37 results about "Average distortion" patented technology

A method and apparatus for temporally allocating bits between frames in a coding system such that temporal fluctuations are smoothed out. Namely, a picture quality is monitored on a frame by frame basis. An average distortion measure is derived from previous picture frames and that average is compared to the distortion measure of a current frame, where the result is used to effect bit budget allocation for each frame in an input image sequence.

The invention discloses direct mode selection based H.264 / AVC (Advanced Video Coding) fast transcoding method and device, which mainly overcomes the defects of high operation complexity, poor real-time performance and high occupancy rate on operation / storage and other resources in the prior art. The transcoding device comprises a decoder, a macroblock distortion estimation module, a macroblock mode selection module and a coder, wherein the decoder decodes a compressed code stream to obtain a macroblock mode, movement information, a residual and a decoding frame image; the macroblock distortion estimation module and the macroblock mode selection module perform macroblock distortion estimation and fast mode selection according to the decoding information and the reference frames of the coder and the decoder; and the coder performs RDO (Remote Data Objects) judgment to the I frame of the current GOP (Group of Pictures) and the first P frame, and counts the average distortion of the firstP frame in all optimal interframe mode as a threshold for the fast mode selection, otherwise, the fast coding is carried out on the decoding frame image to obtain the H.264 / AVC compressed code streamwith a set target code rate. The invention greatly reduces the operation complexity of transcoding and decreases the time on transcoding, and can be applied to the real-time multimedia transmission and other data transmissions.

The invention relates to a method for automatically identifying an optimal K value of elbow rules and belongs to the technical field of unsupervised clustering learning in machine learning. The methodcomprises steps that the to-be-searched optimal K value range [1, M] of the K-means clustering algorithm is set; the average distortion degree corresponding to the set range cluster number is calculated; 0-10 regularized conversion of the average distortion degree acquired through calculation is carried out; the average distortion degree after 0-10 regularized conversion and the range [1,M] are encapsulated into data pairs; the Cosine's theorem is utilized to solve angles among consecutive three encapsulated data pairs; the minimum angle is acquired; the minimum angle is utilized to acquire the optimal K value. The method is advantaged in that on the basis of K-means algorithm and the elbow rules, through 0-10 regularized conversion of the average distortion degree acquired through the elbow rules and further calculation carried out through utilizing the Cosine's theorem, the optimal K value in the designated range is lastly acquired.

A method and apparatus for controlling a channel for providing an IPTV is disclosed, which is capable of improving use efficiency of network resource and reducing a channel zapping time by controlling a channel type of each channel and a bit rate of video data to be transmitted through each channel, the method comprising (a) determining an optimal channel status vector among channel status vectors to indicate channel types of respective channels, wherein the optimal channel status vector enables a minimum cost corresponding to the sum of an average channel zapping time of respective channels and an average distortion value of video data transmitted through the respective channels; and determining an optimal bit rate at the determined optimal channel status vector; and (b) transmitting the video data at the optimal bit rate through the respective channels.

A method and apparatus for controlling a channel for providing an IPTV is disclosed, which is capable of improving use efficiency of network resource and reducing a channel zapping time by controlling a channel type of each channel and a bit rate of video data to be transmitted through each channel, the method comprising (a) determining an optimal channel status vector among channel status vectors to indicate channel types of respective channels, wherein the optimal channel status vector enables a minimum cost corresponding to the sum of an average channel zapping time of respective channels and an average distortion value of video data transmitted through the respective channels; and determining an optimal bit rate at the determined optimal channel status vector; and (b) transmitting the video data at the optimal bit rate through the respective channels.

The invention provides a method and a device for evaluating video sequence distortion. The method for evaluating the video sequence distortion includes: as for distortion of each local region in each frame of a video sequence, obtaining a distortion sensitivity factor corresponding to the distortion by the aid of a texture intensity factor, a fixation point factor, a movement intensity factor and a distortion area factor at the position of the distortion, and taking a sum of products of the distortion of all local regions in each frame and the corresponding distortion sensitivity factors of the distortion as a distortion sum of the frame; as for each frame in the video sequence, obtaining a distortion sum corrected value of the frame according to a distortion sum of one of a plurality of frames adjacent to the frame; and obtaining a time domain weight number of the frame according to a corresponding moment of the frame in the video sequence, calculating a sum of products of distortion sum corrected values of all the frames and time domain weight numbers corresponding to the frames, and dividing a normalized numerical value so that average distortion of the video sequence is obtained. The average distortion of the video sequence obtained by the method is highly consistent with a subjective video quality evaluation result.

The geometric distortions of videos and images are corrected wherein a plurality of geometrically distorted frames are mapped with a plurality of original frames of the video content. Further, one or more features associated with the mapped frames are identified as insensitive to the one or more geometric distortions. One or more features of the mapped frames are further mapped with original frames based on a predefined similarity threshold and thereafter one or more geometric distortion parameters are determined. Furthermore, a frame level average distortion and a video level average distortion of each of the one or more geometric distortion parameters are determined, based on which the one or more geometric distortions of the video content are corrected.

This invention relates to multicast rate optimization, particularly a method for controlling an encoder (1) in a communications system (3) including a plurality of receivers (2). The method includes partitioning the receivers (2) into at least one cell, and associating each cell with a specific rate that may be used to transmit signals to a receiver (2). According to the inventive method, uncertainties in estimates of conditions of the communications system (3) are taken into account by modelling the conditions, such as the average distortion perceived by the receivers (2), as the outcome of a stochastic variable, thereby accounting for uncertainties in the estimates of the conditions of the communications system (3). The invention also relates to an encoder associated with the method.

