Image scanning methods are divided into progressive scanning and interlaced scanning. The scanning of the electron beam in the horizontal direction becomes a line scan.
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The way in which the electron beams are sequentially scanned from left to right and top to bottom is progressive scan. The scanning of the electron beam in the vertical direction is called frame scanning, also known as field scanning.
Interlaced scanning is to scan one frame of image into two fields. The first field scans odd lines and becomes odd fields. The second field scans even lines for even fields. The odd and even field images are mosaic together to form a complete image.
From the scanning principle, progressive scanning is better than interlaced scanning. However, in order to make the image continuous without flickering for progressive scanning, it is necessary to change the frame 50 times per second, that is, the frame frequency is 50 Hz, which makes the bandwidth of the image signal too wide, if the quality of the transmitted television signal is guaranteed, The TV system equipment will be complicated and the cost will be greatly improved. In order to compress the bandwidth of the image signal and at the same time overcome the flicker phenomenon, the current broadcast television signal is interlaced by the cinema technology.
Since the line scan frequency of interlaced scanning is half of that of progressive scanning, the spectrum of the television signal and the channel bandwidth of the transmitted signal are also one by one, and the channel utilization is improved in the case where the image quality is not degraded. Doubled. Due to the reduction in channel bandwidth, the complexity and cost of the system and equipment are correspondingly reduced.
The progressive scan TV set adds a new circuit technology to the TV receiver, transforms the interlaced TV image signal transmitted by the TV station into progressive scan, and then displays it on the screen. The biggest advantage of progressive scan color TV is that it overcomes the phenomenon of flickering and line structure between ordinary color TV display images, and the displayed image becomes more delicate.
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