48 results about "Time distortion" patented technology

A panoramic annular lens system (PAL), a unitary video camera and a PC-based software system that unwraps a 360° video image into a seamless, distortion free horizontal image image in real time. The PAL system of the preferred embodiment has a 360° horizontal field of view and a 90° vertical field of view in a 40 mm diameter compact package. The invention is not limited to any particular type of lens system. In fact, there are numerous lens systems for providing a 360° panoramic view. The video camera may be a CCD or CMOS based device having a pixel resolution of either 1280×1024 (high resolution) or 720×480 (NTSC). The unwrapping system is a radiometric ray tracing program carried out using a computer's graphics card capabilities to produce highly efficient regional transformation while minimizing software overhead. The result is real time, high resolution 30 fps conversion from a spherical distorted image to a flat panoramic image in Cartesian coordinates.

A system providing an inductive power and data link between an external transmitter and miniature internal receiver is presented. The system is suited to applications where the receiver must be of a small size and the system must consume very little power, such as an implanted biomedical device. The system is also compatible with systems where bi-directional communications are required. The novel transmitter and receiver form an improved forward data telemetry system. The transmitter consists of a Class-E converter with its optimum operating frequency being synchronously, instantaneously and efficiently altered in accordance with the data to be transmitted, thereby producing an FSK modulated magnetic field of substantially constant amplitude. The constant amplitude output allows for the continuous, data-independent transfer of power to the miniature receiver and its associated electronics. The present invention also represents an improvement over the high efficiency Class-E converters previously patented by the inventors. The receiver consists of a coil and an integrated rectifying system to recover operating power from the incident magnetic field, as well as an FSK demodulator whose operation is based on the multiphase comparison of charging times of integrated capacitors. The described FSK demodulator approach removes deleterious effects resulting from low-frequency changes in the transmitter frequency, and eliminates time distortion artifacts generated by circuit imbalances and asymmetries in the power recovery process. The combination of the transmitter and receiver improvements yields a reliable data transfer system unaffected by circuit imbalances and incidental variations in the amplitude and frequency of the magnetic field.

The invention discloses a virtual reality system and a scene presentation method thereof. The system comprises a visual angle determination device for determining a visual angle of a user, a graphics processor for rendering a first virtual scene image which is to be presented to the user and corresponds to a determined first visual angle in response to the determined first visual angle, and performing projection transformation on the first virtual scene image in response to a determined second visual angle so as to obtain a second virtual scene image corresponding to the second visual angle, and a virtual scene presentation device for presenting the second virtual scene image to the user, wherein the scene range of the first virtual scene image is larger than the scene range actually presented by the presentation device to the user. Therefore, the problems of dizziness caused by delay of a visual field and a black boundary caused by the schemes such as a time distortion technology can be solved; and the user can better devote to a virtual reality scene, and the use experience of the user is enhanced.

The invention discloses a method for correcting distortion in real time based on a GPU camera and video camera. The method adopts digital image processing technology to calculate a system of nonlinear equations consisting of two radial distortion coefficients, two centrifugal distortion coefficients and two thin prism distortion coefficients by a least square method in a correction algorithm based on a planar grid model so as to obtain a space transformation equation, and carries out synchronous spatial alternation on pixel spots of an image shot by an imaging system so as to obtain an image after distortion correction. The method solves the problem of optical distortion, and improves the correction precision to sub-pixel grade; through adopting the GPU technology with parallel processing capability, the processing velocity is improved by over 40 times, realizing real-time distortion correction (over 30 frame/second) of an 1920*1080 high-definition image, and reducing the processing cost for lens optical design by 20 to 70 percent.

The invention discloses a method for full reference type video quality assessments, an apparatus for full reference type video quality assessments and a video quality testing device for full reference type video quality assessments. The method includes that six different spatial parameters are extracted from each of video components of YUV of each ROI of referencing videos and testing videos, so that a pair of difference matrixes can be achieved, utilizing the pair of difference matrixes, time and brightness rough alignment is performed on the referencing videos and the testing videos, and the result of rough alignment can be achieved. According to the result of rough alignment, time, space, brightness and chromaticity precise alignment is performed on the referencing videos and the testing videos, and the result of precise alignment of the pair of video sequences can be achieved. According to the result of precise alignment of the pair of video sequences, the space distortion analysis and the time distortion analysis are conducted to the referencing videos and the testing videos, four space indexes and one time index can be achieved, and a quality assessment result can be achieved according to the four space indexes and the one time index. According to the method, the method for full reference type video quality assessments, the apparatus for full reference type video quality assessments and the video quality testing device for full reference type video quality assessments is capable of getting better result of rough alignment, and the accuracy of the video quality assessment results can be improved.

