57 results about "MPEG-1" patented technology

Original-quality MPEG coded video is processed to produce reduced-quality MPEG coded video for trick mode operation by removing non-zero AC DCT coefficients from the 8×8 blocks of I-frames of the MPEG coded video to produce I-frames of reduced-quality MPEG coded video, and inserting freeze frames in the reduced-quality MPEG coded video. Preferably, the coded video is stored in a main file, a fast-forward file and a fast-reverse file. The fast forward file and the fast reverse files contain reduced-quality I frames corresponding to original-quality I frames in the main file. A reading of the main file produces an MPEG transport stream for an audio-visual presentation at a normal rate, a reading of the fast-forward file produces an MPEG transport stream of the audio-visual presentation in a forward direction at a fast rate, and a reading of the fast-reverse file produces an MPEG transport stream of the audio-visual presentation in a reverse direction at a fast rate. Preferably, the files share a volume that includes at least one GOP index associating the corresponding I frames of the files.

A video compression scheme enables the user to select one of many video compression formats, including the widely-used standard video formats such as MPEG-1, MPEG-2, MPEG-4 and H.263. In one embodiment, the scheme is implemented as a hardware-software combination, with the hardware portion, preferably implemented as an ASIC chip, performing the core compression and the software portion dealing with the detailed formatting. In another embodiment, a 32-bit aligned transitional data format is used.

A method and apparatus of encoding digital video, for example according to the ISO/IEC MPEG standards (ISO/IEC 11172-2 MPEG-1 and ISO/IEC 13818-2 MPEG-2), which employs a local motion estimator for determining respective local motion vectors for groups of adjacent macroblocks in a picture. A local motion vector is determined for each row of macroblocks in a picture from the motion vectors of the macroblocks in that row. Then, for macroblocks in the corresponding row of a subsequently coded picture, the local motion vector can be used to select the search window used for determining the motion vectors. The local motion estimator improves search range and accuracy of macroblock motion vector detection without increasing the search window accessing bandwidth and caching requirement, and computation lode of searching.

A method and apparatus of encoding digital video according to the ISO/IEC MPEG standards (ISO/IEC 11172-2 MPEG-1 and ISO/IEC 13818-2 MPEG-2) using an adaptive motion estimator. A plurality of global motion vectors are derived from the motion vectors of a previous picture in a sequence, and the global motion vectors are analyzed to determine motion characteristics. The video encoding is arranged to enable switching among different types of local motion estimators based on the motion characteristics of the moving pictures sequence. This gives rise to a motion estimation algorithm that can adaptively change its search range, search area and block matching scheme to suit different types of moving sequences.

A scaleable macro block rate control method particularly well-suited for MPEG video. There is provided a method to easily derive a quantization parameter (QP) value using information such as bit usage, previous QP values and SAD values from the past encoded and future frames. The method utilizes quantization estimation techniques based on statistical relationships between different intensity measures, such as distortion intensity, absolute difference intensity and mean of absolute difference intensity. The method is well-suited to applications utilizing MPEG video such as MPEG-1, MPEG-2, MPEG-4, JVT/H.264 standards and so forth.

The invention is a digital television broadcasting system based on MPEG-1, the system is made up of network, digital television broadcasting system based on MPEG-1 through the network and digital television broadcasting receiving system based on MPEG-1. The transmitting system includes MPEG-1 coder, disturber, IP data flow complex device and modulator, the receiving system includes resonance device, demodulator, TS data flow demultiplexing device, and MPEG-1 decoder. The cost is low, and it can display program source with MPEG-1 format with IP mode.

Consumer friendly compact disc which employ MPEG 1 video data for DVD players, computers, and CD-DA tracks for Compact Disc players with traditional playback identified by these independent machines. DVD playable MPEG 1 video time will not alter CD audio playability in CD players due to a 4-second track 1 Table of Contents time. Playback of disc in DVD players allows Play Back Control (PBC) of MPEG 1 data without interaction of CD-DA tracks. The method employed ensure a compact disc free from digital E32 type sector errors associated with PRE GAP and untrue lead out point now true with current white book 2.0 spec when including CD-DA tracks. This specially authored formatted disc derived from a previous unperfected white book spec allow the bridging of three of the most popular consumer products of our time, the DVD player, CD player and the home computer.

An MPEG-1 layer 3 audio encoder, including a scalefactor generator for determining first scalefactors for encoding a block of audio data if a temporal masking transient is not detected in said block of audio data; and for selecting the maximum of said scalefactors for encoding said block of audio data it a temporal masking transient is detected in said block of audio data to enable greater compression of said audio data. Increases in quantization error, due to use of the maximum scalefactor are pre-masked or post-masked by the temporal masking transient. In cases where the last portion of a block includes a temporal masking transient that masks the preceding portions of the block, the maximum scalefactor is only used to encode the block if the resulting increase in quantization error is less than 30% of the quantization error for the block.

