182 results about "Gray code" patented technology

The invention discloses an online monitoring method and system for the light transmittance of an optical lens, and relates to the technical field of precise optical detection. The objective of the invention is to solve the problem of large light transmittance calculation error caused by halo scattering noise interference, low optical path calibration precision of a complex curved lens, a measurement blind area of a large-aperture lens and environmental disturbance of a high-reflection / high-light-transmittance lens in the prior art. According to the scheme, a three-dimensional curved surface model is constructed based on Gray code structured light projection and ICP registration, a dynamic partition scanning instruction set is generated through an improved genetic algorithm, and multi-wavelength polarized light is driven to scan and collect multi-dimensional data; specular reflection and scattering noise are suppressed by combining an improved Stokes vector algorithm and an attention mechanism U-Net network, and the data precision of the complex curved surface is improved by adopting Bayesian optimization and Zernike polynomial weighted fusion; constructing a double-loop coupling optimization architecture to realize closed-loop adaptive optimization; according to the invention, the anti-interference capability, the complex lens adaptability and the full-aperture detection precision are obviously improved.

The invention discloses a fringe projection three-dimensional shape measurement method based on frequency domain and time domain joint coding, and the method comprises the following steps: firstly, embedding a multi-frequency three-step phase shift fringe pattern in the vertical direction based on multi-scale region division, introducing four-step phase shift and complementary Gray code joint coding in the horizontal direction, generating a coding pattern set, and carrying out the projection; after an image is collected, frequency domain transformation and time domain decoding are carried out respectively, and a vertical dominant frequency position, a horizontal period number and a wrapped phase are obtained; then, combining a main frequency position in the vertical direction with a period number and a wrapped phase in the horizontal direction, and extracting a space coordinate of a direct illumination component based on frequency position invariance; and finally, establishing a pixel homonymy point mapping relation between the projector and the camera, and realizing high-precision three-dimensional reconstruction. Compared with a traditional frequency shift method, the method has the advantages that projection patterns are greatly reduced, reconstruction precision and anti-interference performance are improved, and the method is suitable for dynamic three-dimensional measurement under complex illumination conditions such as specular reflection, semitransparent shielding and subsurface scattering.

The invention discloses a three-coordinate structured light splicing method and system, and relates to the field of image processing, and the system comprises an acquisition module which is used for projecting a composite coding pattern through a structured light projection device, collecting workpiece surface deformation stripe images from preset multiple angles in cooperation with an industrial camera, and synchronously obtaining point cloud data under a structured light coordinate system, covering the whole surface features of the workpiece; according to the method, a composite coding pattern formed by combining a Gray code and a phase shift stripe is adopted, and self-adaptive exposure control and curvature-based path planning are combined, so that high-precision acquisition of complex curved surface details is realized, the phase calculation precision reaches a sub-pixel level, the scanning step length is dynamically adjusted according to the curvature of the curved surface, and the acquisition precision of a complex region is effectively improved.

The invention relates to the technical field of data transmission processing, and provides an unmanned aerial vehicle communication-assisted ecological monitoring data transmission system and method, and the method comprises the steps: obtaining the ecological monitoring state parameters of an unmanned aerial vehicle; calculating an ecological monitoring obstruction coefficient and a dynamic disturbance coefficient of the unmanned aerial vehicle; calculating unmanned aerial vehicle cooperative interference loss weights, obtaining an ecological monitoring unmanned aerial vehicle transmission topological graph by using the unmanned aerial vehicle cooperative interference loss weights, recording unmanned aerial vehicle cooperative interference loss weight values with a preset time slot length as a cooperative interference loss weight sequence, calculating an adaptive interval adjustment length, and calculating a node screening threshold value; acquiring an ecological monitoring transmission bearing topological graph; and calculating a Gray code adaptive bit variation value of the ecological monitoring unmanned aerial vehicle, and performing transmission adjustment on transmission data of the ecological monitoring unmanned aerial vehicle by using the Gray code adaptive bit variation value of the ecological monitoring unmanned aerial vehicle. The reliability of the ecological monitoring unmanned aerial vehicle in the data transmission process is ensured.

