21 results about "Gray code" patented technology

The application discloses a physical layer key generation method and system based on Gray-CDF quantization and adaptive LDPC syndrome negotiation. The legal communication parties acquire channel characteristic sequences in reciprocal wireless channels, determine multi-level equal probability quantization thresholds according to empirical cumulative distribution functions of local channel characteristics, and adopt Gray codes to map adjacent quantization intervals into code words with only one different bit, so as to generate original key sequences; subsequently, LDPC syndrome lengths are adaptively determined according to current channel quality or initial bit inconsistency rate estimation values, the syndromes are disclosed through a public channel to complete key error correction, and retry or discard processing is performed on decoding failure frames; after successful negotiation, privacy amplification is performed according to disclosed leakage, and a consistent key is obtained. The application can improve original key generation rate, reduce negotiation disclosure, and improve the reliability of physical layer key generation and the available key rate.

This disclosure provides a robot control method, comprising: calibrating an RGB camera to obtain a coordinate transformation matrix between the camera coordinate system and the world coordinate system; attaching Gray code coded points to each joint position of the robot, obtaining the spatial position information of the Gray code coded points through the RGB camera, thereby obtaining the robot's pose and joint position in the world coordinate system; using the camera to acquire image sequences of the human-robot collaborative environment in real time, processing the images in the image sequences to obtain human key points and semantic information of the key points; performing stereo vision matching on the semantic information to obtain human pose information; establishing a human body model based on a capsule bounding box, and calculating the minimum human-robot distance through the human body model; obtaining a human-robot safety index based on the minimum human-robot distance; and selecting a safe and compliant control strategy for the robot based on the human-robot safety index, and using the safe and compliant control strategy to control the robot.

This application relates to a two-stage Gray code counter with redundant bits. An N-bit counter includes a lower counter having a first output of M bits, the lower counter operating at a first count frequency. An upper counter having a second output of N-M+L bits operates at a second count frequency. The second count frequency is equal to the first count frequency divided by 2 (M‑L) An error correction controller is coupled to receive the first and second outputs and to perform operations including comparing L least significant bits (LSBs) of the second output to at least one most significant bit (MSB) of the first output, and correcting N-M MSBs of the second output in response to the comparison. The lower bits of the N-bit counter are the M bits of the first output, and the upper bits of the N-bit counter are the corrected N-M MSBs of the second output.

The present application relates to the technical field of visual detection, and discloses a gear tooth profile defect detection method and system based on image recognition, the method comprising: carrying out pixel-level gray difference coding on a gear end face original image to obtain a gray coding sequence; based on the gray coding sequence, carrying out neighborhood comparison on the Hamming distance between pixels in the gear end face original image to obtain a local anomaly distribution; carrying out intensity sorting screening on the local anomaly distribution to obtain a candidate abnormal seed point; taking the candidate abnormal seed point as a starting point, carrying out similarity weighted region growing on the candidate abnormal seed point to obtain a suspected defect region; carrying out consistency checking on the suspected defect region, carrying out outlier elimination on the pixel coding deviation value of the checked region to obtain a refined defect region, and carrying out edge smoothing processing on the refined defect region to obtain a gear face damage region of the gear end face original image; the present application can improve the efficiency of a gear tooth profile defect detection based on image recognition.

This invention discloses a parity check circuit and data verification method for a global Gray code counter in CMOS image sensors, relating to the field of automotive-grade CMOS image sensor technology. It aims to solve the problems of existing CIS architectures being unable to cover the entire data sampling verification chain, the large area overhead of traditional parity check circuits, and verification failures caused by asynchronous sampling timing misalignment. The parity check circuit includes a Gray code data input terminal, a parity bit generator, and a storage write control terminal. The parity bit generator utilizes the conversion characteristics between Gray code and binary code to generate an even parity bit by bitwise XORing the high N-i bits of an N-bit Gray code. This parity bit is equivalent to the i-th bit of the corresponding binary code and maintains a fixed phase deviation from the Gray code. The storage write control terminal controls the data and the parity bit to be written to the storage unit according to the phase deviation. This invention achieves end-to-end data reliability verification, significantly reduces chip area, adapts to asynchronous sampling timing, and meets the functional safety requirements of automotive-grade CIS.

