Compression method of digital video signal in application television for management and control of unmanned aerial vehicles
The analog and digital image transmission systems used to control unmanned aerial vehicles are considered, it is proposed to use digital transmission systems compatible with analog systems, the relationships for the space-time function and the spectrum of the discretization structure for the interlaced raster are analyzed and on their basis it is concluded that the even and odd fields when implementing a digital video compression method. The method of compression of the digital video signal stream in the television communication channel when controlling unmanned aerial vehicles using the psychophysical features of human vision, which allow, without complicating the equipment, to achieve higher results of visual image quality and at the same time does not require a large delay and computational complexity. The division of fields into groups of 3 types is envisaged: O-fields, which play the role of supporting; even Nfields encoded by prediction based on the previous field within one frame; odd M-fields encoded with a prediction based on a previous odd field from another frame. Methods are proposed that increase the efficiency of digital stream compression in a television communication channel. The method is adapted to forcibly changing the current coded field to the reference one, in the case of a situation where it is impossible to restore the O-field or the M-field due to channel errors. Another difference from the compression standards used in broadcast and applied television lies in the low latency in encoding and decoding, which is the duration of the 1 field required for signal processing, which plays an important role in controlling unmanned aerial vehicles.