The invention discloses a semantic segmentation method based on phase contour constraint, and belongs to the technical field of computer vision. The method comprises the following steps of: acquiring a two-dimensional texture image and a deformed stripe image of a scene to be detected in the same view field by using a calibrated camera-projector system; resolving the deformed fringe image through a multi-step phase shift and Gray code technology to obtain absolute phase distribution, and calculating a gradient field; according to a preset sudden change condition, extracting a physical edge contour reflecting the depth change of the object from the gradient field; and mapping the physical edge contour into the two-dimensional texture image based on a pixel coordinate corresponding relation to accurately define a semantic object region, endowing a corresponding category label, and finally generating a semantic label mask image. According to the method, the uncertainty of the visual texture edge is corrected by utilizing the physical phase information, the problem of edge extraction in a complex illumination scene is effectively solved, automatic generation of semantic segmentation data is realized, and the training precision and robustness of a semantic segmentation model are improved.

The invention discloses a phase deflection measurement method and device based on four-step phase shift, and belongs to the technical field of computer vision and precision measurement, and the method comprises the steps: S1, classifying patterns needing to be projected according to types, and fusing the patterns into a color image; s2, sequentially projecting color images, and simultaneously collecting a pattern modulated and reflected by an object to be measured to obtain a reflection pattern; s3, carrying out channel separation processing on the reflection pattern, recovering the reflection pattern into an original grey-scale map, and respectively obtaining all phase patterns and Gray code patterns in the horizontal direction and the vertical direction; s4, performing phase calculation and Gray code auxiliary positioning according to the phase pattern and the Gray code pattern to obtain an absolute phase; and S5, mapping the absolute phase into a depth value, and recovering the three-dimensional shape of the surface of the object to be measured in combination with calibration parameters of a camera-projection system. The time of each measurement period is shortened, the system delay in the projection and acquisition process is reduced, and the real-time response capability of the whole set of detection system is improved.

The invention discloses an underwater high-speed three-dimensional measurement method based on stripe structured light, and relates to the technical field of underwater optical three-dimensional imaging, in an underwater operation scene of an FPP system, projecting a three-step phase shift sine stripe and a Gray code pattern to an object to be measured, and respectively calculating a wrapped phase 1, a wrapped phase 2 and an auxiliary order phase; analyzing the light intensity information received by the camera, and carrying out water body influence analysis in combination with an underwater light transmission model; the initial wrapped phase divides the order phase into a stable region and a non-stable region, the stable region is combined with the wrapped phase 1 to calculate a preliminary absolute phase, and the non-stable region is combined with the wrapped phase 2 to calculate an absolute phase through an island processing method. According to the method, a phase bisection complementary decoding strategy is adopted, a jump error region in an order phase is effectively identified and corrected by constructing complementary wrapped phase information, a wrong order phase is corrected by using a noise correction algorithm, and the measurement stability in a dynamic scene is remarkably improved.

The invention discloses a digital grating projection three-dimensional reconstruction method in a mutual reflection environment, and the method comprises the steps: determining a first frequency and a second frequency of a phase shift image and a Gray code image marking a stripe period, generating a first group of multi-step phase shift images and a second group of multi-step phase shift images, and projecting the images to the surface of an object; capturing a fringe image reflected and modulated by the surface of the object, acquiring a first wrapping phase based on the first group of multi-step phase shift images, acquiring a second wrapping phase based on the second group of multi-step phase shift images, and judging whether two wrapping phases of pixels at the same position accord with the wrapping phase relationship determined by the two frequencies; if not, determining that the pixel at the position has phase interference and filtering the phase interference; and obtaining an absolute phase based on the wrapping phase of the residual position pixels and the fringe periodicity determined by the Gray code image, and calculating the height of the object by combining the calibrated phase and height conversion model to generate an object point cloud. According to the invention, wrong phases caused by mutual reflection can be effectively removed.

The invention discloses an optical Gray code encoder temperature compensation method and system based on an NTC resistance network, and the method comprises the steps: calibrating a PD signal drift law in a working temperature range, designing an NTC voltage division circuit matched with the law, and integrating the NTC voltage division circuit to a comparator, thereby achieving the real-time offset of the PD signal temperature drift. According to the scheme, the defects that in the prior art, complexity is high and cost is high are overcome, compensation precision within + / -0.5% is achieved only through basic electronic elements, the response speed reaches the microsecond level, cost is reduced by 60% or above, the method is suitable for wide-temperature-range scenes ranging from-40 DEG C to 85 DEG C, and a low-cost and high-precision temperature compensation solution is provided for precise measurement of high-end equipment.