The invention discloses a PEG (Polyethylene Glycol)/mPEG (Methoxy Polyethylene Glycol) chemical modifier and a method thereof for preparing a water-soluble resveratrol prodrug. In the PEG/mPEG chemical modifier, PEG or mPEG is used as a vector, and the chemical modifier is prepared through reacting succinic anhydride, bromoacetate or isobutyl bromoacetate with amino acid. The preparation conditions and steps of the chemical modifier are simple. The chemical modifier is used for modifying the resveratrol to prepare the resveratrol prodrug, can change the water solubility and the stability of the resveratrol, is convenient to use and improves the bioactivity. When the prodrug is decomposed in vivo, amino acid required by the human body is also released while the resveratrol is released, thus the application scope of the prodrug is wider than that of the resveratrol.

An audio/visual surveillance system for use in mobile vehicles such as patrol cars includes two video cameras producing video signals and four audio sources producing audio signals. The signals are MPEG-2 compressed and streamed in real time with geographic and time data to a digital cartridge-type tape recorder located in the vehicle. A full patrol car shift is recorded on a single tape and, at the end of the shift, the tape is placed in a master sled bay. An MD5 hash authenticates the data for court use. Up to four videos can be synchronized frame-by-frame for simultaneous monitoring. An MPEG-1 stream is sent via wireless to headquarters in real time. One camera captures data external to the vehicle, while the other captures data internal to the vehicle. One audio source captures audio inside the vehicle and another captures dispatcher communications. The other two audio sources are carried by officers.

The invention discloses an MPEG multi-format compatible decoding method based on software and hardware coprocessing and a device thereof. The device comprises a processor and a hardware accelerator, wherein a register configuration interface between the processor and the accelerator supports the MPEG-1/2/4 standard. The hardware accelerator comprises a sub-pixel interpolation module, a discrete cosine inverse transformation module, a motion compensation module and a DMA controller module, wherein the sub-pixel interpolation module is used for carrying out sub-pixel interpolation operation to read-in reference macro block data; the discrete cosine inverse transformation module is used for carrying out two-dimensional discrete cosine inverse transformation treatment on residual data; the motion compensation module is used for reconstructing a decoding macro block by a sub-pixel interpolation operation result and treated residual data; and the DMA controller module is used for calculating the reference block data reading position, reading the reference block data from a reference frame and writing the reconstructed macro block into the corresponding position address of a reconstructed frame. The invention realizes MPEG multi-format compatible decoding.

A method for generating a block-based image histogram from data compressed by JPEG, MPEG-1, and MPEG-2, or uncompressed image data employing block-based linear quantization to generate histograms that include color, brightness, and edge components. The edge histogram, in particular, includes the global edge features, semi-global edge features, and local edge features. The global edge histogram is based on image blocks of the entire image space. The local edge histogram is based on a group of edge blocks. The semi-global edge histogram is based on the horizontally and the vertically grouped image blocks. A method for generating block-based image histogram with color information and brightness information of image data in accordance with an embodiment of the present invention extracts feature information of an image in terms of the block and updates global histogram bins on the basis of the feature information. The method for generating block-based image histogram with color information and brightness information of image data minimizes quantization error by employing linear weight and updates values of histogram bins. The error that occurs at a boundary between bins of the histograms and the linear weight depends on the distance between the histogram bins.

A boundary macroblock of a video object is padded without significant synchronization overhead between a host processor and an existing coprocessor. The host processor determines horizontal and vertical graphics primitives as a function of shape data stored in a host memory. The shape data determine whether a dot, a line, or a rectangle primitive should be used to pad transparent pixels in the macroblock. The host processor communicates the primitives to a coprocessor, which renders the primitives in an interleaved pipeline fashion to pad transparent pixels of the macroblock based on texture data stored in video memory. The flow of primitives is in one direction from the host processor to the graphics coprocessor, and the texture data is not transferred back and forth between the host processor and coprocessor. This technique is especially useful for enabling acceleration of MPEG-4 video decoding utilizing existing coprocessors capable of accelerating MPEG-1/2 video decoding.

A decoder particularly, but not exclusively, for MPEG-1 layer III data signals, in which recovered spectral coefficients are transformed into time domain signal components, the time domain signal components then being transformed, using a forward transform which is orthogonally modulated with respect to the forward transform that was used at the encoder, to produce a set of second spectral coefficients. In this way, the first and second spectral coefficients may be used as complex-valued spectral coefficients which are amenable to post-processing. In the preferred embodiment, the complex-valued frequency components are, after post-processing, transformed to the time domain using an odd-frequency modulated Discrete Fourier Transform (DFT).

A process for reducing data movement and thereby reducing the power consumption and reducing cycle requirements for video compression techniques is described. A process for improving data acquisition process for motion estimation when transitioning from one macroblock to next adjacent macroblock by selective replacement of motion estimation area is described. One process involves replacing a non-overlapped search area in one (left) region

belonging to one macroblock with the new search area in another (right) region belonging to the next adjacent macroblock. Another method involves replacing a non-overlapped search area in one (left) region with the new search area in another (right) region employing a cyclic memory structure. A third method in using the overlapped search areas for vertically adjacent regions is described. The processes involve improvements to MPEG-1, H.261, MPEG-2/H.262, MPEG-4, H.263, H.264/AVC, VP8, and VC-1 video coding standards and any other video compression technique employing a motion estimation technique.