The invention relates to a high-speed camera imaging distortion calibration device and method, which comprises a calibration plate, a ranging laser radar, a high-speed camera and an imaging distortioncalibration unit. When imaging distortion is calibrated, the calibration plate is located in the field of view of the high-speed camera and the ranging lidar; the ranging lidar measures the positioncoordinates of the manual calibration points on the calibration board, and the high-speed camera captures a calibration board image including the manual calibration points; the imaging distortion calibration unit takes the coordinates of the manual calibration points measured by the ranging lidar as a reference, calibrates the coordinates of the manual calibration points on the calibration board image taken by the high-speed camera, and calculates the camera internal parameters related to the camera imaging distortion; the imaging distortion calibration unit performs real-time distortion calibration on images captured by the high-speed camera according to the internal parameters.

The present invention discloses a digital signal edge delay correction system and method. The system provided by the invention is in the circuit of a digital communication receiving end and allows the main control chip of the receiving end to comprise a rising edge collection module, a falling edge collection module, a high-frequency counter module, a frame synchronizing signal detection module and a delay correction module through adoption of a logic circuit, a programmable logic device or a software programming method, so that the changing of a high-level holding time and a low-level holding time cased by inconsistent rising edge delay and the falling edge delay generated during level signals passing through a relay or an isolation circuit in the process of digital communication process. The digital signal edge delay correction system and method are able to recover the level holding time distortion of system hardware in the process of digital signal transmission, are universally used in various digital level signal transmission occasions, and are able to decrease the requirement of the system for the hardware transmission speed and reduce the hardware cost and the design difficulty.

The invention discloses an automatic tone adjustment method and system of music accompaniment device and adopts the following technical proposal: a tone estimator is used to calculate the basic frequency of the sound of a user at preset intervals; inside a musical scale sequence recorder, the basic frequency of the sound of the user is converted into a user musical scale sequence to be recorded; a musical scale matcher compares the difference of the user musical scale sequence and a preset music score theme musical scale sequence in a mode similar to dynamic time distortion or calibration; in addition, a transposition judgment device is adopted to determine the transposition and transposition time of accompaniment music; if transposition is needed, the musical scale parameter in a music synthesizer is adjusted automatically; finally, the music synthesizer synthesizes the music score recorded digitally into actual music waveform which is output along with the singing of a user through an audio mixer and a loudspeaker. Therefore, a music accompaniment device can automatically adjust the tone of an accompaniment song according to the tone of a singer.

A method and/or apparatus for embedding and detecting a watermark among a plurality of frames of data is disclosed, where the watermark is correlated with a plurality of noise blocks, and the noise blocks are summed over a plurality of respective video frames. Each noise block is preferably subjected to a fade function with another noise block over the plurality of respective video frames to make the embedded watermark resistant to changes in data frame rate or other temporal distortions in the frames of data. Detection and recovery of such an embedded watermark and its fade function is also provided.

A method encodes a video as video objects. For each candidate object, a quantizer parameter and a skip parameter that jointly minimizes an average total distortion in the video are determined while satisfying predetermined constraints. The average total distortion includes spatial distortion of coded objects and spatial and temporal distortion of uncoded objects. Then, the candidate objects is encoded as the coded objects with the quantizer parameter and the skip parameter, and the candidate objects is skipped as the uncoded objects with the skip parameter.

The invention discloses a video quality evaluation method based on electroencephalogram signals and space-time distortion. The video quality evaluation method mainly solves the problem that an objective video quality evaluation result is inconsistent with human subjective perception due to the fact that human visual characteristics are not fully considered in the prior art, and comprises the following steps of: (1) generating a simulated water surface fluctuation video; (2) generating a space-time distortion video; (3) collecting continuous electroencephalogram signals and performing subjective evaluation; (4) calculating a subjective evaluation detection rate; (5) segmenting the electroencephalogram signals; (6) classifying the segmented electroencephalogram signals; (7) calculating a classification accuracy rate of the electroencephalogram signals; and (8) evaluating the quality of the space-time distortion video. According to the video quality evaluation method, the electroencephalogram signals corresponding to different space-time distortion videos are collected to serve as evaluation bases, and the video quality evaluation method has the advantages that the video quality evaluation result is more consistent with human subjective evaluation and the evaluation result is more accurate.

