143 results about "Distortion ratio" patented technology

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.

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 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 present invention is directed to a variable distortion aberration image pickup device that is capable of varying distortion aberration with its center at any desired point either inside or outside an image where, specifically, distortion aberration is effectively developed and / or eliminated with the distortion center at any desired point both inside and outside the image as desired, and such an image pickup device is also capable of varying distortion aberration with its center at a desired point either inside or outside the image, separately in individual directions, where specifically an image is processed so as to have distortion aberration with its center at any desired point both inside and outside the image, with varied distortion ratios from one direction to another. For that purpose, the variable distortion aberration image pickup device is comprised of a photograph lens, two-dimensional opto-electronic feedback elements, and a distortion aberration conversion circuit that receives output image signals from the two-dimensional opto-electronic feedback elements to dislocate a desired point of an image in some direction(s) from the given center of distortion.

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 a method of three-dimension image data compressing and processing. Regular quadrilateral surfaces are used instead of triangle surfaces, and the steps of re-gridding, subdivided wavelet construction, zero-tree compressing and entropy coding are used for compressing the image data, so a quadrilateral surface based geometric image compressing method is provided. The invention can better adapt and fulfill the requirements of quick development of the three-dimension displaying data collecting technologies and application of the technologies. The invention can help achieving a better compressing effect for complex models, the models can be gradually transmitted, and the distortion ratio is small, controllable and adjustable. Prior available storing and transmitting capacities can be better used to reduce limits and influences of prior hardware and network facilities to three-dimension display technologies.

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 relates to a high-definition infrared fingerprint acquisition device, and aims at solving the problems that the existing acquisition device is apt to be interfered by conditions and the definition cannot satisfy requirements. The high-definition infrared fingerprint acquisition device consists of a non-isosceles trapezoidal prism, a light source, lenses, a photoelectric detector and a plastic molded pipe support which is used for shielding ambient light and supporting the parts and has a rectangular cross section. The trapezoidal prism with an inclined acquisition surface is obliquely assembled on the plastic molded pipe support. A fingerprint acquisition light path sequentially consists of the trapezoidal prism, a Huygens lens set and the photoelectric detector. A fingerprint acquisition surface is arranged on the lower base surface of the trapezoidal prism, an oblique leg surface adjacent to the larger base angle of the trapezoidal prism is an optical transmission surface and the light source is configured on the upper base surface of the trapezoidal prism. The light source is an infrared light source. An oblique leg surface adjacent to the smaller base angle of the trapezoidal lens is used as an optical black substrate which is coated with black paint. An infrared light filter is additionally assembled between the lenses and the photoelectric detector or between the lenses. The upper base surface of the trapezoidal prism is a rough surface. The high-definition infrared fingerprint acquisition device has the advantages of high acquired image definition, evenness, small deformation rate, low distortion rate, high imaging quality, strong image contrast, bright lines, resistance to external ambient light interference, high dry and wet fingerprint acquisition sensitivity, simple structure and convenience in manufacturing, installation and use.

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 successive approximation register (SAR) analog-digital converter (ADC) and a method of driving the same are provided. The SAR ADC includes a first converting unit including a bit capacitor array corresponding to the number of bits and a correction capacitor array, a comparator outputting a high or low voltage corresponding to each capacitor according to an output voltage of the converting unit, and a correction unit correcting the output of the bit capacitor according to the output of the correction capacitor array among the high or low output of the comparator. Therefore, two bits having the same capacitance as a least significant bit (LSB) enable a digital output error to be corrected, so that a spurious free dynamic range (SFDR) of the signal converter is increased, and a signal to noise and distortion ratio (SNDR) of an output signal is improved.

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 real-time video super-resolution processing method integrated with cortex-A7. The method includes that (1), video sampling is performed, and a low-resolution video frame is obtained and input to a system on chip (SOC); (2) the low-resolution video frame is sequentially subjected to complexity processing, feature vector extracting and sample set training, feature vectors to be matched are obtained, and a sample set is established by high-resolution high-frequency components; (3) according to the feature vectors to be matched, the low-resolution video frame is subjected to super-resolution processing by means of an improved super-resolution algorithm based on cluster dictionary self-learning and feature sparse representation and combination with SOC coding and decoding technologies, and thereby, a high-resolution video frame flow is output. The real-time video super-resolution processing method integrated with cortex-A7 has the advantages of real time, low distortion rate and processing costs and high processing speed and qualities, and the method can be widely applied to the field of video image processing.

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 embodiment of the invention discloses a rate-control-based video coding method and a rate-control-based video coding device. The method comprises the following steps of: before a current macro block to be coded is coded, judging whether a current quantization coefficient is within a preset quantization coefficient limit interval or not; if the current quantization coefficient is within the quantization coefficient limit interval, coding the macro block to be coded according to the current quantization coefficient, otherwise coding the macro block to be coded according to an interval value of the quantization coefficient limit interval; and computing the coded bit number and distortion of the current coded macro block, and updating the current quantization coefficient according to a current network bandwidth and the coded bit number and distortion of the current coded macro block. According to the embodiment of the invention, network congestion and packet loss phenomena can be avoided.

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.

An audio codec supporting both, time-domain and frequency-domain coding modes, having low-delay and an increased coding efficiency in terms of iterate / distortion ratio, is obtained by configuring the audio encoder such that same operates in different operating modes such that if the active operative mode is a first operating mode, a mode dependent set of available frame coding modes is disjoined to a first subset of time-domain coding modes, and overlaps with a second subset of frequency-domain coding modes, whereas if the active operating mode is a second operating mode, the mode dependent set of available frame coding modes overlaps with both subsets, i.e. the subset of time-domain coding modes as well as the subset of frequency-domain coding modes.

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 class-D amplifier with dual feedback loop scheme has a gain adjusting circuit, a second-order integrator, two comparators, a logic circuit and an output driver. Two differential output terminals of the class-D amplifier are connected to two differential amplifiers of the second-order integrator to construct a second-order feedback loop for offering second order noise shaping, eliminating non-linear components in the class-D amplifier, and also enhancing signal to noise and distortion ratio (SNDR). Further, distortion component existing in the differential signal output from the differential output terminals is amplified by the two differential amplifiers so as to improve the loop gain of the class-D amplifier. The differential signal processed by the two differential amplifiers also can be precisely adjusted.

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.