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Screen Processor:
Name:admin  time2011.09.27  Read:

Screen Processor:
In principle, the best way to record a signal is 1 to 1, it is to use a single camera VCR admission intake screen, 30 frames per second, recorded, without any compression, the higher the resolution, the better (usually S -VHS). But if you need simultaneous monitoring of many sites, one way to make the system with a large number of devices and more, supplies and manpower management fees increased substantially, to solve the above problems, image processor came into being. Image processor to maximize simplify the system, improve the efficiency of operation of the system, usually with a monitor display multiple camera images or a VCR recording multiple cameras signal.
Principles and classification
Picture processing equipment can be divided into two categories:
One for the Quad (mostly four splitter Quad), four splitter (Quad) is four video signals simultaneously digitized by pixel compression method compressed into a single screen for each 1/4 screen size, respectively placed in the signal 1/4 position on the monitor combined into a quad display. The screen is divided into four screens, VCR simultaneously admitted four screens in real time. VCR to treat it as a single picture to deal with. This way only the coding process, during playback not subject to the decoder, although there are many quad allows screen to full screen during playback loopback, but only electronic amplification, that is 1/4 of the screen zoom into a single screen, quad broadcasting because all of the action, it would sacrifice picture resolution and quality. When the requirements of the entire action on the screen resolution is higher than the requirements, quad is a good choice. Such as industrial process control and gambling.
Quad has four divisions, 9 divisions, 16 divisions of several that can be simultaneously displayed on a monitor 4,9,16-camera image can also be sent to the VCR recording. Quad is one of the most commonly used equipment, its cost performance is also better image quality and continuity to meet most requirements. Nine divisions and 16 divisions expensive, but each segmented image resolution and continuity will decline, videos ineffective. Another six split, 8 split, dual quad devices, but the image ratio, clarity, continuity is not ideal, utilization of a smaller market.
Another type of multi-processors (Multiplexers), but also a frame compression processor is based on the smallest unit of an image - field or frame, or 1/60 second (field switching) or 1/30 sec (frame switching) of sequence encoding the individual image processing time, according to the order of the camera recorded on the tape, the identification code encoding, video playback, remove the same identifier stored in the corresponding image focused on the image memory, and then sent to the monitor in the compressed pixel multi-screen display. This technology allows the VCR to record each camera in sequence input screen. Each frame is full screen (if the system has only a single field to take a picture, the resolution will be reduced to half), so there will be no loss in picture quality. However, the screen refresh rate of the number of cameras but was divided up, so there will be delay in the screen phenomenon. If you want to record 10 cameras of the screen, each camera can only take 3 per frame. While playback is still 30 per frame, but not 30 different frame. When using multiple processors, the recorded per second frame number will be reduced. The market is not difficult to see that the frame 16 or more processors connected cameras and DVR with 960 hours for a long time to connect. This combination will cause the screen every few minutes to record a result, compared with other methods seem less efficient.
A block diagram of the processor frame
Frame Processor images from analog to digital and microprocessor quality is very important
Multi-tasking processor with Quad advantages and disadvantages
Quad Quad screen action can be monitored in real time with no delays, when recording is composed of a four-picture video signal recording, video playback is also a four-way split real-time playback. Some products can be electronic zoom (Zoom) style enlargement process, but its small and pixel resolution dropped significantly, so that does not make sense, it can be considered that it is not the big picture playback. Multiplexers Pixels but because they do not lose time lost, so when the video playback generate delays, animations strongly, as seen by the picture is not continuous, playback can be divided playback, playback can be a large screen. From the above analysis Quad advantage is no missing records, evidence is good, not the big picture disadvantage is not (in the situation without sacrificing pixel under) playback, and multi-tasking processor Multiplexers playback function is good, can big screen playback, but also multi-screen playback, the disadvantage is losing image generated animation.
Slicer features: Most products have all or part of the following
(1) simultaneous multi-screen display image, you can also display a single frame, set the automatic switch with 4 or 8 (Dual Page Quad) camera input terminals, there are usually two video output terminal, all the way to video output, four screen image for the record, the other way for the video output for use with a monitor connected can choose to display a single screen image can also be displayed in the order 4 input images.
(2) real-time display video output (60 or 50 frame / second), four Quad image processing technology is four simultaneous digital video signal processing, reduced to full screen every 1/4 of the screen size and position at different locations, resulting in a monitor combined into four split screen display. Since four Quad four screens simultaneously processed signal, and therefore can be used for real-time video surveillance, motion picture without a delay phenomenon. Has now developed a high quality of the IC, to improve real-time speed.
(3) the time and characters can be superimposed (built-in clock and subtitles), more than can be displayed on each screen in English or figures to indicate the camera number and location information, generally up to eight words.
(4) with a duplex performance device, playback can run four split screen, you can specify an image to enlarge it to monitor, but the picture quality is rough, the quality is not high.
(5) with built-in buzzer alarm inputs and linkage capabilities, video motion detect (Motion Detection), or video with motion detector alarm detector alarm system consisting of linked.
