39 results about "Spatial quality" patented technology

The present invention relates to a method and corresponding system for predicting the perceived spatial quality of sound processing and reproducing equipment. According to the invention a device to be tested, a so-called device under test (DUT), is subjected to one or more test signals and the response of the device under test is provided to one or more means for deriving metrics, i.e. a higher-level representation of the raw data obtained from the device under test. The derived one or more metrics is/are provided to suitable predictor means that “translates” the objective measure provided by the one or more metrics to a predicted perceived spatial quality. To this end said predictor means is calibrated using listening tests carried out on real listeners. By means of the invention there is thus provided an “instrument” that can replace expensive and time consuming listening tests for instance during development of various audio processing or reproduction systems or methods.

The present invention relates to a method and corresponding system for predicting the perceived spatial quality of sound processing and reproducing equipment. According to the invention a device to be tested, a so-called device under test (DUT), is subjected to one or more test signals and the response of the device under test is provided to one or more means for deriving metrics, i.e. a higher-level representation of the raw data obtained from the device under test. The derived one or more metrics is/are provided to suitable predictor means that “translates” the objective measure provided by the one or more metrics to a predicted perceived spatial quality. To this end said predictor means is calibrated using listening tests carried out on real listeners. By means of the invention there is thus provided an “instrument” that can replace expensive and time consuming listening tests for instance during development of various audio processing or reproduction systems or methods.

Providing flexible management of heterogeneous memory systems using spatial Quality of Service (QoS) tagging in processor-based systems is disclosed. In one aspect, a heterogeneous memory system of a processor-based system includes a first memory and a second memory. The heterogeneous memory system is divided into a plurality of memory regions, each associated with a QoS identifier (QoSID), which may be set and updated by software. A memory controller of the heterogeneous memory system provides a QoS policy table, which operates to associate each QoSID with a QoS policy state, and which also may be software-configurable. Upon receiving a memory access request including a memory address of a memory region, the memory controller identifies a software-configurable QoSID associated with the memory address, and associates the QoSID with a QoS policy state using the QoS policy table. The memory controller then applies the QoS policy state to perform the memory access operation.

The invention describes a method of single-transverse-mode generation for waveguide lasers of various kinds having a large cross section of their active core and thus providing a possibility of efficient pump of the active core region. This results in a laser beam with enhanced power and high spatial quality for high efficiency coupling to standard single-mode optical fiber networks. It is found that a multimode waveguide having a central dip of special shape in the refractive index profile of its core is able to guide a higher order mode with sharp central peak of its field carrying the considerable part on the mode energy and whose width is well compatible with the width of the fundamental mode of standard single-mode fibers. The useful properties of this higher order mode can be employed to provide the single-transverse-mode regime of generation in optical fiber lasers, integrated optical micro-lasers and various semiconductor laser sources.

Picture level rate control systems, apparatuses and methods are described which indirectly control bit rate through peak signal to noise ratio (PSNR), thereby providing a stable PSNR while maintaining a given target average bit rate. In a preferred implementation, encoding is performed in conjunction with macroblock QP modulation. In this way, the picture level rate control provides stable temporal quality and the macroblock QP modulation provides stable spatial quality. By way of example, the number of bits generated in a group of pictures (GOP) is controlled by modulating the target bit allocation for a group of pictures (GOP) based on coded picture buffer (CPB) fullness. Macroblocks are encoded for each picture based on a rate-distortion model, which is modified in response to the relative fluctuation of PSNR of pictures within a group of pictures.

Aspects of the present invention are related to systems, methods and apparatus for automatic quality assessment of a video sequence. According to a first aspect of the present invention, a quality index may be generated by combining a spatial quality index and a temporal quality index. According to a second aspect of the present invention, a spatial quality index may be calculated using a modified exponential moving average model to pool multi-scale structural similarity indices computed from test frame—reference frame pairs. According to a third aspect of the present invention, a temporal quality index may be generated by averaging multi-scale structural similarity indices computed from difference image pairs, wherein one difference image is formed between reference frames and another difference image is formed between a reference frame and a test frame.

