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Topic: Perspective correction

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	Perspective correction - Wikipedia, the free encyclopedia
		Perspective correction is a procedure for composing or editing photographs to better conform with the commonly accepted distortions in constructed perspective.
		Perspective projection distortion occurs in photographs when the film plane is not parallel to lines that are desired to be parallel in the photo.
		Professional cameras where perspective correction is important correct the perspective at exposure by raising the lens parallel to the film.
	en.wikipedia.org /wiki/Perspective_correction (386 words)

	Perspective - Wikipedia, the free encyclopedia
		Perspective (visual), is the way in which objects appear to the eye.
		Perspective (graphical), means to represent the effects of visual perspective in drawings.
		Perspective (cognitive), in cognition, is the choice of a context for opinions, beliefs and experiences.
	en.wikipedia.org /wiki/Perspective (138 words)

	Perspective correction lens - Wikipedia, the free encyclopedia
		In photography, a perspective correction lens (or PC lens for short, also called a tilt and shift lens, or commonly just shift lens in the UK) is used to correct the optical effect of perspective.
		PC lenses are usually made for 35 mm film cameras, as most large format cameras have built-in features to allow for perspective correction.
		The key then to eliminating perspective is to keep the plane of the film parallel to the building.
	en.wikipedia.org /wiki/Perspective_correction_lens (445 words)

	Digital Image Studio, Digital perspective correction
		The perspective distortion commonly known as "keystone" distortion (taken from the wedge-shaped keystone block found at the summit of arch-ways in older architecture) has to be considered and managed when photographing architectural or other subjects with obvious vertical elements in order to present a natural perspective to the viewer.
		Correction can be achieved by tilting the baseboard and lens assembly relative to each other so as to negate the perspective distortion on the print.
		Since the horizontal angle of view decreases after perspective correction the original image must be taken including a margin or alternately shot with a slightly wider lens than required for the envisaged final image.
	home.swiftdsl.com.au /~distudio/perspective (1151 words)

	Perspective correction - dcviews (Site not responding. Last check: 2007-10-14)
		Perspective in a picture is dependent on object to camera distance and focal length of the lens used.
		Since wide-angles open up perspective while telephotos compress perspective it is difficult to guess actual distances between subjects in an image.
		It is easy to correct this kind of distortion by simply moving back and using a longer focal length (50 to 100 mm) on your zoom lens.
	www.dcviews.com /tutors/views/tt55412.htm (243 words)

	Perspective correction: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-10-14)
		Perspective correction is a procedure for editing photographs to better conform with the laws of perspective[Follow this hyperlink for a summary of this subject].
		Perspective projection distortion is an error introduced in drawing when images are created by the use of "projectors"....
		Today professional cameras sometimes have lenses that can correct the perspective during filming by rotating relative to the exposure area of the film.
	www.absoluteastronomy.com /encyclopedia/p/pe/perspective_correction.htm (263 words)

	perspective - Hutchinson encyclopedia article about perspective
		In perspective the horizon line refers to the line where the sky and earth seem to meet; it is on this line that the vanishing point is located.
		The scientific principles of perspective were first laid down, using mathematics and close observation, during the Renaissance period.
		The rules of perspective were first applied to art by the 15th-century Italian painter Masaccio, who used slanted lines to make objects appear to extend back into space in his paintings; the technique was initially discovered by a contemporary, the architect Filippo Brunelleschi.
	encyclopedia.farlex.com /perspective (590 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		Figure 35 illustrates a differential perspective correction apparatus that has a first crossover network located between the emitters of the transistors of a differential pair and a second crossover network located between the collectors of the differential pair.
		In the audio correction system 120, the image correction module 122 corrects the listener-perceived vertical image of an apparent sound stage reproduced by the loudspeakers, the bass enhancement module 101 improves the listener-perceived bass response of the sound, and the image enhancement module 124 enhances the listener-perceived horizontal image of the apparent sound stage.
		In one embodiment, the corrections are provided in a desirable order such that prior corrections provided by the apparatus 120 enhance and contribute to the subsequent corrections provided by the apparatus 120.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/26422.010412&ELEMENT_SET=DECL (11930 words)

	Photoshop Filters: ImageAlign Pro for Perspective Correction review D'Lynn Waldron
		Traditionally, shift and skew were done optically either with a view camera, or with a perspective correction lens on a 35 mm camera, which allow the relationship between the lens and the film plane to be changed.
		Perspective correction widens the image in the direction the lines are converging so that they become parallel.
		Perspective correction can also overcome the effect of wide angle lenses which make the foreground disproportionately large and the effect of telephoto lenses which compress the foreground.
	www.dlynnwaldron.com /ImageAlignPro.html (535 words)

