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High Definition Technology

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HD surveillance technology High definition (HD) has taken the world by storm. Since its widespread introduction in the early 2000s, HD technology has replaced old standard definition television programs and the monitors we view them on. The reason for the rapid success of the HD revolution is obvious: HD delivers far crisper images with far greater detail, for breathtakingly lifelike imagery. Image quality is simply unsurpassed. HD video technology is characterized by three distinct features. HD video is displayed on an HD monitor capable of showing up to 1080 lines in the vertical display. Displays with 720 lines are also considered HD, although resolution is slightly less than with 1080. Old, standard definition (SD) television monitors only displayed 480 lines of visual information (lines are composed of strings of individual pixels). Secondly, HD technology is differentiated by its scanning system. Systems feature either progressive scanning (for example; 1080p), or interlaced scanning (for example; 1080i). Without getting too technical, suffice it to say that progressive scanning involves refreshing every line of video information on the screen each time an image is “refreshed.” With interlaced scanning, only every other line is refreshed during a given refreshing. A second pass refreshes the second set of lines. While this can yield excellent resolution for static images, this approach tends to yield blurred moving images. Accordingly, progressive scanning is superior for video that displays moving objects. Finally, HD video image quality is also determined by the number of frames displayed per second. Even before the dawn of moving pictures, scientists noticed that the human brain can be tricked into perceiving static images as seamless moving pictures if the images are viewed in sequence, at a rate of at least 24 frames per second. Most HD video consists of separate frames of photographs, “stitched” together by the brain itself when viewed at 24 frames per second, or greater. When frame rates fall below this minimal threshold, video can appear choppy.

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