The invention discloses an animal auditory measurement system based on the optical fiber array laser sound effect. The animal auditory measurement system comprises a sound processor, a laser modulation driver, a laser optical fiber array, an animal auditory tissue test box, an array detector, a data processing module and a sound synthesis module, wherein the sound processor is connected with the laser modulation driver, the laser modulation driver is connected with the laser optical fiber array, signals output by the laser optical fiber array are transmitted to the animal auditory tissue test box, the response of the animal auditory tissue test box is output to the array detector, the array detector is connected with the data processing module, and the data processing module is connected with the sound synthesis module. The animal auditory measurement system has the beneficial effects that 1, the optical fiber array in dense layout is adopted; 2, the multichannel parallel synchronous optical pulse triggering without time distortion is adopted; and 3, the device practically measures the animal auditory sense, the measurement precision is higher, a measuring method is adjustable and controllable, and the data analysis is flexible and convenient.

The invention relates to a method for performing focusing shaping control on a distorted femtosecond laser pulse. The method is characterized in that an optical inverse diffusion algorithm is writtenaccording to a time inversion principle; a phase shift holographic algorithm is written according to a holographic interference principle; light beams output from a laser 1 are incident on a beam splitter 2 and are divided into two parts, one part entering a sample light path 3.1-8 and the other part entering a reference light path 3.2-8. The light beams in the reference light path 3.2-8 are reflected onto an isosceles prism 10 by a second mirror 3.2 and a third mirror 3.3, the light beams are reflected to a fourth mirror 3.4 by the isosceles prism 10, and the light beams are reflected by thefourth mirror 3.4 and then input to a two-dimensional spectrometer 8. According to the method in the invention, the spatial freedom of the wave-front in a spatial light modulator is controlled by running the optical inverse diffusion algorithm through a computer, thereby realizing simultaneous focusing shaping control on the spatial distortion and time distortion of the femtosecond laser pulse.

The invention relates to a wide-angle camera irregular distortion global correction method, and belongs to the field of visual measurement. The method comprises the following steps: S1, picture collection: using related software to make an auxiliary line for a collected image, and displaying the auxiliary line in real time; Aligning the auxiliary lines to the central area of the checkerboard, andshooting a picture; S2, corner detection; S3, checkerboard detection: for the detected corner, detecting a checkerboard through a growth method; S4, data initializing; S5, curved surface fitting: fitting an interpolation curved surface by using an improved thin plate spline interpolation TPS method; S6, generation of an interpolation map: reversely solving the interpolation map by using the obtained interpolation curved surface; And S7, real-time distortion correction: loading an interpolation map, collecting pictures in real time, and carrying out distortion correction in real time. Accordingto the method, some irregular (symmetrical) distortion can be corrected, and compared with an original TPS interpolation method, the edge precision and the observability outside a control point are improved.

The invention discloses a nonuniform sampling-based image correction system and a nonuniform sampling-based image correction method. The system comprises an analog video signal receiving module, a signal sampling module and a sampling control module; the signal sampling module is connected with the analog video signal receiving module and the sampling control module; and the sampling control module controls the signal sampling module to sample an analog video signal, realizes the nonuniform sampling of the analog video signal, and realizes the real-time distortion correction and the acquisition of a video image. The nonuniform sampling-based image correction system and the nonuniform sampling-based image correction method provided by the invention have the advantages of realizing the real-time correction through the nonuniform sampling while sampling, saving processor resources, having relatively small time delay, and improving the correction speed of an image.

With regard to a distortion correction apparatus and method which are applicable to hardware for real-time distortion correction, provided are a distorted image correction apparatus and method for correcting a distortion of an image by using a non-polynomial estimation function suitable for a hardware operation, and for correcting the distortion of the image by utilizing a morphing form.