(6) Fast playback function, still picture function, timing generator, single-channel audio output function.
(7) image loss alarm function, you can retain the final screen.
(8) For dual four screens: eight camera inputs, can independently adjust its brightness, contrast, color and color, the border color to distinguish between two quad display.
(9) connected to the computer with the RS232 port function, RS232 remote control functions, the future can be connected to the network.
(10) Menu Settings feature
(11) PIP function with the image enlarged
(12) high resolution display 720x576 (PAL), 720x480 (NTSC), sixteen million kinds of true color output
Future capabilities development trends
Since quad frame with emphasis on its screen clarity and immediacy, while the IC is affecting the quality of the key. Currently constantly develop new IC, improved picture quality. In addition, the progress of the microprocessor to control and management are different IC (such as video IC, memory IC) better capacity.
Multi-tasking processor functions: Most products have all or part of the following
● Duplex frame compression function with multiple monitors simultaneously.
● Can connect four cameras and a loop output.
● Instant quad display (60 or 50 frame / sec).
● High Resolution Display 720x576 (PAL), 720x480 (NTSC).
●● Sixteen million kinds of true color output.
●● Video loss alarm inputs with automatic detection.
●● Camera inputs, can independently adjust its brightness.
●● Four split-screen and four-camera automatic sequence display can be output simultaneously.
●● Built-in buzzer alarm input.
●● Can store five alarm recording pen.
●● Optional various long VCR recording mode.
●● VCR according quad or full screen playback images.
●● VCR playback picture can be enlarged.
●● VCR video image can be directly output to the TV.
●● RS232 remote control function.
●● Industry standard 1U rack chassis.
Future capabilities development trends
● Products Internet technology
With the rise of Internet, the future quad processor and frame will move toward Internet, the product will be designed to function with Internet links towards multi-screen remote monitoring system development.
● Product personalization, a small variety of modes, will become more common.
To meet the needs of different regions of different products, product design will be unique, not just a small amount of sales also increased diversity in appearance and function.
● Product features enrichment
As technology increasingly mature, the previous platform, mobile sensor (Motion Dection), etc. all become must-have feature built. In addition, the built-in Modem, an alarm detection, immediately dial, it will become a trend.
● Added value services
Product towards Internet based and feature-rich technology, the quad processor and frame not only provides users with a simple image processing functions, due to a combination of modern science and technology development that will expand the range of services provide users with more space .
Quad with simultaneous multi-video matrix switching system integration trend.
Four frame will move towards segmentation and remote monitoring products, technology development in the CCTV market in the development of new applications to open up new markets. Irrespective of how changes in function, the transmission frame, the playback picture sharpness and speed that is still the most important quality requirements.
The type of the picture processing apparatus and the typical brand
Currently on the market Quad (another color, black and white points, single-function, dual function of the points) have
● Simplex four Quad: NQC-6015 (color), WV-MS424 (color), NQB-601 (black and white), NQB-604 (black)
● Duplex four Quad (ie, playback can be achieved by electronic amplification dilute surface display): NQC-605 (color)
● Dual Quad Quad (8 cameras can be connected to two faces of four screen switching display): NQC-608 (color), WV-MS428 (color), NQB-612 (black)
The image multiplexer (Multiplexers frame field switching) are more diverse (another color, black and white points, single-function, full-duplex and duplex of the points), there is
Simplex processor (field switching): WV-FS28 (4 way), WV-FS29 (9 Road), WJ-FS216 (16 channel)
Duplex processor (field switching): WV-FS38 (4 way), WJ-FS216 (16 channel)
Full duplex Processor: WJ-FS616 (with system control functions)
Sixteenth Street field switching (WV-FS616) (with system control functions), MV94E, MV99E, MV96E, MV16I (black and white)
Single function, dual power, the concept of full-duplex
The picture processor (Multiplexers) concerned, there is a single function, double power, fully duplex type, and these three concepts are difficult to define precisely many users, here, that defined above:
The only difference is that all of the input video signal is recorded at the same time
1 single function: multi-screen video and multi-screen monitor can not simultaneously, both choosing one; a. Only multi-screen monitor, you can not multi-screen while recording, called Quad, b only multi-screen video, no more screen time monitoring, known as field or frame toggle switch
(2) Dual power: multi-screen video and multi-screen monitoring can be performed simultaneously, independently of each other; namely: the state can watch video multi-split screen or full screen images, also available during playback to see full screen or split screen
3 full-duplex: simultaneous connection of two recorders, one for video, and another for playback, the two non-interfering. Frame Processor can be followed by another one monitor and VCR, received a total of two monitors and two sets VCR, cross-time monitoring, recording and playback, you can connect two monitors and two recorded like a machine, one of the operations for video and one for video tape playback.
Screen device application of some misunderstanding
Picture processor is losing some image quality for the system is simple, saving material, but the important thing is security monitoring is to identify the offender characteristics, do not over-emphasize the details of the process of committing the crime, it should be able to fully bear the screen animation. Performance evaluation of the merits of multi-Quad is the key image processing speed and clarity of the screen.
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