The invention relates to a structured light-assisted binocular stereo matching fusion method, system and device and a medium. The method comprises the following steps: projecting a plurality of groups of high-frequency sine stripes to the surface of a target object, and superimposing and projecting a Gray code pattern; shooting the surface of the target object to obtain left and right images; and extracting a wrapped phase from the left and right images, and calculating to obtain an absolute phase according to the wrapped phase and the decoded information of the Gray code pattern. And calculating the matching cost of each pixel in the left image and the right image under different parallax, and carrying out cost aggregation processing in a parallax space by taking an absolute phase as a constraint to obtain a parallax map. And optimizing the disparity map to obtain the optimal disparity. And generating a three-dimensional point cloud according to the optimal parallax and the calibration parameters. According to the method, texture information can be enhanced, and the reconstruction integrity and geometric accuracy of weak-texture and high-reflection non-abandoned products are remarkably improved.

The invention discloses a multifunctional data acquisition and transmission system based on PXIe, and belongs to the technical field of high-speed data acquisition and real-time transmission. The system comprises a data acquisition module, an analog output module, a PXIe data transmission module and a high-speed board-to-board connector, the data acquisition module acquires analog signals through an A / D conversion unit, and after cross-clock domain synchronization and rate matching are achieved through an asynchronous double-clock FIFO cache unit, the analog signals are packaged by an FPGA control unit and transmitted to an upper computer at a high speed through a DMA engine of a PXIe interface; the analog output module receives instructions of an upper computer through the FPGA, digital signals are buffered through asynchronous FIFO, analog signals are output through the D / A conversion unit, and a two-way data link is formed. The innovative design of the method comprises the following steps of: eliminating a metastable state risk by adopting asynchronous FIFO (First In First Out) synchronized by a Gray code pointer, triggering a pause / recovery signal through a threshold value in combination with an FPGA (Field Programmable Gate Array) dynamic flow control strategy to prevent data overflow or cut-off, and optimizing a PXIe DMA engine to realize high-speed transmission so as to reduce a CPU (Central Processing Unit) load. The system can be used in the fields of industrial automatic testing, high-precision instruments and real-time signal processing.

A method of reducing jitter in transmission of a timestamp across a clock domain boundary includes storing N timestamps, generated in N successive clock cycles of an origin clock domain, in N parallel buffers in the origin clock domain under control of a modulo-N counter, transmitting outputs of the N parallel buffers across the clock domain boundary into a destination clock domain along with the modulo-N counter, processing the modulo-N counter in the destination clock domain to derive a selection signal that selects a stable timestamp from among the outputs of the N parallel buffers, and outputting the selected stable timestamp. The modulo-N counter may be Gray-coded modulo-N counter to reduce jitter in the modulo-N counter across the clock domain boundary.

A face identification system, and a non-transitory computer readable medium with instructions, that when executed, perform a method for identifying a face image are described. The face identification system comprises a camera for facial image capture, encryption circuitry for image encryption, feature extraction circuitry for processing encrypted images, a face recognition system for identification, and an identification notifying system for result transmission. The encryption circuitry includes a pixel-bit converter, transforming pixel intensities into binary digits, and a 2D cellular automata function, working with a 3×3 matrix of binary-state cells transitioning by update rules. A gray code generator maps binary numbers to unique gray-scale values. The system integrates advanced encryption techniques with efficient feature extraction and recognition algorithms, addressing challenges in biometric authentication. This approach enhances security, accuracy, and computational efficiency compared to conventional systems, making it suitable for various applications requiring secure and efficient facial recognition.

The invention relates to a fringe projection high-reflection surface phase unwrapping method based on frequency reuse. The fringe projection high-reflection surface phase unwrapping method comprises the steps of collecting a multi-frequency fringe image and dividing the multi-frequency fringe image into an overexposure area and a non-overexposure area, solving a wrapped phase in the non-overexposure area by adopting a generalized phase shift method, obtaining an initial unwrapping phase based on a multi-frequency heterodyne algorithm, and performing block filtering and interpolation processing to obtain a fringe projection high-reflection surface phase unwrapping phase. A continuous unwrapped phase containing a high-reflection area is obtained, a complementary Gray code consistent with a wrapped phase period is constructed in combination with a multi-threshold constraint and is used for correcting the stripe level of an overexposure area, brightness attenuation design is further carried out on low and medium frequency stripes, frequency reuse is achieved, and the high-reflection area is obtained. Obtaining an unwrapped phase of an overexposure point in a non-high-frequency stripe and mapping the unwrapped phase to a high frequency; the method comprises the following steps of: extracting and fusing a wrapped phase by adopting one-dimensional Fourier and Hilbert transform for areas with overexposure of each frequency, and selecting and inhibiting spectrum leakage through a complete period, so that effective correction of the wrapped phase and stripe level of an overexposure point is realized, and a reliable unwrapped phase is obtained.

