4K resolution, also called 4K, denotes a horizontal image resolution in the order of 4,000 pixels. In most cases, the image resolution has a value of around eight megapixels. The value "4K" does not indicate which brightness and color values are coded in the images.
Digital displaying devices, such as computer monitors, monitors, televisions or projectors, as well as recording devices, such as digital cinema cameras or digital cameras, with a column number of 4000 columns or more can be marked with the attribute "4K". This makes it clear that these devices are able to process images with this column number completely without having to combine pixels (down sampling). Images with lower image resolution can be displayed in full format on ultra-high resolution playback devices using up sampling or, as in the case of Full HD, TV line doublers.
The abbreviation 4K is also frequently used for various purposes for the collection, storage and transmission of image data:
The Serial Digital Interface (SDI) is primarily used for the transmission of uncompressed and unencrypted video data via coaxial cable or fiber optic. It is mainly used in the field of professional television studios and television broadcasters. The SDI interface is specified by the Society of Motion Picture and Television Engineers (SMPTE) and represents a further development of analog video standards such as PAL and NTSC method. The HD-SDI extension according to the SMPTE 292M standard is currently the predominant connection for the transmission of uncompressed picture signals for HD, digital intermediate and digital cinema in the studio and production environment. Picture, sound and metadata can be transmitted over all HD-SDI connections. HD-SDI, like SDI in general, is mainly found in professional video devices, for consumers interfaces of lower performance have established themselves. HD-SDI devices are usually only found in studios, rental houses and cinemas. A relatively new field of application is video surveillance systems, where this standard can be used to transmit images from special HD cameras over existing coaxial cable installations. HD-SDI thus enables high-resolution images in this sector without a complete conversion to IP video.
• Compatible with any Serial Digital Signal up to 3.0 Gbps
• Available with internal optics for use with a single optical fiber
• Standardized channels for both CWDM bands for compatibility with Python™ systems
• Passes SDI embedded audio and all ancillary data
• Input equalization and reclocking for SDI video on buffered outputs
• Available in any custom configuration for Bi-Directional Transport up to 16 total channels
• Real-time status LED indicators for troubleshooting and monitoring
• DWDM systems available by request for higher density systems
It’s not always easy to find a manufacturer that offers really high standards of professional 4K solutions together with magnificent fiber optic electronics. Thor Broadcast has used various multiplexing techniques to transmit 4k SDI signals over Fiber to easily transport these super UHD 4k signals from camera to appliance distribution.