The demand for video security continues to expand with the development of the security monitoring industry, and many requirements for security monitoring will impose certain requirements on image quality. How to improve the image quality of video security, and flexible adjustment for different monitoring environments to ensure the clarity of monitoring image quality, has become an important factor in the video security market. Technically speaking, the core of ensuring high-definition picture quality is the front-end image acquisition device. Only when the image quality of the front-end image is guaranteed, can the high-definition picture quality be monitored.
ADI, the world's leading provider of high-performance signal processing solutions, has its own unique secret weapon in the field of video security, namely the HD surveillance matrix chip. Zhang Peng, manager of Analog Devices, mentioned in the ADI high-definition monitoring matrix chip: "Because the video bandwidth of the transmission is increasing, the high-frequency signal has different attenuation at different frequencies in the line, so the requirements for long-line driving are very strict. The pre-emphasis and equalization (EQ) function is added to the chip, and this function can be programmed to accommodate different line lengths.†For these features, ADI has three main HD monitor matrix chip solutions:
(1) FPGA solution, with ADV7611 HDMI receiver and ADV7513 HDMI transmitter of parallel interface, it is flexible to operate, but the layout is difficult, suitable for small matrix.
(2) Digital differential cross-matrix scheme, with HDMI Repeater (such as 16×16 HDMI matrix made of 16 ADV7623 and 4 16x16 cross-matrix ADN4604), the layout is compact and simple, and can be used as a large matrix.
(3) Analog video HD matrix (such as 750Mhz bandwidth 16x16 analog matrix ADV3227), low cost, slightly weak anti-interference ability.
Zhang Peng said: "ADI's latest products in monitoring video matrix have the following characteristics: ADI's latest product is 12x12 cross-matrix ADN4612, supporting high bandwidth up to 11.3Gb/s, DC/AC coupling, small jitter (Low Jitter), low power consumption. Now the external market needs to support 4kx2k resolution HDMI matrix, ADV7625, ADV7626, ADV7627 support 4kx2k HDMI Repeater. ADV7619 is 4xx2k resolution HDMI receiver, with FPGA and Silicon Image HDMI TX It is also possible to make a small FGPA type 4kx2k HDMI matrix. Another low-cost solution is to build a 4x4 matrix with six 4 input and output HDMI chips ADV7630."
From the perspective of market demand, the development of matrix HD is more and more prominent. After the matrix is ​​HD, whether it is networked or stand-alone operation, it retains the functions of convenient switching control, image inspection and positioning, such as alarm linkage and group switching. Wait. As a result, the development of matrix technology is moving toward compatibility. The emerging industrial Internet of Things field also requires a large number of video security applications, Zhang Peng said: "With the support of the network, data acquisition, wireless transmission, self-networking will give new features in the monitoring field. Based on ultra-low power digital Processing systems, wireless systems and power management and energy harvesting systems will enable terminal design to differentiate and platform in big data applications. In short, video security is moving toward diversification, high definition and compatibility.
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