The invention relates to the technical field of fringe projection three-dimensional reconstruction, in particular to a point cloud enhancement method and system based on polarization structure perception and trend guided recovery. The method comprises the following steps: acquiring a multi-angle polarization image, and generating an object area mask based on a polarization angle consistency mask, a polarization angle gradient mask and a linear polarization degree mask; obtaining an original phase diagram through four-step phase shift and complementary Gray codes, obtaining a missing region in an object according to hole distribution of the original phase diagram, and adding morphological structure indexes and local variance features to recognize a real self-shadow region; aiming at the identified real self-shadow area, establishing a structure guiding recovery model combining a first-order structure gradient guiding item and a second-order structure gradient guiding item to obtain a complete object point cloud; and separating a background and an invalid shadow in the object point cloud through the object area mask to obtain a point cloud which only retains the object area.

The invention provides an edge side industrial data lightweight preprocessing caching method, and belongs to the technical field of industrial data. According to the method, the data acquisition quality is improved through Gray code anti-interference coding, dynamic sampling is realized through adaptive sampling rate adjustment and weak abnormal feature weight vectors, a fault position is accurately positioned through wavelet decomposition and a high-frequency fault feature sparse matrix, a semantic perception compression encoder is matched with a dispersion evaluation matrix to carry out differential coding, and the accuracy and the reliability of the algorithm are improved. According to the overall systematic technical scheme, the transmission path is optimized through a network transmission graph model, and all links from signal acquisition, self-adaptive processing, intelligent compression, dynamic cache management to network optimization are optimized. The technical problems that the cache occupancy rate is too high and the data transmission delay is large due to the fact that the multi-source signals of the industrial equipment are difficult to pre-process efficiently on the edge side are solved.

The invention provides an OTFS-based secret key generation method and system, and relates to the field of physical layer security, and the method comprises the steps that based on multiple rounds of channel detection between a master node and a slave node, the two nodes respectively execute the following operations by using respective received signals: based on the received signals, channel estimation is performed, and by using a channel estimation result, a secret key is generated; estimating a channel state information vector of the delay Doppler domain; performing decorrelation transformation on the estimated channel state information vector; and mapping the channel state information vector subjected to decorrelation transformation into a corresponding quantization interval, dynamically generating a coding index by adopting a self-adaptive index adjustment mechanism according to an index of the quantization interval, extracting high-order bits from a Gray code corresponding to the coding index, and generating a local shared key. According to the method, OTFS modulation and demodulation are used for physical layer key generation, autocorrelation caused by OTFS is solved through decorrelation transformation, and the efficiency, robustness and consistency of key generation in a mobile communication scene are improved.

The invention discloses a color Gray code coding auxiliary phase unwrapping method and an applied three-dimensional imaging method and system, and belongs to the technical field of three-dimensional imaging. The method comprises the following steps: constructing two groups of colored sine stripe patterns with different frequencies, projecting a scene to be detected, and capturing the two groups of stripe patterns; converting the stripe pattern from an RGB format into an HSV format, extracting a hue channel and performing Gray code decoding; extracting a hue channel from the RGB-format fringes to perform intensity normalization processing, then filling the hue channel into a single-channel image, calculating a wrapped phase by using a phase shift formula, then calculating heterodyne phases of fringe patterns with different frequencies through a multi-frequency heterodyne method, and performing first unwrapping on the wrapped phase; and unfolding the phase diagram which is unfolded for the first time in an auxiliary manner by utilizing a Gray code decoding order, thereby obtaining a final absolute phase. Gray codes are coded and embedded into different channels of two groups of patterns, so that the number of required patterns is remarkably reduced, and the measurement efficiency is effectively improved.

