Non Display
2009
Non Display
In this posting I wish to discuss with you in detail about the two popular methods available for displaying, storing, and transmitting moving images. They are interlaced scanning and progressive or non-interlaced scanning. Let us start from the beginning and try to understand what exactly these fancy terms mean and which of the two is better.
An image is treated as a frame and each video frame is composed of a series of scan lines. Scanning takes place similar to the way we write and read text, line by line, from top left to bottom right. Both interlaced and progressive scanning techniques follow this pattern. The difference lies in the fact that interlaced scan pattern completes the scan only for alternate lines, thereby dividing a frame into two fields. One field contains all the even lines, while all the odd lines are included in the other one. A sequence of frames is played in quick succession, with the fields being displayed at twice the rate of the frames. Since the fields of a frame are taken at different times while shooting a video footage, they double the time resolution and you perceive the motion better. And this can be achieved at half the bandwidth requirement of progressive scan. But, when the fields are displayed in a different order, then they result in what is called interlace artifacts or combing.
Though the CRT screen-based televisions that used analog signals did perfectly well with color interlaced scanning, the advancement in technology called for the development of progressive scan mode. Since, the lines are scanned separately in the order that they appear, the images produced don't fade in and fade out. But the price that you pay for a crisp and clear display is a higher bandwidth, which in turn means a higher expense. But the change in display technology has made the adoption of non-interlaced scanning a must. Now, as far as your security camera is concerned, to enjoy the benefits of this technique all the equipment must be progressive scan ready.
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