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The two frames below have titles, and a radio button outside them, presumably to select one or the other. The lower of the two boxes is dimmed, or disabled, indicating its widgets cannot be selected. Each of the frames (as well as the area outside of the frames) has a checked radio button, while normally only one of the buttons can be selected.
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Active camouflage provides concealment by making an object not merely generally similar to its surroundings, but effectively invisible with "illusory transparency" through accurate mimicry, and by changing the appearance of the object as changes occur in its background.
By using two parabolic cylindric mirrors and one plane mirror, the image of the background is directed around an object, making the object itself invisible - at least from two sides. Invisibility is the state of an object that cannot be seen. An object in this state is said to be invisible (literally, "not visible").
It is the frame decorated with square tiles that form the vertical rectangle separating the stage (mostly behind the lowered curtain) from the auditorium (the area with seats). The fourth wall is a performance convention in which an invisible, imaginary wall separates actors from the audience. While the audience can see through this "wall", the ...
Invisible (or imperceptible) structured light uses structured light without interfering with other computer vision tasks for which the projected pattern will be confusing. Example methods include the use of infrared light or of extremely high frame rates alternating between two exact opposite patterns.
Invisible comments are useful for alerting other editors to issues such as common mistakes that regularly occur in the article, a section title's being the target of an incoming link, or pointing to a discussion that established a consensus relating to the article.
1135×624 4fsc decoded frame (Luma) from a Composite 4fsc decode of a LaserDisc via ld-decode.. In a raster scan display, the vertical blanking interval (VBI), also known as the vertical interval or VBLANK, is the time between the end of the final visible line of a frame or field [1] [2] and the beginning of the first visible line of the next frame or field.