86results about "Digital video signal modification" patented technology

A method and apparatus for adaptively selecting a context model for entropy coding and a video decoder are provided. A method of coding a residual prediction flag indicating whether residual data for an enhancement layer block of a multi-layered video signal is predicted from residual data for a lower layer block corresponding to the residual data for the enhancement layer block includes the steps of calculating the energy of the residual data for the lower layer block, determining a coding method for the residual prediction flag according to the energy, and coding the residual prediction flag using the determined coding method.

The invention discloses a hybrid image compressing method based on block classification. In the invention, blocks are divided into text/ image block, natural image block and hybrid block according to different features of text/image area and natural image area of original images in the aspect of color and texture; then a compression mode in which palette coding, Hextile coding and LZW coding are combined is used in the text/ image block, a JPEG lossy compression mode is used in the natural image while the algorithm of the combination of the two modes is used in the hybrid block. The invention has the advantages that based on the block classification method, the text/image area and the natural image area can be divided up accurately, and that the blocks are respectively encoded can keep rather acuminate edge of the text/image block so as to enhance visual effect on the basis of ensuring higher compression efficiency and upgrade the peak signal to noise ratio of reconstructed images; the complexity of the algorithm is lower.

A plurality of motion vector candidates is extracted, which includes motion vectors of a first set of blocks and a second set of blocks each adjacent to an object block. The first set of blocks has the same size as the object block. The second set of blocks has a smaller size than the object block. A first predicted motion vector of the object block is selected from the plurality of motion vector candidates. A residual cost of each neighboring motion vector is calculated. Each neighboring motion vector points a point within a predetermined range from a point pointed by the first predicted motion vector. A second predicted motion vector having the minimum residual cost is selected from the plurality of neighboring motion vectors. If the first predicted motion vector is equal to the second predicted motion vector, the first predicted motion vector is set as the motion vector of the object block. If the first predicted motion vector is not equal to the second predicted motion vector, a search region pointed by the first predicted motion vector is searched by block matching.

The subject matter herein generally relates to transcoding content, typically audio/video files though not limited to such, from one version to another in preparation for online streaming or other delivery to end users. Such transcoding may involve converting from one format to another (e.g., changing codecs or container formats), or creating multiple versions of an original source file in different bitrates, frame-sizes, or otherwise, to support distribution to a wide array of devices and to utilize performance-enhancing technologies like adaptive bitrate streaming. A transcoding platform is described herein that, in certain embodiments, leverages distributed computing techniques to transcode content in parallel across a platform of machines that are preferably idle or low-utilization resources of a content delivery network. The transcoding system also utilizes, in certain embodiments, improved techniques for segmenting the original source file so as to enable different segments to be sent to different machines for parallel transcodes.

Systems and methods for scalable video coding using special inter-layer prediction modes (called telescopic modes) are provided. These modes facilitate accelerated operation of encoders with improved coding efficiency.

A method and apparatus for removing false contours while preserving edges. In the method, a false contour area is detected from an input image, false contour direction information and false contour location information of the false contour area are generated, the false contour area is expanded, and a false contour is removed from the expanded false contour area.

A method provides for encoding a frame of video using an edge map made up of one or more edge-blocks detected in the frame. When the edge-blocks are contiguous, at least one slice partition is formed using the edge-blocks and the slice partition is encoded using a sample adaptive offset (SAO) filter, wherein the slice partition is formed with an adaptive slice width, and the sample adaptive offset (SAO) filter is turned on or off during the encoding based on whether the edge-blocks are being encoded. When the edge-blocks are not contiguous, edge-block processing is performed around edges in the frame during encoding of the edge-blocks. The edge-block processing involves configuring one or more of: an intra block size, a transform block size, an inter prediction block size, a quantization parameter, candidate modes for intra prediction, pyramid level for motion estimation, and fractional pixel motion estimation search.

In general, techniques are described for performing an intra block copying process to code video data. A video decoding device that includes a memory and one or more processors may perform the techniques. The memory may be configured to store a current block of a picture. The processors may be configured to perform an intra block copying process to decode the current block using a prediction block that is from a same slice or a same tile as that in which the coded current block resides, the prediction block restricted to be within a search region that only includes the same slice or the same tile as that in which the coded current block resides.

