189results about How to "Improve decoding success rate" patented technology

The invention provides a one-dimensional barcode decoding chip which comprises a scanning module, a border identification module, a direction identification module, a bar empty border processing module, a symbol parameter identification module, a symbol and character acquisition module and a decoding module; the scanning module produces scanning coordinates; the border identification module reaches barcode images according to the scanning coordinates and calculates the read image pixels so as to acquire the bar empty border points of the barcode images; the direction identification module calculates and obtains barcode directions according to the bar empty border points acquired by the border identification module; the bar empty border processing module processes the barcode images according to the barcode directions, so as to acquire the bar empty borders in the barcode images; the symbol parameter identification module calculates and acquires symbols and characters according to the bar empty and symbol parameters; and the decoding module converts the symbols and the characters into barcode information. The one-dimensional barcode decoding chip adopts a hardware assembly line structure, is applicable to the assembly line operation and parallel processing of the barcode images, and has high processing speed.

The invention provides a light supplementing method in two-dimensional code scanning and a system thereof. The light supplementing method comprises the steps of S1, starting a camera, recording the current on/off state of a light supplementing lamp; S2, acquiring data of a two-dimensional code image and storing by a processor through the camera; and S3, decoding the two-dimensional code image by the processor, and if decoding fails, changing the on/off state of the light supplementing lamp by the processor, and turning to the step S3 for resuming execution. The system comprises the camera, the light supplementing lamp and the processor. The processor comprises a first recording module, an acquiring module, a storing module, a decoding module and a control module. The camera and the light supplementing lamp are connected with the processor. Through automatically adjusting the on/off state of the light supplementing lamp by the processor, a requirement for determining whether the light supplementing lamp is required according to different environments in which the two-dimensional code is arranged is satisfied. The light supplementing method in two-dimensional code scanning and the system further have advantages of high environment adaptability and flexible and convenient operation.

The present invention provides a distortion image correction based two-dimensional code decoding method and a system. The method comprises: acquiring a frame of image that contains a two-dimensional code, and judging the type of the two-dimensional code by determining a plurality of feature points of the two-dimensional code; calling a corresponding matching template according to the type of the two-dimensional code; performing correction by using perspective transformation first, wherein the computation amount of the perspective transformation is small and a quadrilateral pattern with relatively low distortion degree can be realized; filling the matching template with a gray-scale value of each pixel point, wherein rapid decoding is realized by the matching template; if the decoding is failed, then performing correction by starting a curved surface correction algorithm that is relatively complicated and more accurate in correction precision, wherein the curved surface correction can correct a pattern with relatively high distortion degree; performing the perspective transformation on the two-dimensional code pattern subjected to the curved surface correction again for correction. After the curved surface correction, a pattern approximate to a regular quadrangle is obtained and the perspective transformation is performed again, so that the success rate of decoding can be greatly increased.

The invention relates to a personnel and vehicle target classification system and method. The method comprises the following steps: (1) conducting physical partition on video according to setting byte amount to obtain a plurality of video blocks; (2) saving the partitioned video blocks at different child nodes in sequence; (3) conducting logic slicing on a video block according to the key frame of each video block to obtain a plurality of video slices; (4) analyzing each video slice to obtain a key value pair of the video slice; (5) conducting personnel and vehicle classification on the video slices according to the key value pairs obtained from analysis to obtain personnel target information and vehicle target information; (6) saving the personnel target information and the vehicle target information after classification in different catalogs respectively. Compared with the prior art, the method is easy to operate, efficient in processing, and effective in unziping.

The invention discloses a decoding method and system for a distorted QR (Quick Response) code. A frame of image with the QR code is obtained, and the version of the QR code is judged by determining a plurality of feature points of the QR code. A corresponding matched template is called according to the version of the QR code. Correction is implemented by adopting a curved surface correction algorithm with higher correcting precision. A pattern with relatively high distortion degree can be corrected by the curved surface correction. The QR code pattern subjected to the curved surface correction is subjected to perspective transformation for correction. A pattern approximate to a regular quadrangle can be obtained through the curved surface correction, and then the pattern is subjected to the perspective transformation, so that the success rate of decoding can be greatly increased.

