32results about How to "Precise rate control" patented technology

This invention discloses the realizing ATM network flow control device and method based on FPGA.

The invention belongs to the video encoding field and provides a code rate control method and a code rate control device. The objective of the invention is to solve the problem of incapability of accurately controlling a code rate caused by large deviation of an overall code rate and a target code rate which is further caused by a situation that code rate deviation cannot be timely corrected in the prior art. The method includes the following steps that: parameters required by the encoding of an encoder are received and configured; and the encoder is controlled to encode the n-th GOP unit of video data according to the parameters and calculate the cumulative rate deviation of the first GOP unit to the n-th GOP unit; and the target code rate of the (n+1)-th GOP unit is adjusted according to the cumulative rate deviation until the encoding of the video data is terminated. According to the code rate control method and the code rate control device provided by the technical schemes of the invention, the cumulative rate deviation of GOP units of which the encoding has been completed currently is calculated, and the target code rate of the next GOP unit is adjusted according to the cumulative rate deviation, and therefore, the overall code rate can be dynamically controlled in a video encoding process so as to be made approximate to the target code rate, and code rate accurate control can be realized.

The invention discloses a precise rate control method for intra-frame coding and relates to the technical field of digital image and video coding. The rate control method for intra-frame coding comprises the steps of: dividing a frame of images into block groups; describing complexity of the block groups by utilizing a sum of absolute values of gradients among adjacent pixel points in the block groups, and determining a quantization step of each block group by using an index model for a ratio of a coding data amount to the complexity. Therefore, rate control at the block group level is realized, and the purpose of precise control on the rate is realized.

The embodiment of the invention provides a control method and device of feed water flow in the runback process. The method includes the steps of obtaining the deviation between the current main steam pressure value of a direct-current constant-pressure operation type coal-fired unit and the set main steam pressure value and obtaining the deviation between the current intermediate point temperature value of the direct-current constant-pressure operation type coal-fired unit and the set intermediate point temperature value after runback working conditions occur in the direct-current constant-pressure operation type coal-fired unit; and for the runback working conditions of different types, adjusting the preset rate of the feed water flow according to the deviation between the current main steam pressure value of the direct-current constant-pressure operation type coal-fired unit and the set main steam pressure value and the deviation between the current intermediate point temperature value of the direct-current constant-pressure operation type coal-fired unit and the set intermediate point temperature value. According to the scheme, the preset rate lowering the feed water flow is corrected in real time, and therefore the main steam pressure and the main steam temperature needed by operation can be accurately controlled, and the RB success rate can be increased.

The present invention relates to a code rate control method based on space-time domain context and motion complexity, comprising: based on the R-λ model, before C0 encoding, its model parameters α and β are updated for the first time; the current basic unit C0 encodes; wait for all the basic units in the frame where C0 is encoded, and then update the second-step parameters of the current basic unit; the model parameters after the two-step parameter update will be used to guide the target bit allocation of the basic unit layer; definition The relative motion complexity coefficient of the current basic unit C0 is used to represent the intensity of motion of different basic units; the Wi,j of the current basic unit C0 is used to adjust the λ value of the current basic unit, so that the λ value adapts to the intensity of motion of different basic units, so that Achieving the goal of allocating more bits to basic units with more motion. The invention can ensure that the basic unit block with higher motion complexity is divided into more target bits, thereby helping to improve the quality of the video.