A method and apparatus for spatial Quality of Service (QoS) in a wireless network include determining a relative or absolute location of target devices receiving or requesting a same media stream; determining a group of the target devices within a given proximity of one another utilizing resources from the same wireless access network; for each target device in the group while the resources remain in the wireless network: determining a target device based on relative spatial distance to other target devices in the group with prioritized reception of the media stream; and granting the determined target device prioritized reception of the media stream.

The present invention discloses a city spatial quality evaluation method based on big data, which tries to employ data mining to acquire relevant network-based evaluation data. According to the present invention, data mining, address paring, weight calculation are performed for typical public service facilities, spatial quality evaluation application is explored based on dimension reduction of big data. The empirical part comprises three aspects: in an objective evaluation aspect, performing spatial evaluation for distribution density and per capita possession of the public service facilities by means of data mining and address parsing; in a subjective evaluation aspect, by collecting network evaluation-based focusing degree and satisfaction degree data, performing a location analysis on the quality public service facilities; and based on the above, performing a weight calculation for the object/subjective evaluation of the public service facilities, to conclude a comprehensive assessment on the spatial quality. The method according to the present invention not only addresses the problem of evaluation of the city spatial quality in the aspect of structure, but also practically reflects the satisfaction degree and feeling of the micro individuals, thereby implementing quality measurement of the city space.

The invention provides a face living body detection method and device. The method comprises the following steps that: collecting a face image, and preprocessing the face image; extracting the BRISQUE(Blind/Referenceless Image Spatial Quality Evaluator) feature of the no-reference image quality assessment in the spatial domain of a preprocessed face image; inputting the BRISQUE feature of the no-reference image quality assessment in the spatial domain into a classifier for classification; and according to a classification result, judging whether the face image is from a living body or not. Theface living body detection method does not need to be cooperated with the movement and the action of a user, and a user experience degree is good. In addition, a photo and an image collected by a video are subjected to secondary imaging to exhibit distortion, including noise, reflection and the like, so that the living body face image, the photo image, the living body face image and the video image have differences on an aspect of image gray level statistics, the differences are used for extracting the BRISQUE features based on gray level statistics for identification, and the accuracy and the robustness of living body detection are enhanced.

The invention provides a panoramic video transmission method, a transmission device and a transmission system, wherein the panoramic video transmission method is applied to a client and comprises thesteps of acquiring a media file from a server end and analyzing the file, and downloading video segments according to the media file; in a loading process, acquiring head position information of a user, and predicating viewing probability of the video segments according to the head position information; calculating the size of a video playing buffering area, and calculating a total code rate upperlimit of the video segments according to the estimated network bandwidth and the size of the video playing buffering area; calculating the spatial quality change of the video segments and the expected distortion of the video segments, establishing a QoE model according to the spatial quality change and the expected distortion of the video fragments, and selecting the to-be-downloaded video fragments. The panoramic video transmission method, the transmission device and the transmission system realize technical effects of reducing data volume in panoramic video transmission, improving video quality, reducing spatial quality fluctuation and lags in video playing.

The invention discloses a multi-channel audio quality evaluation method based on two layers of models, and belongs to the technical field of multi-channel audio quality evaluation. The method comprises the following steps: firstly, processing to-be-tested audio frequency and reference audio frequency by virtue of two objective models, namely an objective basic sound quality model and an objective spatial quality model, which are obtained by implementing training in accordance with a subjective listening test result, in the first layer, so as to calculate out objective basic sound quality scores and spatial quality scores; and then, inputting the scores, as independent variables, into an overall objective model which is obtained by implementing training in accordance with the subjective listening test result, so as to finally obtain overall objective scores of the to-be-tested audio frequency; therefore, evaluation of multi-channel audio quality is achieved. The method provided by the invention, in comparison with original single-layer models, is not only conducive to testers to understand quality information of the to-be-tested audio frequency in more detail but also better in accuracy.

The present invention relates to a free viewpoint image quality evaluation method based on ray space. The invention uses the edge pixel direction consistency parameter of lines which have same direction in ray space for elevating the ray space quality obtained by three different interpolation methods. Firstly the high-frequency energy diagrams of all pixel direction angles in the ray space are obtained from three interpolation methods. Simultaneously the edge graph of ray space, which has low noise and same direction, is obtained. Then the average high frequency energy value of pixel direction angle in the edge graph is calculated, and the value is used as an important criterion which is used for evaluating the consistency of ray space edge pixel direction obtained through interpolation. Finally whether the evaluated high-quality ray space can generate high-quality viewpoint picture is checked. The test shows that when the ray space obtained through fixed-direction interpolation, ray space obtained through bilinear interpolation and ray space obtained through most adjacent interpolation are executed with quality evaluation, the obtained parameter variation is more uniform and is more adjacent with the variation characteristic of PSNR evaluation result compared with the prior art.