The invention discloses a novel method for measuring the surface shape of a large-aperture film mirror surface, and the method comprises the steps: obtaining a reflected deformed fringe image based on a four-step phase shift method, and obtaining the wrapped phase distribution of the image after modulation; performing labeling processing on the level of the wrapped phase distribution by using a Gray code to obtain unpacked phase distribution; a camera is used for collecting a film mirror image, center coordinate and radius labeling is carried out on the image, center coordinate symmetry operation is carried out on unpacking phase distribution, and phase change is obtained; obtaining the relation between the phase change and the gradient, obtaining the coefficient matrix of the first 36 constant terms of the zernike polynomial by using the least square method, further obtaining the surface shape data of the thin film mirror surface, and outputting the current surface shape data of the thin film mirror surface when the difference value of the current and later surface shape data of the thin film mirror surface reaches a convergence threshold value, thereby completing the measurement of the surface shape of the thin film mirror surface. According to the invention, the problems of large stripe deformation and discontinuous phase caused by overlarge mirror gradient are solved, and the limitation of film mirror measurement is solved.

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.

The present invention provides a column-level readout circuit and an infrared imager, which relate to the field of integrated circuits. A transconductance module generates a first current and a second current and respectively outputs them to a first current-controlled oscillator and a second current-controlled oscillator; the first current-controlled oscillator receives the first current to generate a first pulse output and transmits it to a first Gray code counting unit; the first Gray code counting unit performs an operation on the first pulse output to obtain a first counting result and transmits it to a first self-calibration unit; a first phase sampling unit samples the phase of each stage of the ring oscillator to obtain first phase information and transmits it to the first self-calibration unit; the first self-calibration unit calibrates the first counting result based on the first phase information to obtain a first accurate code value and transmits it to a difference unit; the difference unit subtracts the second accurate code value from the first accurate code value to obtain a quantization result and outputs it outside the chip. The column-level readout circuit of the present invention has low power consumption, small occupied area, good monotonicity, high signal-to-noise ratio, and has high practicability.

The invention provides a metal part surface defect detection method and device, electronic equipment and a storage medium, the defect detection method comprises the following steps: projecting a Gray code pattern and a sine stripe pattern to a to-be-detected surface of a metal part, and using a 3D camera to shoot a to-be-detected image containing the to-be-detected surface; obtaining an enhanced gradient magnitude image based on the to-be-detected image, and obtaining an enhanced absolute phase image based on the to-be-detected image; and splicing the enhanced gradient magnitude image and the enhanced absolute phase image to obtain a dual-channel image, inputting the dual-channel image into a trained CNN model, and obtaining a defect type output by the CNN model. The defect detection method can detect the defects on the surface of the metal piece.

The application discloses a phase solving method based on sequence pixel extreme value positioning, relates to the fields of computer vision and optical measurement, and comprises the following steps: designing M line shift or phase shift fringe patterns and N complementary gray code patterns, projecting the patterns to an object to be measured in sequence, collecting images of the object to be measured under different fringe patterns, and obtaining M line shift fringe images or phase shift fringe images and N complementary gray code images; performing phase calculation on the collected M line shift fringe images or phase shift fringe images, and obtaining a wrapped phase image; decoding the collected first N-1 gray codes to obtain K1 orders, and decoding all the N gray codes to obtain K2 orders; combining the wrapped phase image and the multiple gray code projection images to perform phase unwrapping, and obtaining a phase unwrapping image; and through the innovative extreme value positioning and adaptive exposure processing mechanism, the accuracy, the robustness and the reliability of the phase solving are effectively improved, and the problem that the measurement effect of the prior art is poor in a complex environment is solved.

The invention provides a plano-convex lens curvature radius detection method and system based on structured light reconstruction and sub-pixel fitting and a medium, and the method comprises the steps: collecting a multi-angle calibration plate image based on a camera, and calibrating camera parameters; acquiring a coded image based on the projector, and calibrating parameters of the projector; projecting a Gray code pattern based on the calibrated projector, and acquiring a coding graph sequence based on the calibrated camera to obtain three-dimensional point cloud data; analyzing the three-dimensional point cloud data based on an edge detection operator, extracting edge features of the convex surface region, and performing sub-pixel fitting on the edge features of the convex surface region based on a curved surface interpolation algorithm to obtain plano-convex lens contour information; the method comprises the following steps: constructing a spherical surface model, fitting the spherical surface model according to a least square method, calculating a curvature radius result of a convex surface area based on the optimized spherical surface model, realizing non-contact detection through cooperation of a camera and a projector, avoiding pollution or damage of an optical surface, and improving detection precision and efficiency.

