| Digital video post-processing is a kind of digital signal process technology that faced to diversity of digital television formats. Analog and digital video signal will coexist in a long time, so the TV set must be compatible for both kinds of formats. Hence, the chip in the TV should have the ability to convert formats between each other and to enhance the vision effect of the TV picture.In this dissertation, basing on digital video post-processing chip, we focus on the following two fields: external memory SDRAM controller and generation of video display format.We not only introduce their design methods,but also do some further rearch work for following edition.In video post-processing, the main problem that we face is: enormous data flow,high speed and complicated video display format.The advantages of SDRAM are that it is very small,very cheap and fairly faster,so it is the best selection of external memory.SDRAM stores all the required data during the whole video post-processing.it is a base for all work to go on wheels. In order to solve the problem of enormous data flow and high speed.the design of SDRAM controller is very pivotal,so we provide the design method of SDRAM controller in detail based on the introduction of SDRAM'basic operation.At the mean time, In order to save manpower and time in the following edition, we realize a universal SDRAM controller with high applicability in this dissertation.Our video post-processing algorithm can only convert several tipycal types of interlaced signals to de-interlaced signals.while the 21 types of video display formats must be achieved by video display module. In this dissertation.we provide the design method of video display module in detail based on the introduction of multiplicate video display formats.At the mean time,in order to improve image quality further, by analyzing and comparing a variety of currently popular image sealer methods.we provide a alternative way for selecting appropriate image sealer methods. |
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