Video brings together all the techniques for recording and restitution of moving images with or without sound, in an electronic medium and not of photochemical kind. The TV picture is a series of line scans, from the top, and ending at the bottom of the screen. In the early days of television, the quality of phosphorescent tube elements was poor. Thus, online videos and games beam sweeping the bottom of a screen, the top disappears, resulting in a flickering, strongly felt by the human eye at 25 Hz or 30 Hz.
And the rest of the world uses PAL or Phase Alteration Line (distinction of the two differences and sent along with different phases). The chrominance signal is a subcarrier luminance. The number of lines, the scanning speed, the type of positive or negative signal to the issue are part of standards according to country and has nothing to do with color diffusion standards (PAL, SECAM, MESECAM and NTSC).
The cameras, which function as an inverted TV also adopted this interlacing scan. As regards, the first half of an image, a 1st shot defines all the odd lines, and one half frame, a second shooting defines the even lines. The important thing to understand here is that two shots are distant in time (half image).
And even if these two shots are complementary to a spatial point of view (the two scans complement inside the frame), these two shots do not display the same content! If a subject moves in a field, it will have a different position on each of two fields: one then has a zigzag effect on each frame.
Free lines are partially taken advantage of: they place the signals teletext, subtitling and also the time-code of professional video equipment. There are two scanning frequencies of the image: The vertical scanning, which takes place from top to bottom is used to compose the image. It is done 50 or 60 times per second.
These solutions were found and implemented. Thus were developed in the United States (NTSC0, SECAM in France and PAL in Germany. Coding transforms RGB black/white color-compatible signal. NTSC, PAL and SECAM are three types of mutually incompatible encodings. Transformation from one type of encoding to another is called transcoding. None of the three solutions is nevertheless transparent, far from it. A transcoded signal suffers from more or less visible defects depending on the coding artifacts.
Analog video standard across the world include NTSC, PAL and SECAM. PAL or SECAM standards have no relationship with the scan of an image, these standards only allow you to add color to black and white images. In the early days of television, only the luminance defines the image by a number of horizontal dots and also by three factors shade of gray.
Engineers used the additive synthesis of red, green and blue (contrary paper absorbs light and uses the compound of subtractive cyan, magenta and yellow) Red, green and blue are the primary colors of additive synthesis. Similarly, the cyan, magenta and yellow are the primary subtractive colors. Shooting in color is done through an optical prism, which splits light on three sensors, otherwise there is red, green and blue filters.
And the rest of the world uses PAL or Phase Alteration Line (distinction of the two differences and sent along with different phases). The chrominance signal is a subcarrier luminance. The number of lines, the scanning speed, the type of positive or negative signal to the issue are part of standards according to country and has nothing to do with color diffusion standards (PAL, SECAM, MESECAM and NTSC).
The cameras, which function as an inverted TV also adopted this interlacing scan. As regards, the first half of an image, a 1st shot defines all the odd lines, and one half frame, a second shooting defines the even lines. The important thing to understand here is that two shots are distant in time (half image).
And even if these two shots are complementary to a spatial point of view (the two scans complement inside the frame), these two shots do not display the same content! If a subject moves in a field, it will have a different position on each of two fields: one then has a zigzag effect on each frame.
Free lines are partially taken advantage of: they place the signals teletext, subtitling and also the time-code of professional video equipment. There are two scanning frequencies of the image: The vertical scanning, which takes place from top to bottom is used to compose the image. It is done 50 or 60 times per second.
These solutions were found and implemented. Thus were developed in the United States (NTSC0, SECAM in France and PAL in Germany. Coding transforms RGB black/white color-compatible signal. NTSC, PAL and SECAM are three types of mutually incompatible encodings. Transformation from one type of encoding to another is called transcoding. None of the three solutions is nevertheless transparent, far from it. A transcoded signal suffers from more or less visible defects depending on the coding artifacts.
Analog video standard across the world include NTSC, PAL and SECAM. PAL or SECAM standards have no relationship with the scan of an image, these standards only allow you to add color to black and white images. In the early days of television, only the luminance defines the image by a number of horizontal dots and also by three factors shade of gray.
Engineers used the additive synthesis of red, green and blue (contrary paper absorbs light and uses the compound of subtractive cyan, magenta and yellow) Red, green and blue are the primary colors of additive synthesis. Similarly, the cyan, magenta and yellow are the primary subtractive colors. Shooting in color is done through an optical prism, which splits light on three sensors, otherwise there is red, green and blue filters.
About the Author:
You can visit www.x-zik.net for more helpful information about Overview Of Online Videos And Games.
No comments:
Post a Comment