry
Albrecht Meydenbauer https://de.wikipedia.org/wiki/Albrecht_Meydenbauer
Aimé Laussedat https://en.wikipedia.org/wiki/Aim%C3%A9_Laussedat
Camera Lucida https://neolucida.com/history
Stereo photography http://camera-wiki.org/wiki/Stereo https://en.wikipedia.org/wiki/Stereoscope
Aerial photogrammetry https://www.researchgate.net/figure/Figure-12-Illustrate-the-geometry-of-aerial-photogrammetry-13_fig1_334164581 https://en.wikipedia.org/wiki/Stereoplotter