141 results about "Distortion ratio" patented technology

A method and a device are described for selecting between multiple available filters in an encoder to provide a frame having a low error and distortion rate. For each full and sub pixel position, determining whether to use an alternative filter over the default filter during interpolation by estimating the rate distortion gain of using each filter and signaling to the decoder the optimal filter(s) applied to each full and sub-pixel position. In one embodiment, identifying a reference frame and a current frame, interpolating the reference frame using a default filter to create a default interpolated frame, interpolating the reference frame using an alternative filter to create an alternative interpolated frame, determining for each sub-pixel position whether to use the default filter or the alternative filter based on a minimal cost to generate a final reference frame.

The embodiment of the invention discloses a self-adaptable prediction method, comprising the steps as follows: block division is carried out on micro-blocks required to be predicted in frame by a plurality of block division methods; a plurality of prediction modes are used to predict each sub-block in each block division result, thus gaining the sub-block residue of the current sub-block; according to the type of the sub-block, a plurality of conversion types are selected to convert the residues of each sub-block, thus gaining the ratio of bit rate and distortion of the current sub-block; the micro-block is predicted according to the minimum ratio of the bit and the distortion out of all bit rate/distortion ratios, the prediction mode and the conversion method. The embodiment of the invention discloses a self-adaptable prediction device which comprises a block division module, a prediction module, a conversion module, a selection module and a frame prediction module; the method and the device can smartly carry out the coding in frames or between frames of the micro-blocks, adapt for the local vein statistical characteristics of the micro-block better and improve the coding efficiency.

The invention relates to a method and circuit for linearizing amplifiers and other nonlinear circuits for multi-carrier signals. An output signal from the amplifier is sampled, and a correlation matrix of size N×N is computed from the sampled signal, wherein N exceeds the number of multiplexed carriers in the signal. A signal-to-distortion ratio (SDR) is then estimated based on a ratio of one or more largest to one or more smallest eigenvalues of the correlation matrix, and the signal into the amplifier is pre-distorted so as to maximize the SDR.

The invention discloses an adaptive control method of a power factor. The adaptive control method comprises the following steps of: generating three voltage reference values by calculating, multiplying the three voltage reference values, taking a product of the three voltage reference values as a current reference value, comparing the current reference value with a direct current bus current, and outputting a calculation result after carrying out current error compensation processing; determining a duty ratio by virtue of the calculation result to form a pulse signal, controlling the make-break operation of a chopper to carry out chopping processing on a direct current voltage rectified and output by a rectifier bridge, generating a smooth direct current bus current and an alternating current input current in a same phase with an alternating current input voltage, improving the power factor, and reducing the current harmonic distortion ratio. A power factor correction method, provided by the invention, can be used for realizing the adaptive control on alternating current power supplies in different frequencies. The adaptive control method of the power factor is applied into variable frequency air conditioner products, and can be suitable for air conditioners based on inputs of 50-Hz and 60-Hz alternating current power supplies; and according to the adaptive control method of the power factor, a design purpose that a development is suitable for multiple types of machines is really achieved, the development period is shortened, and the research and development costs are lowered.

An apparatus and method for compensating images in a display device is disclosed. Distortion ratios of image blocks are calculated based on a gray value difference between each of a plurality of pairs of pixels in the image blocks that face each other at a boundary between the image blocks. Compensation parameters are set based on the calculated block distortion ratios. Distortion compensation values of the image blocks are calculated based on the gray value difference and the set compensation parameters. The image blocks are then compensated according to the calculated distortion compensation values.

Embodiments are described which exploit a finding, according to which a higher compression rate or better rate/distortion ratio may be achieved by adopting or predicting second coding parameters used for encoding a second view of the multi-view signal from first coding parameters used in encoding a first view of the multi-view signal. In other words, the inventors found out that the redundancies between views of a multi-view signal are not restricted to the views themselves, such as the video information thereof, but that the coding parameters in parallely encoding these views show similarities which may be exploited in order to further improve the coding rate.

The invention relates to a method for culturing a Stichopus japonicus seed, which belongs to the technical field of a Stichopus japonicus seed culturing method and comprises the following steps of (1) fishing and catching; (2) screening; (3) transporting and (4) culturing the Stichopus japonicus seed. According to the method for culturing the Stichopus japonicus seed disclosed by the invention, the culturing process is easy to operate, the Stichopus japonicus seed is scientifically selected and fished and caught in advance; the Stichopus japonicus seed can be matured in advance and lay eggs by utilizing the method of indoor heating and accelerating, thus, large-scale seeds can be cultured in the same year, and the produced Stichopus japonicus seed has enhanced hereditary capacity, strong resistance and good property; moreover, as the feed of the Stichopus japonicus seed and the water temperature and the water quality in the Stichopus japonicus culturing pond are strictly controlled, the fecundity of the Stichopus japonicus is better than that of the Stichopus japonicus cultured in the pond and the intertidal zone, thus, the laid eggs have good quality and the distortion ratio at each stage is high.