This invention discloses a stripe projection 3D imaging system based on a Micro-LED array. Its 3D information acquisition module consists of an integrated packaged Micro-LED driver board, a Micro-LED array, a micro-projection module, and a CCD camera. The 3D reconstruction module utilizes a computer. The micro-projection module is equipped with a plano-convex lens and a mechanical focusing damping structure, and is separately arranged in the front and rear optical paths of the Micro-LED array. The system's workflow is as follows: the driver board reads pre-stored stripe pattern data and timing-controls the Micro-LED array to output coded structured light stripes; the focusing structure adjusts the object distance in the optical path, focusing and scaling the stripes before projecting them onto the surface of the object being measured; the CCD camera simultaneously acquires a sequence of deformed images modulated by the object's shape and transmits it to the computer; the computer combines a multi-step phase-shifting algorithm and Gray code rules to complete phase calculation and unfolding, and, combined with a preset phase-height mapping relationship, reconstructs the 3D shape and point cloud data of the object being measured. This invention enables low-cost, miniaturized, and high-performance 3D shape measurement.

This invention provides a method and system for detecting the flatness of a self-insulating concrete wall with a stone-like paint finish. Specifically, a composite structured light pattern is projected onto the wall surface to be tested. The pattern uses logarithmically modulated sinusoidal fringes as a high-resolution phase carrier, and Gray codes encoding two-dimensional absolute position information are superimposed on the chromaticity channels. Deformed pattern images are acquired simultaneously, and a frequency response confidence map is generated based on the image. A global energy function containing confidence weights and smoothing constraints is constructed, and a high-precision absolute phase map is obtained by solving it and converted into an initial three-dimensional point cloud. A high-fidelity three-dimensional point cloud is obtained through weighted nonlinear optimization. The three-dimensional point cloud is converted into a depth-height map, and decomposed to the scale of the corresponding detection standard through a two-dimensional discrete wavelet transform associated with physical scales. The L1 norm of the key scale wavelet detail components is calculated, and the macroscopic undulations and surface texture energy coefficients are separated to achieve a quantitative representation of the macroscopic flatness deviation of the wall surface.

The application discloses a semantic segmentation method based on phase profile constraint and belongs to the technical field of computer vision. The method uses a calibrated camera-projector system to collect a two-dimensional texture image and a deformed fringe image of a to-be-measured scene under the same field of view; the deformed fringe image is solved through multi-step phase shifting and Gray code technology to obtain an absolute phase distribution and calculate a gradient field; according to a preset mutation condition, a physical edge profile reflecting the depth change of an object is extracted from the gradient field; the physical edge profile is mapped into the two-dimensional texture image based on the corresponding relationship of pixel coordinates to accurately define the semantic object area, the corresponding category label is given, and finally a semantic label mask image is generated. The application uses physical phase information to correct the uncertainty of visual texture edges, effectively solves the edge extraction problem under a complex light scene, realizes the automatic generation of semantic segmentation data, and improves the training precision and robustness of a semantic segmentation model.

This application discloses an encoding converter and encoding conversion method, relating to the field of digital circuit technology. The encoding converter includes: a trigger signal control circuit and an encoding state generation circuit; the trigger signal control circuit is connected to the encoding state generation circuit; the trigger signal control circuit is used to acquire a first number of encoding states and a first maximum number of encoding states, and sends the judgment result of the numerical relationship between the first number of encoding states and the first maximum number of encoding states to the encoding state generation circuit. By implementing the encoding converter and encoding conversion method described in this application, when the number of states in the state machine is less than the maximum number of Gray codes, a first encoding transition state is generated, causing the Gray code state to transition from the final state to the first state through the transition state, and the operation corresponding to the transition state is set to a no-operation. This avoids metastability caused by the simultaneous flipping of multiple bits in the Gray code, ensuring the security of data operations.

A new coding method for digital fringe projection is proposed, which is based on the principle that the adjacent codewords of traditional Gray code only have one bit changed. Then, the large and small period combination coding method is used to uniquely mark the wrapped phase period. The small period code pattern is designed as an equal period code pattern. The large period code pattern is consistent with the design principle of traditional complementary Gray code, and its period becomes smaller with the increase of Gray code bits. This method has the advantages of wide application range, high robustness and strong noise resistance.

