At the moment in Russia television broadcasts in the SECAM standard (625 lines), the image is displayed with a resolution of 720 by 576 pixels and a frame rate of 25 per second.
A number of foreign countries broadcast in PAL format, which differs only in the color coding algorithm.
It is believed that the most technologically advanced countries broadcast in NTSC 3.58 format. In this standard, the number of frames per second is 29.97, and the screen resolution in digital representation is 720 by 480 pixels. Thus, the NTSC standard has a higher frame rate, but the vertical resolution is lower.
There are two ways to form an image - progressive and interlaced. With progressive imaging, each frame has all the lines of the image, i.e., for example, at 30 frames per second, 30 full frames will be displayed. With the interlaced method of image transmission, even frames will display even lines of the original image (full frame), and odd frames will display odd lines. An interlaced image looks somewhat blurry compared to a progressive image, but it can significantly reduce the amount of information transmitted. Many people do not like the flickering created by an interlaced image.
A progressive image is denoted by the letter p (progressive), for example 720p. Interlaced image - indicated by the letter I (interlaced), for example 1080i.
The old PAL, SECAM and NTSC 3.58 formats use an interlaced way of transmitting information.
Home | Articles
April 20, 2024 07:44:08 +0300 GMT
0.004 sec.