The utility model discloses a bridge rotation angle automatic measurement coding ruler which comprises a coding ruler body, a rotation angle scale area arranged above the coding ruler, a Gray code area arranged below the coding ruler and a photoelectric reading instrument. The coded ruler body is made of stainless steel strips. The coding ruler body is suspended on a bridge turntable, and the coding ruler body is driven to rotate synchronously when a bridge rotates horizontally; the photoelectric reading instrument is U-shaped and is fixedly arranged on a bridge bearing platform; when the coded ruler body rotates, the coded ruler body and the photoelectric reading instrument generate relative displacement; the Gray code area below the coding ruler body is embedded into a U-shaped opening of the photoelectric reading instrument, the photoelectric reading instrument recognizes the Gray code, and the rotation angle of the bridge is determined according to the Gray code. According to the utility model, the measurement efficiency can be obviously improved, automatic measurement is realized, and the measurement result precision is high.

The present disclosure relates to image signal and phase detection autofocus signal extraction and storage in an arithmetic logic unit. An arithmetic logic unit (ALU) includes a front end latch stage coupled to a signal latch stage coupled to a Gray code (GC) to binary stage. A first input of an adder stage is coupled to receive an output of the GC to binary stage. An adder input latch stage includes first and second adder input latches including first and second inputs coupled to receive the output of the GC to binary stage. An adder input multiplexer stage includes an output coupled to a second input of the adder stage and first and second inputs coupled to outputs of the first and second adder input latches, respectively.

The invention provides a spatial light modulation method and system for Gray code coding rearrangement, and relates to the technical field of computational imaging and spatial light modulation. According to the method, a Gray code sequence and a high-performance basic modulation matrix are combined, a basic modulation matrix is constructed according to a target image resolution ratio and a sampling rate, a Gray code index sequence with only one different adjacent indexes is generated, a measurement matrix is obtained by rearranging the matrix through a mapping function, and the measurement matrix is loaded to a spatial light modulator to code a light signal; and the double-path detector collects transmitted and reflected light intensity response and performs differential processing, and inputs a compressed sensing reconstruction algorithm to restore an image. According to the invention, stable and efficient information capture at a low sampling rate is realized, the anti-interference capability and repeatability of the system are improved, the hardware compatibility is strong, the implementation cost is low, and the method is suitable for the fields of single-pixel imaging, three-dimensional measurement and the like.

The invention discloses a power distribution network topological structure identification method, device and equipment based on a genetic algorithm and a medium, and belongs to the field of electric power systems.The method comprises the steps that first user monitoring terminal power data of all user monitoring terminals in a power distribution network and first transformer power data of all transformers in the power distribution network are obtained; establishing a mathematical model containing constraint conditions and an objective function represented by an L2 norm according to the topological structure of the power distribution network; and performing binary Gray code coding on the topological matrix to be solved by adopting a genetic algorithm, iteratively updating a population through operations such as fitness calculation, selection, crossover and variation until an optimal individual meets a requirement or reaches a preset number of iterations, outputting the optimal individual and determining the topological structure of the power distribution network. Therefore, through the implementation of the method, the problems that in the prior art, due to dependence on an additional device, economical efficiency is low, a convex optimization approximate solution result is different from the actual situation, and local optimum is likely to happen can be solved.

A gray code is controlled suitably for a range.A distance measuring device includes one or a plurality of light emitting elements, a plurality of light receiving elements, a first counter, an encoder, a decoder, a second counter, and a distance extraction circuit. The plurality of light receiving elements receives light from the one or the plurality of light emitting elements reflected on a target. The first counter is a binary code of n digits from a first value to a second value of 2n−1−(the first value), and performs, at every predetermined time, state transition of a first binary code in which a value next to the second value is set as the first value. The encoder converts the first binary code into a gray code of n digits. The decoder acquires the second binary code of n digits from the gray code based on a light reception timing of the light receiving elements. The second counter counts the number of times of light reception in the plurality of light receiving elements corresponding to each of the second binary codes. The distance extraction circuit measures a distance to the target on the basis of a discrete value acquired by the second counter.