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.
The challenge was to create a single signal encompassing three different information, and should not be mixed prior to treatment by the receiving station. The challenge was also to maintain full compatibility with the black and white positions still present in homes. Researchers are worked in order to create a video signal including red, green, blue, and black and white in the same "pipe" without them mingle.
Due to the capture of two frames each second of 1:50, the time of exposure in video (25i). The first cameras operating on the same principle as televisions analyzed the image formed by the lens with a CRT. Since the late 1980s, they have a photo sensor CCD or CMOS type. There are different formats of video images, which depend mainly on frequency of vertical sweep of images. It can be seen that there is a difference between the number of lines composing the frame and the number of lines displayed.
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.
In recent decades, scholars knew the spectral characteristics of ahuman eye, which showed a clear preference for certain colors. Moreover, they knew that the color spectrum of eyes can be divided into three primary colors, which allow for mixing to create almost all other colors of a spectrum. The color film operates by using emulsions several layers each of which is sensitive to one primary color.
When color television was first introduced it took b/w TVs to render an image, the luminance signal has been preserved and added a signal that the black and white TV would not know and therefore not appear even as a parasite signal with backward compatibility. So two color differences R'-Y and B'-Y (the 'means were added so that signals underwent own correction to a gamma curve to overcome, at the time, a problem of non-linearity restitution CRTs). By combining with luminance, it is possible to extract green.
The challenge was to create a single signal encompassing three different information, and should not be mixed prior to treatment by the receiving station. The challenge was also to maintain full compatibility with the black and white positions still present in homes. Researchers are worked in order to create a video signal including red, green, blue, and black and white in the same "pipe" without them mingle.
Due to the capture of two frames each second of 1:50, the time of exposure in video (25i). The first cameras operating on the same principle as televisions analyzed the image formed by the lens with a CRT. Since the late 1980s, they have a photo sensor CCD or CMOS type. There are different formats of video images, which depend mainly on frequency of vertical sweep of images. It can be seen that there is a difference between the number of lines composing the frame and the number of lines displayed.
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.
In recent decades, scholars knew the spectral characteristics of ahuman eye, which showed a clear preference for certain colors. Moreover, they knew that the color spectrum of eyes can be divided into three primary colors, which allow for mixing to create almost all other colors of a spectrum. The color film operates by using emulsions several layers each of which is sensitive to one primary color.
When color television was first introduced it took b/w TVs to render an image, the luminance signal has been preserved and added a signal that the black and white TV would not know and therefore not appear even as a parasite signal with backward compatibility. So two color differences R'-Y and B'-Y (the 'means were added so that signals underwent own correction to a gamma curve to overcome, at the time, a problem of non-linearity restitution CRTs). By combining with luminance, it is possible to extract green.
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