asp.net generate barcode to pdf A Brief History of Video Technology in Software

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version Once available, with sufficient support, DVD audio recorders finally may bring consumer audio recording completely into the digital realm Of course, copy protection and all its associated baggage will come along for the ride
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A Brief History of Video Technology
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It is unknown when the principle of persistence of vision was first discovered Since it can be illustrated by waving a burning stick in the darkness, it undoubtedly has been known since prehistoric times The phenomenon, caused by the brain holding an image for a fraction of a second after the optical stimulus is removed, led to some of the first optical illusions, such as tracing letters in the air with a bright light Much later it was discovered that a quickly flickering light appears to be continuous At low light levels the flicker threshold or fusion frequency is around 50 times a second2 Even later, in the 1830s, it was learned that a series of
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Critical fusion frequency depends greatly on the ambient light level In a dark movie theater, a flicker rate of 48 times per second is sufficient (each frame is flashed twice) European PAL television refreshes at 50 times a second (50 Hz), which is just at the limit for home viewing and is noticeable by some people, especially in well-lit environments or with bright video images American NTSC television, at 60 Hz, is generally adequate for most environments Many computer monitors flicker at 72 Hz or higher in order to abate eyestrain and mental fatigue in brightly lit offices
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3 Most texts on video and motion pictures explain that persistence of vision is what makes it possible Although there are conflicting opinions, this is apparently inaccurate a myth that has passed through generations since Peter Mark Roget s definition in 1824 (Roget s term was misappropriated, since he was not describing perception of motion) It is true that there is a physiologic mechanism by which the eye sees afterimages (some positive, some negative) after a light source ceases, but the scientific consensus is that it has little or nothing to do with flicker fusion or apparent motion This has been understood since at least the beginning of the twentieth centuryThat humans perceive a series of changing still images as motion, without registering periods of blackness in between, is a psychologic characteristic of the brain (sometimes called the phi phenomenon), mostly unrelated to persistence of images on retinal photoreceptors or within the optic nerve Research in high-speed filming and computer video games has shown that we perceive motion quality improvements at frame rates of 60 and 70 Hz and higher far faster than the 24 Hz of film used for DVDs If motion perception were based primarily on a buildup of afterimages, we would see blurry streaks or multiple images, especially when moving our eyes or head For example, waving your hand in front of a strobe light demonstrates physiological persistence of vision: You see more than five fingers However, a waving hand on a film or television screen produces no distortion and the hand looks normalThis is so partly because the still images of the hand are blurred by motion captured during shutter exposure time, but it is mostly due to the psychological illusion of apparent motion
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Figure 22 Timeline of video technology
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Figure 23 Revolving picture toy
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still images shown in rapid succession produces the illusion of motion (see Figure 22 for an outline of the history of video technology) Revolving-picture toys with strange names such as zoetrope, phenakistiscope, thaumatrope, praxinoscope, and fantascope (see Figure 23) began to capitalize on this particular feature of human perception, which is what makes modern motion-picture and video technology possible3 Early experimenters discovered that a continuous stream of images merely causes blurring as the eye attempts to track the motion They learned that each image has to be motionless long enough for the brain to acquire it Most of the movingimage toys used slits through which the image was momentarily viewable Happily, the brain ignores the absence of the image This technique of using a slit or shutter to briefly show a still picture as it moves is still used today in movie projectors Many years later it was discovered that the eye employs high-frequency tremors to create snapshots as part of its image-acquisition mechanism By rapidly jerking back and forth, the eye creates multiple still images that it then passes on to the brain for processing4
4 Involuntary saccadic motion occurs about 10 to 25 times a second, typically over about 10 degrees of arc Voluntary saccadic motion (such as when reading or during intense visual search) happens about 3 to 5 times a second
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