principal point


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principal point

[′prin·sə·pəl ′pȯint]
(optics)
The intersection of a principal plane with the optical axis.

principal point

As it relates to photography, it is the foot of the perpendicular to the photo plane through the perspective center. Generally, it is determined by the intersection of the lines joining opposite or diagonal collimating or fiducial marks. See also collimating marks.
References in periodicals archive ?
Intrinsic parameters are associated with optical and geometrical aspects of the camera such as focal length, principal point, skew, and lens distortions.
We call on the people to demonstrate and express themselves, because the right to demonstrate is a principal point of the plan" of Annan, Burhan Galioun told AFP hours after the truce took effect.
Internal resources or outsourcing is the principal point of discussion.
Tyne and Wear Development Company is the principal point of support for growing businesses and investors in the region.
The airport is the principal point of entry for visitors to Makkah and Madinah, peaking in the month of the annual Hajj when KAIA serves almost 4 million pilgrims.
McClean, 40, whose principal point scorers were Cape Blanco, Canford Cliffs and Workforce, had been in pole position for some time.
Or, le fait qu'il reste, apres au moins 10 ans d'essais cliniques de haute qualite sur l'HBP, une telle panoplie d'options therapeutiques illustre bien les difficultes lorsqu'il s'agit d'etablir la superiorite nette d'un traitement par rapport a un autre quand la qualite de vie est le principal point de mire.
According to Kries, Strauss's principal point is that "the Christians had compromised philosophy as a way of life, whereas the Arabic philosophers had practiced such a life" (emphasis in the original).
In that role, he acted as a liaison to all Major League Club public relations personnel and to other baseball organizations and was the principal point of contact for the Baseball Writers Association of America and other media on all baseball matters pertaining to the Office of the Commissioner.
President Obama recognized that America's image in the world was, to say the least, tarnished and made it a principal point of his campaign to insist that he would be able to improve our reputation.
When a Department employee tragically lost his life last summer in an act of terrorism, Casualty Assistance was the principal point of contact for the family, providing support and assistance with a variety of issues, attending his funeral and helping his bureau plan a memorial service here in the Department.
Gherardi will be the principal point of contact for the company's added capabilities.