This provides a high-performance disk device. Multiple first-servo sectors are arranged with circumferential spacing within the disk. Each of the multiple first-servo sectors includes a first region and a second region. First information, including a preamble, servo flag, and Gray code, is written to the first region. The second region is located behind the first region in the circumferential write / read direction and is written with second information including a burst pattern. The multiple first-servo sectors include multiple second-servo sectors and multiple third-servo sectors. One or more third-servo sectors are arranged between two adjacent second-servo sectors. The circumferential length of the first region in each of the multiple third-servo sectors is longer than the circumferential length of the first region in each of the multiple second-servo sectors.

The application discloses a three-dimensional reconstruction method and device based on phase shift Gray code hybrid coding, relates to the technical field of structure light three-dimensional reconstruction, and solves the problems of insufficient three-dimensional reconstruction precision, weak robustness and slow response speed in a complex operation scene. The method provides a complete reconstruction chain, guarantees the reconstruction precision and robustness by combining high-frequency phase with Gray code auxiliary phase shift, and guarantees the accuracy of high-frequency phase unwrapping without adding too many patterns by combining low-bit inverse code and jump detection, so that high-precision three-dimensional reconstruction is realized.

This invention discloses a high-precision timing method, device, medium, and program product for chips, relating to the field of timing. The high-precision timing method for chips includes: creating a desired timer and a global timer on the current chip; performing start offset compensation on the global timer of the current chip based on a cold reset signal and a start compensation value, and performing periodic frequency offset compensation on the global timer of the current chip according to the period difference between the desired timer and the global timer; and aligning the compensated global timer across clock domains using Gray code cross-clock synchronization. The technical solution of this invention can improve the timing accuracy of the global timer on the chip.

The application provides an array readout control circuit based on synchronous control code multiplexing and bus multiplexing, and relates to the technical field of integrated circuits. A column selection gray code counter is connected with a decoder, and is used for generating a synchronous control code. After being decoded by the decoder, the synchronous control code generates a one-hot column selection signal and a segmented phase signal. A column-level register unit is connected with the decoder, and includes a plurality of group register units and a plurality of column readout register units. Each group register unit stores two columns of pixel quantization data of an odd column and a right adjacent even column based on the segmented phase signal. Each column readout register unit stores pixel quantization data in the corresponding group register unit based on the segmented phase signal. The application significantly reduces the chip physical area occupied by the bus and the parasitic interference introduced by a large number of parallel buses, improves the pixel integration, reduces the power consumption, and reduces the time sequence complexity. The two-level bus structure can shorten the bus establishment time, improve the establishment accuracy, and enhance the accuracy and stability of data output.

The application provides a kind of edge side industrial data lightweight pretreatment cache method, belong to industrial data technical field, the application is through Gray code anti-interference coding to improve data acquisition quality, adaptive sampling rate adjustment and weak abnormal feature weight vector realizes dynamic sampling, wavelet decomposition and high frequency fault feature sparse matrix accurately locates fault position, semantic perception compression encoder cooperates with dispersion evaluation matrix and carries out differential coding, and network transmission graph model optimizes transmission path, this overall systematic technical scheme from signal acquisition, adaptive processing, intelligent compression, dynamic cache management to network optimization each link, solves the technical problems that the cache occupancy rate is too high and the data transmission delay is large caused by the difficulty of efficient pretreatment of multi-source signals of industrial equipment at edge side.

This invention relates to the fields of optical 3D measurement and machine vision technology, and discloses a method, system, computer-readable storage medium, and computer program product for suppressing high reflectivity in structured light. The method includes: calculating the wrapping phase information of a multi-line coded phase shift map using a phase-shifting algorithm; constructing a Gray code coded image of the object under test; binarizing the Gray code coded image using an inverse Gray code image complementary to the Gray code coded image, and then correcting erroneous codewords using connected component analysis; calculating the corresponding phase order information based on the Gray code binarization result corrected by connected component analysis; and obtaining the unfolded absolute phase distribution map using the wrapping phase information and the phase order information. Based on the above suppression strategy, this invention improves the accuracy and robustness of Gray code decoding in high-reflectivity scenarios for structured light systems, thereby enhancing the integrity of 3D imaging.