This invention provides a technique of speeding up decoding processing by omitting several processes while reducing the influence of omission of processes on image quality in accordance with the variable magnification ratios at which images are to be decoded and displayed. For this purpose, an apparatus according to the invention analyzes the header of decoding target encoded image data. The apparatus then obtains information indicating how many times distortion suppression processing has been executed at the time of the generation of the encoded image data. The apparatus decides which process can be omitted, based on the set variable magnification ratio and the information extracted from the header, and generates an image on which an output is based, by executing the processes which are not to be omitted. The apparatus then re-sizes the image in accordance with the set magnification ratio.

The invention discloses a unidirectional agent method and a unidirectional agent system based on DPDK. The method comprises the steps as follows: a first agent end is guided by a bootstrap protocol according to a boundary route and adopts a DPDK to receive a response message of a response end; the first agent end modifies original message header information of the response message to be new message header information, meanwhile builds a mapping relation between the original message header information and the new message header information, and sends the modified response message and the mapping relation to a second agent end according to the new message header information; and the second agent end recovers the response message according to the mapping relation, and sends the recovered response message to a request end according to the original message header information. The method and the system provided by the invention do not change the original connection relation between the request end and the response end, have the advantages of high performance, free of requirement on resource connection and small memory footprint, well avoids the problems of exhausting of port, memory and connection resources, and also solves the problem of connection time and request response time distortion.

The subject of the invention provides an efficient motor control device capable of reducing noise caused by resonance of fans and rotators. The motor control device is provided with an inverter for converting DC power into variable voltage variable frequency AC power and performing driving control on a three-phase motor; a vector control part for applying voltage on the three-phase motor; a motor current signal information generation part for generating signal information of motor current of the vector control part; a dead zone time distortion compensation part for generating dead zone time distortion compensation values from the signal information of motor current of the motor current signal information generation part; a dead zone time distortion compensation addition part for adding the applied voltage of the vector control part with the dead zone time distortion compensation values of the dead zone time distortion compensation generation part; and a PWM pulse generation part for performing pulse width control on the inverter according to the signals of the dead zone time distortion compensation addition part, the dead zone time distortion compensation values periodicity change nearby a current zero crossing point.

The invention belongs to the technical field of image processing and provides an animation rendering method, an animation rendering system and an animation player, wherein the animation rendering method and the animation rendering system can render three-dimensional animations. The animation rendering method comprises the steps of predefining a plurality of states of an animation to be rendered and state render attribute of each state under a time distortion axis, using a source state, a target state and a trigger event in the plurality of states as correlation information to be stored, switching the existing state to the target state corresponding to the existing state according to the trigger event and stored correlation information under the condition that the existing state serves as the source state, and rendering the animation to be rendered according to the existing state and the state render attribute of the existing state under the time distortion axis. The animation rendering method and the animation rendering system are based on finite-state machine theory, simplify a control frame of animation rendering, are small in calculated amount, clear in structure and simple and definite in logical relationship and have high operability.

The invention discloses a real-time distortion image processing accelerator which comprises a coefficient-taking DMA module, an original image-taking DMA module, a R-row BUF control module, a G-row BUF control module, a B-row BUF control module, an R interpolation module, a G interpolation module and a B interpolation module. An original image mapping coordinate is blocked, and the range of original image data is determined according to a coordinate ordering result of points dropping into each block, so that the filter window span is greatly reduced, the requirements on a buffer storage space of image data are reduced, repeated reading is avoided and bandwidth waste is avoided. The corresponding relationship between the line number in each block and a pointer is built by using a table building method, and the data-taking search time is shortened.

The invention belongs to the field of full-reference video quality evaluation, and particularly provides a full-reference video quality evaluation method based on motion estimation, which comprises the following steps: firstly, calculating the change of video content gradient information caused by distortion in space, and obtaining a spatial distortion score value of a video through a two-step time pooling mode; fusing the difference between the local mean value of the motion vector diagram and the standard deviation variable coefficient, the difference between the variable coefficients of the motion vectors at the same position of the adjacent frames and the spatial distortion characteristics to obtain a space-time distortion score value of the video; and finally, fusing the spatial distortion score value and the space-time distortion score value to obtain a final video quality prediction value. According to the method, the motion information is introduced into the video quality evaluation method, so that the accuracy of video quality prediction can be remarkably enhanced, and an objective video quality evaluation method with higher consistency with subjective feeling of human eyes is further obtained.