The invention discloses an image compression encoding and decoding devices without visual loss, and encoding and decoding methods. The encoding method involves, first of all, dividing each row of an image into a plurality of micro-blocks, analyzing the micro-blocks, and determining the types of the macro-blocks; performing graphic encoding on graphic-type micro-blocks, performing intraframe mode prediction on non-graphic-type micro-blocks, and solving residual errors between current macro-blocks and predicted macro-blocks; analyzing the residual errors, and performing wavelet transformation on the residual errors needing wavelet lifting to obtain transformation coefficients; then according to image content, adaptively performing code rate control, and forming bit surface encoding on the input residual errors or the transformation coefficients to obtain final code rates; and finally, through combination with the predicted macro-blocks, reconstructing the macro-blocks. According to the invention, the purpose of high-quality and high-speed transmission of a single row of the image at a constant code rate is achieved, the image after compaction and an original image are free from the visual loss, the complexity is quite low, and fewer resources are occupied.

A method for calculating a direct mode motion vector for a bi-directionally predictive-picture includes: calculating S based on TRB, TRD, and N; calculating Tx based on MVx, the S, and the N; calculating Ty based on MVy, the S, and the N; obtaining a sum of the Tx, MVDx and δ1x, and using the obtained sum as MVFx; obtaining a sum of the Ty, MVDy and δ1y, and using the obtained sum as MVFy; obtaining a sum of the MVFx, δ2x, and a minus value of the MVx, and using the obtained sum as MVBx; and, obtaining a sum of the MVFy, δ2y, and minus value of the MVy, and using the obtained sum as MVBy.

A method, medium, and system effectively compressing and/or restoring binary images. By compressing pixel values making up a 2×2 block in an input image, using representative values representing the pixel values and a pattern of the pixel values represented by the representative values, it is possible to effectively compress and/or restore binary images having little similarities between pixel values. In addition, by extracting compressed values and a pattern of pixel values making up a 2×2 block in an image, from compressed data of the 2×2 block, and restoring pixel values using the compressed values and the pattern, it is possible to effectively restore binary images.

The system comprises: server side; at least one client side; and pick-up head connected to the client side. The client side comprises a video collection module, a picture-shooting module; a digital data processing module and a data transmission module. The server side comprises a data transmission module, a data storage module, a data processing module, a video playback module and a picture preview module.

A video encoder comprises a video frame receiver (101) connected to a processor (103) deriving relative frames from the received video frames and predicted frames. The processor is connected to a Discrete Fourier Transform (DCT) processor (105) which again is connected to a quantiser (107) for generating quantised spatial frequency coefficients for the relative frame. The output of the quantiser (107) is fed to a splitter that splits the data subset having low frequency components and a second data subset having frequency components. The first subset is used in the encoding loop comprising an inverse quantiser (111), inverse DCT processor (113), motion compensation processor (115, 117) and predicted frame processor (104). Hence, the encoding loop is simplified by only considering a reduced data set for each frame. A transmitter (119) transmits the video data as a progressively scalable stream for both the first and second data subsets.

A video picture management equipment includes a first display control module and a second display control module which are connected to each other. The first display control module displays first video data on first video window, and second video data on the first video window at the same time according to a requirement; and the second display control module displays the second video data on a second video window, and the first video data on the second video window at the same time according to a requirement. A method for video picture management is also provided. By the above, the problems about the simple display mode and the unstable display effect during performing the PIP in the prior art are solved.

The invention provides a fast selection method and a fast selection device of an inter-frame prediction mode, and electronic equipment. The method comprises the steps of judging whether a current coding unit is a minimal coding unit with preset depth; if no, dividing the current coding unit into four sub-coding units; computing a rate-distortion cost of the current coding unit under a Split mode and a minimal rate-distortion cost of the current coding unit under a to-be-selected undivided mode; and determining the best prediction mode of the current coding unit according to the rate-distortioncost under the Split mode and the minimal rate-distortion cost under the to-be-selected undivided mode. According to the method provided by the invention, the best prediction mode is determined according to the rate-distortion cost under the Split mode and the minimal rate-distortion cost under the to-be-selected undivided mode, good coding quality and high coding rate can be simultaneously effectively achieved, the coding rate can be greatly improved under the premise of ensuring the coding quality, and the problem that the existing method is difficult to simultaneously achieve good coding quality and high coding rate is alleviated.

