38results about How to "Reduce the transmission bit rate" patented technology

A method and device for coding of digital video sequence, wherein an indication of quantization parameter (QP) is provided in the encoded bit-stream for decoding purposes. The QP related information is indicated by introducing a sequence level quantization parameter value SQP. More specifically, instead of coding the absolute values of picture / slice QPs, an indication of the difference ΔQP between the sequence level quantization parameter SQP and the picture / slice QP is provided. This eliminates the need to transmit a full QP for every picture / slice, and enables a statistically smaller difference value to be transmitted, thus providing a reduction in transmission bit-rate. The difference value is subsequently used in a corresponding decoder to reconstruct the picture / slice QP.

A hardware coprocessor architecture calculates the Difference-of-Gaussian (DoG) pyramid of an input image and extracts from this the interest points to be used in several image detection algorithms. Advantages of the architecture include the possibility to process the image by stripes, namely by blocks having one dimension coincident with the input image width, in the absence of an input frame buffer and the possibility to avoid RAM memory. The coprocessor is suitable to be tightly coupled with raw image sources like sensors.

Systems and methods for providing imaging content using spatially varying encoding quality. Imaging content may be acquired using spherical lenses (e.g., fisheye). When viewing spherical imaging content, spherical to planar image transformations may be utilized. Such transformations (e.g., equirectangular) may be characterized by spatially varying image distortion. Transformed images may be encoded. Encoding process may be configured based on spatially varying encoding quality. Encoding quality may be configured based on the transformation such that portions of the transformed image characterized by greater distortion may be encoded using lower quality (e.g. greater QP values); portions of the transformed image characterized by lower distortion may be encoded using greater quality (e.g. lower QP values). Such encoding may produce a bitstream characterized by a lower bitrate for a given quality and / or better quality for a given bitrate as compared to an encoding process that may apply a uniform encoding quality.

The method includes steps: first, after descending sampling video steam, carrying out encoding so as to obtain a basis steam; next, decoding and ascending sampling the said basis steam so as to obtain a rebuilding stream; subtracting the rebuilding stream from video steam so as to obtain a residue stream; then, carrying out edge detection analysis for the said video steam so as to obtain gain value of each pixel in the said video stream; finally, multiplying the said residue stream by gain value, and encoding the multiplied result so as to obtain a enhanced stream. The invention subdivides type of each pixel in order to obtain more accurate gain value. Thus, under precondition of ensuring image quality, the invention reduces quantity of transferred data further as well as reduces rate of transmission code needed by enhanced layer.

The invention provides a secondary video data coding method. The method comprises following steps of: coding acquired video data in a first preset way so as to acquire first image data; coding the acquired image data in the YUV format in a second preset way so as to acquire second image data; and carrying out network transmission on the second image data. According to the invention, it is achieved that video resolution is unchanged and transmission error rate is reduced; video viewing effects are ensured; transmission cost is quite low; and high-quality requirements required for the monitoring are met.

The invention discloses a signal processing method of an interactive three-dimensional video system. The signal processing method comprises the following steps of: firstly, taking multiple virtual viewpoints between each two adjacent reference viewpoints as auxiliary viewpoints, obtaining the residual image of each auxiliary view point, then encoding each color image, each depth image and each residual image by using a three-dimensional video coding module of a server, transmitting each color image, each depth image and each residual image to a user side, decoding each coded image by using a viewpoint decoding module of the user side, finally generating reference viewpoint signals and auxiliary viewpoint signals by any viewpoint drawing modules, and transmitting the reference viewpoint signals and the auxiliary viewpoint signals to a video display module for display. The signal processing method has the advantages that as the server only needs to transmit the residual images containing less information content as the auxiliary viewpoint information, the coding complexity of the system server is reduced, and as virtual viewpoint signals can be generated at the server only through simple three-dimensional mapping and add operation, the requirements on user side systems are reduced, thus the complexity of the interactive three-dimensional video system is reduced.