一种外视频叠加显示控制接口的设计与实现

摘要

The display control interface is one of the important portions of graphic processing chip. The graphic data drew by graphic pro-cessing engine should be transformed to video signals by display control interface before output to display instrument. FPGA chip was used to implement functions of video input and overlay,if the graphic processing chip has not these functions,in aeronautical field. Dis-play control interface with external video input and overlay functions makes the graphic processing chip more flexible, and makes the composite display system smaller and lighter without using FPGA chip. Design and implement a video overlay display control interface, which supports external video input and overlay,and cutting,whirling,gamma correction,HSV adjusting and scaling for video source and graphic source. The design has passed the virtual verification, and meets the functional and performable requirements of graphic process-ing chip.%显示控制接口是图形处理器芯片的重要组成部分之一。图形处理引擎绘制出的图像数据必须通过显示控制接口组织成标准格式的视频信号，才能输出给显示设备。我国航空机载领域使用的图形处理芯片大多不具备外视频输入及叠加功能，通常采用附加FPGA芯片实现这些功能。因此具有外视频输入及叠加等功能的显示控制接口，实现了图形绘制和外视频叠加等功能的集成，使得图形处理器芯片的功能更加丰富、应用更加灵活，也使得在某些应用中可以省去附加的FPGA芯片，能有效减小板面积及体积。文中设计并实现了一种外视频叠加显示控制接口，支持外视频输入及叠加，支持图像源和视频源的剪裁、旋转、伽马校正、HSV调整和缩放。设计通过了虚拟仿真验证，功能和性能均满足图形处理器芯片的要求。