The purpose of an objective video quality evaluation is to automatically assess the quality of video sequences in agreement with human quality perception. The invention addresses the effects of the introduction of a temporal dimension by focusing on the temporal evolutions of spatial distortions, since it has been found that a spatial quality variation cannot be evaluated by simple subtraction of the spatial quality of neighbouring frames. An improved method for estimating perceived video quality comprises steps of calculating a first similarity map between adjacent frames of a current sequence, calculating a second similarity map between the corresponding reference frames, and calculating (smg3) a third similarity map, which provides a numerical quality value.

The side-pumped solid-state laser source comprises a resonant cavity defined by at least two spaced-apart mirrors, an active medium of laser crystal type placed in said resonant cavity, and a pumping source, the layout of the resonant cavity, defined by the crystal and by the mirrors, being arranged to cause spatial inversion of the oscillating mode within the active medium in the absorption direction of the pumping beam, such as to symmetrize the thermal focal length seen by the oscillating mode. The laser source comprises lenses for conditioning the pumping beam emitted by the pumping source, to form on the side face of the laser crystal a pumping spot arranged to symmetrize the spatial quality of the emitted laser beam and/or active control means for the laser crystal temperature, in order to correct its undesired astigmatic effects. The pumping process for the solid-state laser source generates on the side face of the laser crystal a pumping spot arranged to symmetrize the spatial quality of the emitted laser beam, in such a manner as to correct its undesired astigmatism effects.

The invention relates to a hill and mountainous region water resource development and utilization scheme capable of achieving water storage, irrigation (flood regulation) and power generation. The hill and mountainous region water resource development and utilization scheme comprises a floor drain system, a water storage system, an irrigation (flood regulation) system, a water pipelines, dam sluices, a power generation system, a power cable, a communication cable and a master control system. The hill and mountainous region water resource development and utilization scheme has the advantages that the scheme is based on a hill and mountainous region, water is stored in a hill, land occupation is avoided, water resources are efficiently developed and utilized, the scheme has no special requirements on water resource constitution, and corresponding design, construction, regulation and control and maintenance are adopted according to the latitude, geology, terrain, landform, rainfall, waterstorage quantity of the specific hill and mountainous region; the water resources are developed and utilized in terms of space, time, irrigation (flood regulation), water use structure, water supplystructure, power generation and the like, the reserve of underground water resources is increased favorably, reasonable water-resource spatial and temporal distribution is benefited, water pollution treatment level is increased, the water resources can be protected favorably, and the spatial quality of people's life is increased.

The laser apparatus for generating high energy pulses of short duration comprises a pumping laser source and a miniaturized cavity defined by a pair of mirrors in which an active crystal and an absorber are housed. The active crystal presents a gain greater than 10 dB in double pass, said absorber being a saturable absorber. The process for generating a laser pulse consists of generating a beam of modes within a cavity and amplifying only one of the modes, so that the resultant signal presents a very limited duration but a very high intensity, with a spatial quality close to the diffraction limit.

The invention provides a comprehensive evaluation system and an evaluation method for urban spatial quality, which can be used for the evaluation of spatial quality in urban planning and design, architectural design and real estate development specialties. The evaluation system determines the core value of contemporary urban space through relevant theoretical research, and creatively establishes acomprehensive evaluation system and method of spatial quality according to Goffman's face-to-face communication theory model. The evaluation system comprises three main indexes: space capacity, accessibility, and the catalytic effect of space on user's face-to-face communication behavior, and comprises a plurality of sub-indexes and categories. An evaluation index is established for each system end attribute, and the comprehensive overall evaluation of the designated urban spatial quality is finally obtained through the calculation method layer by layer. The present invention also provides amethod for visualizing an evaluation result. This evaluation system can comprehensively reflect the quality characteristics of contemporary urban built-up environment space and guide the practical development of related fields.