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Digital Cinema Concepts
Digital Cinema Concepts HD979: Benefits of interlacing
One of the most important factors in analog television is signal bandwidth, measured in megahertz. The greater the bandwidth, the more expensive and complex the entire production and broadcasting chain. This includes cameras, storage systems, broadcast systems�and reception systems: terrestrial, cable, satellite, Internet, and end-user displays (TVs computer monitors).
For a fixed bandwidth, interlace provides a video signal with twice the display refresh rate for a given line count (versus progressive scan video at a similar frame rate�for instance 1080i at 60 half-frames per second, vs. 1080p at 30 full frames per second). The higher refresh rate improves the appearance of objects motion, because it updates their position on the display more often, and when objects are stationary, human vision combines information from multiple similar half-frames to produce the same perceived resolution as progressive full frames. This technique is only useful though, if source material is available in higher refresh rates. Cinema movies are typically recorded at 24fps, and don't benefit from interlacing.
Consumer televisions and projectors
As of 2012, most consumer televisions being sold provide 1080p inputs, mainly via HDMI, and support full high-definition resolutions. 1080p resolution is available in all types of television, including plasma, LCD, DLP front and rear projection and LCD projection.
For displaying film-based 1080i60 signals, a scheme called 3:2 pulldown reversal (reverse telecine) is beginning to appear in some newer 1080p displays, which can produce a true 1080p quality image from film-based 1080i60 programs. Similarly, 25fps content broadcast at 1080i50 may be deinterlaced to 1080p content with no loss of quality or resolution.Digital Cinema Concepts sell
Digital Cinema Concepts review: DVB
In Europe, 1080p25 signals have been supported by the DVB suite of broadcasting standards. The 1080p50 is considered to be a future-proof production format and, eventually, a future broadcasting format. 1080p50 broadcasting should require the same bandwidth as 1080i50 signal and only 15�20% more than that of 720p50 signal due to increased compression efficiency, though 1080p50 production requires more bandwidth and/or more efficient codecs such as JPEG 2000, high-bitrate MPEG-2, or H.264/AVC and HEVC.
From September 2009, ETSI and EBU, the maintainers of the DVB suite, added support for 1080p50 signal coded with MPEG-4 AVC High Profile Level 4.2 with Scalable Video Coding extensions or VC-1 Advanced Profile compression; DVB also supports 1080p encoded at ATSC frame rates of 23.976, 24, 29.97, 30, 59.94 and 60.
EBU requires that legacy MPEG-4 AVC decoders should avoid crashing in the presence of SVC and/or 1080p50 (and higher resolution) packets. SVC enables forward compatibility with 1080p50 and 1080p60 broadcasting for older MPEG-4 AVC receivers, so they will only recognize baseline SVC stream coded at a lower resolution or frame rate (such as 720p60 or 1080i60) and will gracefully ignore additional packets, while newer hardware will be able to decode full-resolution signal (such as 1080p60).
Static contrast
Static contrast ratio is the luminosity ratio comparing the brightest and darkest color the system is capable of producing simultaneously at any instant of time, while dynamic contrast ratio is the luminosity ratio comparing the brightest and darkest color the system is capable of producing over time (while the picture is moving). Moving from a system that displays a static motionless image to a system that displays a dynamic, changing picture slightly complicates the definition of the contrast ratio, due to the need to take into account the extra temporal dimension to the measuring process. Digital Cinema Concepts
Digital Cinema Concepts HD979 for sale:A clean print at a typical movie theater may have a contrast ratio of 500:1. Dynamic contrast ratio is usually measured at factory with two panels (one versus another) of the same model as each panel will have an inherent dark and light (hot) spot. Static is usually measured with the same screen showing half screen full bright vs half screen full dark. This usually results in a lower ratio as brightness will creep into the dark area of the screen thus giving a higher luminance.
One of the most important factors in analog television is signal bandwidth, measured in megahertz. The greater the bandwidth, the more expensive and complex the entire production and broadcasting chain. This includes cameras, storage systems, broadcast systems�and reception systems: terrestrial, cable, satellite, Internet, and end-user displays (TVs computer monitors).
For a fixed bandwidth, interlace provides a video signal with twice the display refresh rate for a given line count (versus progressive scan video at a similar frame rate�for instance 1080i at 60 half-frames per second, vs. 1080p at 30 full frames per second). The higher refresh rate improves the appearance of objects motion, because it updates their position on the display more often, and when objects are stationary, human vision combines information from multiple similar half-frames to produce the same perceived resolution as progressive full frames. This technique is only useful though, if source material is available in higher refresh rates. Cinema movies are typically recorded at 24fps, and don't benefit from interlacing.
Consumer televisions and projectors
As of 2012, most consumer televisions being sold provide 1080p inputs, mainly via HDMI, and support full high-definition resolutions. 1080p resolution is available in all types of television, including plasma, LCD, DLP front and rear projection and LCD projection.
For displaying film-based 1080i60 signals, a scheme called 3:2 pulldown reversal (reverse telecine) is beginning to appear in some newer 1080p displays, which can produce a true 1080p quality image from film-based 1080i60 programs. Similarly, 25fps content broadcast at 1080i50 may be deinterlaced to 1080p content with no loss of quality or resolution.Digital Cinema Concepts sell
Digital Cinema Concepts review: DVB
In Europe, 1080p25 signals have been supported by the DVB suite of broadcasting standards. The 1080p50 is considered to be a future-proof production format and, eventually, a future broadcasting format. 1080p50 broadcasting should require the same bandwidth as 1080i50 signal and only 15�20% more than that of 720p50 signal due to increased compression efficiency, though 1080p50 production requires more bandwidth and/or more efficient codecs such as JPEG 2000, high-bitrate MPEG-2, or H.264/AVC and HEVC.
From September 2009, ETSI and EBU, the maintainers of the DVB suite, added support for 1080p50 signal coded with MPEG-4 AVC High Profile Level 4.2 with Scalable Video Coding extensions or VC-1 Advanced Profile compression; DVB also supports 1080p encoded at ATSC frame rates of 23.976, 24, 29.97, 30, 59.94 and 60.
EBU requires that legacy MPEG-4 AVC decoders should avoid crashing in the presence of SVC and/or 1080p50 (and higher resolution) packets. SVC enables forward compatibility with 1080p50 and 1080p60 broadcasting for older MPEG-4 AVC receivers, so they will only recognize baseline SVC stream coded at a lower resolution or frame rate (such as 720p60 or 1080i60) and will gracefully ignore additional packets, while newer hardware will be able to decode full-resolution signal (such as 1080p60).
Digital Cinema Concepts HD979 for sale
Static contrast
Static contrast ratio is the luminosity ratio comparing the brightest and darkest color the system is capable of producing simultaneously at any instant of time, while dynamic contrast ratio is the luminosity ratio comparing the brightest and darkest color the system is capable of producing over time (while the picture is moving). Moving from a system that displays a static motionless image to a system that displays a dynamic, changing picture slightly complicates the definition of the contrast ratio, due to the need to take into account the extra temporal dimension to the measuring process. Digital Cinema Concepts
Digital Cinema Concepts HD979 for sale:A clean print at a typical movie theater may have a contrast ratio of 500:1. Dynamic contrast ratio is usually measured at factory with two panels (one versus another) of the same model as each panel will have an inherent dark and light (hot) spot. Static is usually measured with the same screen showing half screen full bright vs half screen full dark. This usually results in a lower ratio as brightness will creep into the dark area of the screen thus giving a higher luminance.
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