	Perspective correction - PanoTools
		However, perspective correction is an issue for panorama creation as well, if you shoot your images tilted up or down.
		There are some easy and straightforward techniques to achieve perspective correction depending on the direction the camera was tilted.
		It is not often necessary to correct for a panned camera since we are used to horizontal perspective distortion.
	www.panotools.info /mediawiki/index.php?title=Perspective_correction (1586 words)

	Perspective Correction (Site not responding. Last check: 2007-10-14)
		Perspective distortion causes parallel lines appear to converge at a long distance.
		One way to correct this effect optically is to use a Tilt and Shift lens.
		Visually align the tilted edges with the vertical and horizontal grid lines till you are satisfied with the correction.
	gfoto.tripod.com /photoshop/perspective/perspective.htm (258 words)

	Comput 503 Assignment 2 - by Stan Melax (Site not responding. Last check: 2007-10-14)
		The proper way to do texture mapping in 3D applications is to use perspective correction.
		I have extended this concept to this application by taking perspective correction into account when generating textures from the image.
		In another example of perspective correct texture generation we are able to properly extract (without warping) a brick wall from a box room image:
	www.melax.com /pictour/perspective.html (284 words)

	Large format photography Forum: Correction of perspective
		Herr Soloman states that perspective is determined only by the camera position, but in fact when the lens is raised and repositioned, only the film position is unmoved so that the lens does indeed project a different image onto it from a slightly changed perspective.
		Thus the common useage of this as "perspective control" is correct, both technically and linguisticly.
		We shouldn't go into useless theoretical debates about perspective - fact is that both the Canon and Nikon web sites write of "manipulating perspective" or "perspective control" when they talk about their Shift-Tilt lenses thus we can assume that somebody in the "beginner" section of this forum will mean - exactly that.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=003Ch7 (1940 words)

	Perspective Correction Tutorial - Lonestardigital.com
		Perspective distortion (also called keystone distortion) is a common problem.
		Sometimes perspective distortion is unavoidable because of shooting situations or locations, sometimes it's actually desirable for the dramatic visual effect.
		The Perspective* tool ties two opposite sides of the picture together and should only be used in situations where the perspective distortion is absolutely equal from side to side or from top to bottom (which is rare).
	www.lonestardigital.com /perspective_correction.htm (532 words)

	: Class TextureAttributes
		Perspective correction - the perspective correction mode used for color and texture coordinate interpolation.
		Sets perspective correction mode to be used for color and/or texture coordinate interpolation.
		indicates that perspective correction should be performed and that the highest quality method should be used.
	java.sun.com /products/java-media/3D/forDevelopers/J3D_1_2_API/j3dapi/javax/media/j3d/TextureAttributes.html (1458 words)

	Perspective Corrected Texture Mapping
		Perspective Corrected Texturing [From Tom Hammerslevs Graphics Coding Page Check it out at http://www.users.globalnet.co.uk/~tomh ] Perspective Corrected Texturing --------------------------------------------------------------------------- Introduction Perspective texturing is an almost essential addition to any 3D engine nowadays.
		This cuts down on the divides overall, but it can lead to problems: if your correction value is too high for your resolution, the texture will 'wiggle' - the sample rate is too low.
		If your correction value is too high, you'll see all sorts of weird bendy patterns at certain viewing angles.
	www.whisqu.se /per/docs/graphics16.htm (676 words)

	Canon Digital Photography Forums - Perspective correction
		In this photo of an observation tower, I used Adobe Photoshop 6.0 to "correct" the perspective distortion in the original caused by aiming the camera up.
		I was "focused" so much on correcting the tower perspective that I forgot all about the door (and the ground level building).
		15th of July 2004 (Thu) 01:38 AM Sometimes it is better to correct the perspective depending on the object of your photo and the shooting angle.
	photography-on-the.net /forum/printthread.php?t=37441 (398 words)

	6/01/00 Watchtower magazine critique
		Correction: Plato never taught that God is the Father, the Son, and the Holy Spirit.
		Correction: True Christians are kept from habitual sin by the Lord Jesus and the Holy Spirit.
		Correction: True Christians are saved by the recognition of the death of Jesus for their sins.
	www.truthandgrace.com /Wt060100.htm (7641 words)

	f-stop.com - What is Perspective Correction?
		Here's the problem perspective correction addresses: Buildings can be pretty tall and are usually not found in the middle of vast, open landscapes.
		A key element in eliminating perspective distortion is keeping the film plane parallel to the subject, thus greatly reducing the differences in distance that wide angle lenses exaggerate.
		With a PC (perspective correction) lens for 35mm cameras, or a large format view camera, this is exactly what you do.
	www.f-stop.com /p-c.htm (598 words)