The invention provides an anti-distortion processing method for images, an anti-distortion processing device for images and a computer readable storage medium. The method comprises the steps of: calculating original coordinate distances and original pixel distances from to-be-rendered pixel points to a central point; referring to an anti-distortion ratio table according to the original pixel distances and acquiring anti-distortion ratios corresponding to the original pixel distances; performing calculation according to the original coordinate distances and the anti-distortion ratios to acquirecorrection coordinate values of the pixel points. The method is simple to implement; anti-distortion processing can be achieved only by presetting an anti-distortion ratio table and performing simpleoperation and table query operation; the method is suitable for anti-distortion processing of all lenses; the values of the anti-distortion ratio table are the anti-distortion ratios of pixel pointswhich are the same distance away from the central point, so that the table is small and can be transmitted easily during rendering of a tinter.

The invention discloses an integrating triangular modulating device with matched dynamic elements, comprising an adder, a loop filter and a quantizer, wherein the adder receives an analog input signal and a feedback signal to generate an error signal; the loop filter generates a filtering signal according to the error signal; and the quantizer converts the filtering signal into a quantization output signal. A D/A conversion system comprises a plurality of D/A elements and a dynamic element matching device, wherein the plurality of D/A elements generate a corresponding feedback signal which is equal to the quantization output signal, and the dynamic element matching device receives the quantization output signal, sets one element in the D/A elements as a non-participation element, sets other elements as the participation elements, and selects the participation element corresponding to the quantization output signal according to the quantization output signal and the participation elements. The invention can increase the randomness of selection of the D/A elements corresponding to digital input codes so as to further increase the signal noise distortion ratio.

The invention discloses an encoding method, an encoding device, a decoding method, a decoding device, electronic equipment and a storage medium, and belongs to the technical field of data processing.The encoding method comprises the following steps of: dividing an image to be encoded into a plurality of image blocks, performing feature transformation on a first image block in the plurality of image blocks through using a transformation convolutional neural network to obtain a first transform domain component corresponding to the first image block, and quantizing the first transform domain component to obtain a quantization result of the first transform domain component; determining probability distribution of the quantization result of the first transform domain component through using aprobability estimation network; and encoding the quantization result of the first transform domain component based on the probability distribution of the quantization result of the first transform domain component. The sizes of the plurality of image blocks are possibly different, so that the compression rate and the distortion rate of the encoded image can be further ensured after the image blocks with different sizes are encoded on the basis of feature change of the transform convolutional neural network.

The invention provides a pixel structure, a display panel and a display device, and belongs to the technical field of display. The pixel structure is applied to a display device included in an optical imaging system. The optical imaging system further includes an optical system. An image displayed on the display device is amplified by the optical system and then projected to the pupils of a viewer. The pixel structure comprises multiple pixel units. The position of each pixel unit on a display panel forms a first preset relation with the offset center of the pixel unit, the offset of the pixel unit and the pixel coordinate of the pixel unit, wherein the offset center corresponds to the distortion center of the optical system, and the offset corresponds to the distortion ratio of the optical system. When a display device with the pixel structure provided by the invention and a corresponding optical system form an optical imaging system, the display device can effectively compensate the distortion of the optical system and guarantee the imaging resolution of the optical imaging system.

A nonreducing dielectric ceramic comprising a (Sr, Ca)(Ti, Zr)O3-based perovskite principal crystal phase containing 55 mole percent or more of SrTiO3 and whose powder CuKalpha X-ray diffraction pattern exhibits a ratio of less than 5% of the maximum peak intensity of the accessory crystal phases being the other crystal phases to the intensity of the maximum peak of the perovskite crystal phase, which is present at 2theta=25° to 35°. This strontium titanate-based nonreducing dielectric ceramic has a high relative dielectric constant of 150 or more, a low third-order harmonic distortion ratio, and an excellent reliability in a high temperature-loading test. Accordingly, it is advantageously used for forming dielectric ceramic layers of a monolithic ceramic capacitor.

A wavelet transform, binary arithmetic coding and pass-by-pass partitioning of coded data streams according to JPEG 2000 are carried out and first and second layers for which the decoded image will have distortion ratios within a desired range are generated. If the total amount of code in the first layer is smaller than a target amount of code, then, from among coded data streams contained in the second layer, coded code up to a pass within a coded data stream having little influence upon image quality is added to the first layer. If the total amount of code in the first layer is greater than the target amount of code, then, from among coded data streams contained in the first layer, coded code within a coded data stream having little influence upon image quality is deleted from the first layer.