The invention discloses a method for correcting signal distortion. The method consists of the steps of: scanning a bar-space equal-width test barcode and using the scanned width value of each bar-space acquired by scanning the test barcode as a distortion width value; acquiring the average distortion width value of the bar-spaces of the test barcode according to the distortion width value of each bar-space of the test barcode; using the average distortion width value as the reference value to acquire the deviation value of the distortion width value and the average distortion width value and correcting the acquired scanning width value of the scanned barcode according to the deviation value. The invention also discloses a laser barcode scanning platform. By means of this invention, the distortion of the barcode signal transformed from a barcode width value is corrected, the code reading performance of the laser barcode scanning platform is enhanced, and it is not necessary to write control programs for the laser heads of each laser barcode scanning platform equipment; in the meantime, the requirements for laser head precision and manufacturing technique are lowered, and the production cost of laser barcode scanning platform is lowered.

The present invention provides a flexible copper-clad laminate having a folding resistance property, capable of preventing a wire circuit from being disconnected or cracked in a narrow housing. The flexible copper-clad laminate according to the present invention is a flexible copper-clad laminate, in which a copper plate (B) having a thickness of 8-20 μm, a tensile modulus of 10-20 Gpa, and having an average crystalline particle diameter of at least 10 μm in a section taken in a thickness direction is provided at least one surface of a polyimide layer (A) having a thickness of 10-25 μm and a tensile modulus of 4-10 Gpa, folded and received in a housing of an electronic device. A folding coefficient calculated through following Equation (I) is in the range of 0.96±0.02 in a bending test in which a gap of a predetermined flexible substrate having a copper wire formed by machining the copper plate of the flexible copper-clad laminate is 0.3 mm. Equation 1 is expressed as [PF]=(¦ε¦-ε_c) / ¦ε¦ , wherein ¦ε¦ is an absolute value of an average distortion value of the bent copper wire, and ε_c represents the distortion of the tensile elastic limit of the copper wire.

The invention discloses a panoramic video objective quality evaluation method based on space-time pipeline modeling, and the method comprises the steps: firstly adding a concept of time domain distortion according to a human eye visual mechanism, and building a video quality evaluation model based on a space-time pipeline; secondly, realizing the establishment of a space-time pipeline by a block search algorithm for motion estimation, the video content segmented spatially being associated front and back in time; the distortion of the space-time pipeline being decomposed into average distortionand time domain distortion, the average distortion being used for reasonably averaging the space distortion of blocks in the space-time pipeline through a recursive filter, and the recursive filter being used for consolidating the space-time pipeline distortion calculation by combining the frequency and amplitude of the distortion change gradient between the blocks; and finally, performing spatial domain pooling and time domain pooling calculation on all spatial-temporal pipeline distortions to obtain a final video quality score. By adopting the method provided by the invention, the accuracyof panoramic video objective quality evaluation can be greatly improved, so that the panoramic video objective quality evaluation better conforms to the subjective quality evaluation result of human eyes.

The invention relates to a method for calculating the lattice distortion of high-entropy alloys based on the ordering behavior of atomic occupancy, comprising the following steps: step S1: constructing a corresponding thermodynamic model; step S2: calculating each end group compound and The discrete value of the Gibbs free energy thermodynamic data of elemental elements; Step S3: build the thermodynamic database of high-entropy alloy end group compounds; The occupancy fraction on the lattice; Step S5: construct the structural model of the actual distribution of atoms in the high-entropy alloy; Step S6: obtain the structural model after the structure optimization; Step S7: according to the structural model after the structural optimization, substitute the preset crystal The lattice distortion formula is used to calculate the total distortion, average distortion and relative lattice distortion of the high-entropy alloy. The invention realizes the quantitative calculation of the lattice distortion effect of the high-entropy alloy.

The invention provides a transcoding method from H.264 / SVC(scalable video coding) to H.264 / AVC(advanced video coding) based on a video on demand system of P2PVoD, belonging to the field of video transcoding. With the adoption of SVC self-adapting transcoding, an SVC document is divided into independent multi-layer documents according to layers by a separator, before transcoding, a space layer and a quality layer are subjected to a self-adaption process according to the terminal ability, layers not needed are abandoned to enable the transcoding process to effectively reduce unnecessary time consumption, and the video quality matching with the ability of a client end is provided for the client end; with the adoption of a method combining a pixel region and an alternation region, time complexity is lowered, and error shift is effectively controlled; with the adoption of an encoding control optimized algorithm based on Lagrangian, when an average distortion function is being solved, a sum of absolute difference (SAD) is used for substituting a sum of squared difference (SSD), and the calculation complexity is simplified; and with the adoption of a processing mechanism by parallel threads based on GOP (group of pictures), the single-encoded GOP is processed by parallel threads, and thus the transcoding time is greatly reduced.

The invention provides a target equivalent rotation center estimation method for a double-base ISAR and relates to the field of radar signal processing technology. According to echoes received by a double-base radar, a one-dimensional distance image sequence is generated. Through grouping, a first image and a second image are generated and the observation view angle difference of the first image and the second image is calculated. According to a distortion angle calculating formula, a first average distortion angle and a second average distortion angle are calculated. According to the averagedistortion angles, the first image and the second image are corrected and are recorded as a first corrected image and a second corrected image. Further, according to the second corrected image and a rotation conversion formula, a rotation image is generated. Finally, according to the first corrected image and the rotation image, the correlation index of the first corrected image and the rotation image is calculated and the equivalent rotation center is determined. By adopting the technical scheme provided by the invention, the estimation precision of the equivalent rotation center is improved;through introduction of the average distortion angles, the application range of equivalent rotation center estimation is improved.