	Digital Imaging Software Review: Andromeda's LensDoc Plug-in
		Perspective: Tilt your camera up to shoot some skyscraper and (unless you're lucky enough to have a view camera) the vertical lines in your images are condemned to converge.
		The second slider bar adjusts the actual shape of the correction curve, allowing you to concentrate the correction more on the edges of the image or closer to the center.
		Correcting a pincushion distortion works along the same lines, only you're bending the curve the opposite way.
	www.imaging-resource.com /SOFT/LDOC/LDOC.HTM (2095 words)

	Digital Darkroom Forum: Perspective correction in Photoshop vs. Tilt-Shift lens
		The problem with the perspective correction in Photoshop is that you are free to modify the proportions (height/width) without constrains, in non-realistic ways.
		The solution is to use a geometrically correct correction, which takes into account the focal length used to take you picture.
		The hard point being here that, in case you need both horizontal and vertical perspective correction, if you enter a wrong focal length, your picture will be skewed (and proportions won't be correct in any case).
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=006zZQ (970 words)

	Hugin tutorial — Perspective correction
		Photographs taken with normal lenses tend to be lighter in the middle than at the edges due to the changing angle of incidence of light on the sensor or film.
		Notice that there is significant vignetting where the centre of the image is brighter than the edges, this could have been corrected with a radial filter before remapping.
		This elevation of the Capitoline Museum was stitched from four photographs and perspective corrected at the same time.
	hugin.sourceforge.net /tutorials/perspective/en.shtml (1066 words)

	panoguide - Correcting image distortion, perspective and converging verticals
		Quite a few image stitching tools are capable of correcting linear distortion in images (whether concave or convex distortion, such as the barrel distortion in poor quality rectilinear lenses or in fisheye lenses).
		These are listed in the products section and the thing to look out for is the capability to correct linear distortion.
		Using the crop tool, drag a bounding area into the image, and now, because of the perspective option, you can drag each corner of the bounding area around.
	www.panoguide.com /howto/panoramas/distortion_correction.jsp (397 words)

	Perspective Correction (Site not responding. Last check: 2007-10-14)
		But sometimes you can't access the best angle (in a museum, for example) or simply there is a strong reflection from a window directly opposite the wall.
		Since this tool will stretch the new image into the original image size/ratio, it is recommended that after applying Perspective Correction, you resize the image to correct proportions and then optionally apply the unsharp mask.
		Perspective Correction is also necessary tool for 3D game developers.
	www.mediachance.com /pbrush/help/perspectc.html (511 words)

	Digital Darkroom Forum: Digital perspective correction
		Correcting the angles seems to modify the hight/width relation of the building.
		As ever, perspective "correction" is itself a distortion, which can change the appearance of objects in other planes in an unpleasant way.
		It is not generally possible to correct the stretching effects without introducing other forms of distortion, e.g.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=00AGUu (896 words)

	Perspective Pilot - perspective correction software
		Perspective distortions often appear in the architectural building photography and urban landscape photography.
		Perspective Pilot is specially designed software for perspective correction of a photo:
		Click here to see more examples of photo correction in Perspective Pilot.
	www.colorpilot.com /perspective.html (160 words)

	Perspective Filter (Site not responding. Last check: 2007-10-14)
		Introduce consistent perspective in string of text characters.
		You can also upload your own image, try Perspective on it, and download the result.
		These preset effects are just a few samples of the changes you can make using the Perspective Filter.
	www.andromeda.com /info/perspective.html (113 words)

	David Ruether - Lens Distortion and Perspective-Correction (Site not responding. Last check: 2007-10-14)
		It turns out that we see in spherical (curved) perspective, with the same advantages for keeping tilting and swinging points of view from being unsettling, for maintaining more consistent-looking near-to-far distance proportion relationships, and for showing kinder representations of rounded objects (like people) near the image edges than a very wide angle "rectangular-perspective" view would.
		The top frame shows the original, with obvious linear distortion showing; the other two are frames with different amounts of correction applied in Adobe Premiere.
		In order to maintain as much as possible of the original horizontal angle of view, fl bits appear at the top and bottom of the "corrected" frames - but much of this is masked when viewed on a TV (it can also be covered, using the "Clip" video filter, making a slightly "letter-boxed" framing).
	www.ferrario.com /ruether/perspective-correction.htm (517 words)

	Altostorm Rectilinear Panorama Home 1.2 Download - Rectilinear Panorama is a professional tool for panorama
		It can correct any asymmetrical and irregular geometric distortions of panoramic images, recover real shapes and sizes of objects and restore their natural look.
		It is recommended to use this software to correct panoramic images of architectural constructions, groups of people, interior scenes, pieces of furniture and landscapes.
		Also, it can be used to correct optical (lens) distortion, perspective shift, image skewing or curved horizon in conventional or panoramic images.
	www.downloadjunction.com /product/store/21353 (305 words)

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