The invention discloses a high frequency switch circuit for inhibiting substrate bias effect in a sampling hold circuit, comprising a first substrate bias-inhibiting high frequency switch unit, a second substrate bias-inhibiting high frequency switch unit and a transmission gate switch, wherein the first substrate bias-inhibiting high frequency switch unit consists of two NMOS (N-channel Metal Oxide Semiconductor) transistors and two PMOS (P-channel Metal Oxide Semiconductor) transistors, the second substrate bias-inhibiting high frequency switch unit consists of two NMOS transistors and two PMOS transistors and the transmission gate switch consists of one NMOS transistor and one PMOS transistor. In the high frequency switch circuit, because a feed through signal introduced by a switch parasitic capacitor can be grounded through a by-pass, the variation of the input end does not affect the output end after the switch is turned off, thereby the hold function of high precision is realized. The switch design of inhibiting the substrate bias effect is utilized. Because the variation of a threshold voltage caused by the inequality of a substrate and a source electric potential is inhibited, the linearity of the equivalent resistance of the switch circuit is better and the signal-to-noise distortion ratio of the circuit is improved.

The invention discloses a point cloud geometric lossy compression method based on voxel convolution. Compression and decompression are carried out by carrying out convolution and deconvolution on voxels of a point cloud through a training model. Firstly, voxelization is carried out on point cloud data, a certain grid size is selected for voxels of point cloud to carry out 3D convolution operationto obtain feature data with smaller shapes and sizes, quantization processing is carried out on the feature data after convolution, uniform quantization noise is added during model training to improvethe generalization of the model, and the quantized data is compressed. During decompression, deconvolution is performed on the quantized feature data to obtain feature data of which the size is consistent with the shape and size of the initial point cloud voxel, normalizing the feature data, and judging whether each voxel unit is empty or not through a threshold value to obtain decompressed pointcloud data. During model training, focus loss is used as distortion loss to reduce the influence of too many voxel hollow samples on the model. According to the method, geometric compression can be efficiently carried out on the point cloud data, and the distortion rate after restoration is reduced.

The invention discloses a background calibration method based on related SAR ADC capacitor mismatch errors. Pseudo-random signal PN is injected into the margin voltage by using a detection skip algorithm and an alignment switching technology, and then the digital signal and the pseudo-random signal PN are subjected to related operation at the background, so that the capacitor mismatch error can beextracted. Because the weight error injected into the margin voltage is very small relative to the total capacitance, the margin increment caused by injection can be ignored. Therefore, the calibration algorithm does not need to increase the condition of extra circuit detection injection, and can also minimize the overhead of a redundancy range. Simulation results show that after correction, thesignal-to-noise distortion ratio is increased from 35.9 dB to 61.1 dB, and the spurious-free dynamic range is increased from 41.2 dB to 79.3 dB.

The invention discloses improved data weighed averaging algorithm, which can restrain a tone effect well. In the algorithm, two counters control a second barrel type shift register to correct the result of the traditional data weighed averaging algorithm. The invention also provides a device for realizing the algorithm, which comprises a delay unit, a summing device, a thermometer code generator,a first barrel type shift register, a first comparator, a first counter, a second comparator, a second counter and the second barrel type shift register. The improved data weighed averaging algorithmcan well resolve the contradiction between a signal-to-noise distortion ratio and the tone effect; on the whole, the algorithm ensures that unit elements are used averagely, so that the great attenuation of the signal-to-noise distortion ratio is avoided; and locally, the algorithm can break the regularity of the unit element selection, restrain the tone effect to the largest extent and greatly reduce the in-band tones.

The invention discloses a method for controlling the level of a digital audio signal. The method mainly comprises the following steps: searching the maximum sample absolute value and the average sample absolute value of a current-frame audio signal by taking each frame of audio signal as the unit, comparing the maximum sample absolute value of the current-frame audio signal with the maximum sample absolute value of a previous-frame audio signal, judging the signal strength change tendency so as to obtain different first-order recursive smooth filter parameters, adjusting the maximum sample absolute value of the current-frame audio signal, obtaining an expected gain by utilizing an expected sample absolute value, and finally, obtaining a practical gain adjustment value of the current-frame audio signal in combination with a first-order recursive smooth filtering theory. According to the invention, the strength change of a signal source is judged according to the maximum sample absolute value, the sample absolute average value, the expected level and the pre-set parameters of a voice-frame signal; configuration parameters are updated; the gain value is obtained in combination with first-order smooth filtering; therefore, the algorithm complexity is reduced; the self adaptability of an algorithm is improved; and distortion rate and volume requirements of output audio signals can be satisfied.

A method of correcting an image with perspective distortion and creating an artificial image with perspective distortion is disclosed. First, image data including a distorted object image are received. Next, the user inputs an operational instruction for setting a plurality of distortion parameters pertaining to the image data, which include a distorted side of the distorted object image, a central line and a distortion ratio. Thus, a plurality of coordinates of corners of the distorted object image are calculated according to these distortion parameters and a transformation matrix is determined according to the calculated coordinates of the corners of the distorted object image. Finally, the distorted object image is transformed to a corrected object image according to the transformation matrix.