The invention discloses an H.264 video integrality authentication method which comprises processes of extracting authentication codes, embedding identification information and tamper detecting and positioning. A video sequence is more complex than image information, so that video identification codes can not be extracted simply with the method of image hash value extracting. The invention provides a space energy fluctuation analysis method, according to video frames having different characteristics, an improved hierarchical quantization and vector quantization method is targetedly utilized, and video identification codes can be effectively extracted. In combination with improved H.264 robust watermarking algorithm and H.264 high-capacity information hiding algorithm, an H.264 video integrality authentication system is formed, and researches on tamper detecting and positioning can be conducted.

Disclosed is a demultiplexer for demultiplexing a multiplexed stream, obtained on time division multiplexing a plurality of elementary streams. A buffer controller, forming this demultiplexer, writes a multiplexed stream, beginning from a location specified by a data write pointer of a ring buffer, configured for storing data of the multiplexed stream, in the manner of an endless loop. On receipt of an ES1 readout request, an ES1 readout control unit takes out, from an ES1 readout pointer storage unit, a readout pointer, as a start point of retrieving an area in the ring buffer where the oldest ES1 is stored. The ES1 readout control unit then retrieves and reads out the ES1, with a location specified by the ES1 readout pointer, as a start point, and sends the ES1, thus read out, to the source of the request. The ES1 readout control unit then updates the ES1 readout pointer and the data leading end pointer.

The invention discloses an encrypted embedded video chaotic secret communication method after H.264 coding. The encrypted embedded video chaotic secret communication method comprises the following steps of S1, at a transmitting end, performing H.264 hardware coding, chaotic flow password encryption, pixel-position chaotic scrambling encryption, network transmission and wide-area network transmission on video data; and S2, at a receiving end, receiving encrypted video data through the network, finishing pixel-position chaotic descrambling decryption and chaotic flow cipher decryption, realizing H.264 hardware decoding on the condition that a password matches, and stopping communication between the transmitting end and the receiving end after H.264 hardware decoding failure on the condition that password mismatching occurs. The encrypted embedded video chaotic secret communication method has double encryptions, namely chaotic flow password encryption and chaotic position scrambling encryption. The double encryptions are performed after H.264 coding compression. The encrypted embedded video chaotic secret communication method has advantages of realizing no damage of original video correlation, improving coding efficiency, reducing data redundancy, and realizing high real-time performance and high safety of an encryption system.

Systems, apparatuses and methods for decoding and encoding a video bitstream with a computing device are disclosed. The method for encoding includes receiving, from a decoding computing device, data for encoding the video bitstream; determining encoding parameters based on the data for encoding the video bitstream; determining, by the computing device and for encoding a current frame of the video bitstream, a selected reference frame from reference frames preceding the current frame in display order, the reference frames comprising a good reference frame, wherein the good reference frame is a reference frame known to the encoder to be error-free; and encoding the current frame of the video bitstream using the selected reference frame and the encoding parameters.

The invention is a remote wireless image monitoring system based on DCT domain differential transmission, including a spot image capturing module, a wireless data transmitting module, a data central server software and a remote monitoring terminal software. The spot monitoring terminal detects the image and triggers alarm and transmits the captured image only when the image changes; DCT domain differential image transmission mode is employed during transmitting process. The remote wireless image monitoring system based on DCT domain differential transmission of the invention has advantages that the solution greatly reduces flux of network transmission, thereby remarkably reduces charge of monitored data flux, meanwhile greatly reduces system consumption; modular design and universal industrial standard are employed, which provides a compact system with very low consumption, excellent expandability and strong practicability.

A quick motion value-evaluation method of objects includes the following steps: 1, the motion evaluation of border streak macro-blocks: Taking the position determined by MV3 as the center in a reference frame to search for border streak macro-block motion vector within minus or plus sphere, if BAB corresponding to the macro-block is an in-frame encode mode, then MV3=(0,0), 2, the motion evaluation of opaque macro-block in the object includes the selection of the initial search point, determination of search sphere and judgment to the interrupt of the motion evaluation.