The embodiment of the invention provides a control information transmitting method and device and a control information receiving method and device. Resource fragmentation can be reduced and the transmission performance can be enhanced. The method comprises the steps that first equipment transmits first control information to second equipment, wherein the first control information includes the information of a first time frequency resource, the first time frequency resource at least bears the first data, and the first data include the first bit obtained by channel coding of the first information block; and the first equipment transmits second control information to the second equipment, wherein the second control information includes the information of a second time frequency resource, thesecond time frequency resource at least bears the second data, the second data include the second bit obtained by channel coding of the first information block, the second time frequency resource ispositioned in the preconfigured first resource area, the first resource area is used for bearing the first business and is not used for bearing the second business, and the first data and the second data belong to the data of the first business.

The invention discloses a coder, a decoder, a coding method and a decoding method lowering flash bit error rate, belonging to the technical field of flash chip compilation. When the coder writes data,the coder determines whether a half of ''1'' are in written hot data, if yes, the coder inverts hot data and then writes in flash; and the coder determines whether a half of ''1'' in high page data or a half of ''0'' in low page data are in written cold data, if yes, the coder inverts the cold data and then writes in flash. When the decoder reads data, the decoder analyzes an inversion state of the read data, if a half of ''1'' exists in the inversion state, the decoder inverts the read data and then outputs, if not, the decoder directly outputs read data. The invention realizes the coding method and decoding method lowering flash bit error rate. Through adoption of the coder, the decoder, the coding method and decoding method, the error probability of data in flash is lowered, the original bit error rate is lowered, more accurate input is provided for existing correction code solutions, the decoding success rate is improved, so that the flash reliability is further improved.

The invention discloses a hybrid automatic repeat request method and base station equipment, which aims at solving the problems of low terminal packet decoding success rate and low system spectrum efficiency in the HARQ process under the condition that the base station does not receive any feedback information that is sent by the terminal and is about whether the HARQ packet is received successfully or not. The method of the invention comprises: the base station utilizes downlink resources assigned for the terminal and adopts an HARQ mode to send a first sub-packet of an HARQ packet; and if the base station does not receive any feedback information which is sent by the terminal and is about whether the HARQ packet is received successfully or not within a set time period, the base station assigns new downlink resources for the terminal and utilizes the newly assigned downlink resources to transmit the first sub-packet of the HARQ packet to the terminal again.

The invention discloses a method and a system for detecting and positioning a two-dimensional code area. During positioning, a gray level image of a to-be-identified two-dimensional code is obtained;downsampling is carried out on the grayscale image; carrying out edge detection on the down-sampled image; and performing binarization processing on the image after edge detection, performing expansion and corrosion processing on the image after binarization to obtain a plurality of connected regions, performing two-dimensional code feature analysis on each connected region, screening out candidate regions of the two-dimensional code, and taking the region of the grayscale image corresponding to the obtained candidate regions as a to-be-decoded region. Through the steps of gray processing, downsampling, edge detection, binarization processing, expansion, corrosion, screening and the like on the image, a plurality of two-dimensional codes are detected and positioned from a complex graph with a plurality of two-dimensional codes, and the problems of two-dimensional code bull eye combination errors and low decoding success rate are avoided.

The invention discloses a method for optimizing a pre-decoding set in luby transform (LT) codes. The method comprises the following steps that: a sending terminal performs replacement treatment on an originally input coding group of a coding group of which the degree is 2 in front K coding groups generated by the LT codes and transmits the originally input coding groups, wherein k is the number of the selected coding groups; and decoding is carried out at a receiving terminal, if all originally input coding groups are decoded, the decoding is ended, or the receiving terminal performs an exclusive-or treatment on the two decoding groups which cannot be decoded and assigns a value to the next coding group, and the decoding continues till the end. The invention also discloses a system for optimizing the pre-decoding set in the LT codes. The method and system can make the size of the pre-decoding set more stable during the decoding and provide a bigger pre-decoding set.

The invention discloses a data bit extracting method of a mode S answering signal in an ADS-B (automatic dependent surveillance-broadcast) system. The method comprises a Gaussian noise power predicating step, a data bit division step, a data bit quality judging and high-quality data bit extraction step, a common-frequency interference maximum power calculation step, a low-quality data bit extraction step and a CRC error correction step. The data bit extracting method has the advantage that the anti-interference and high-fault-tolerance data bit extraction of the mode S answering signal of the ADS-B system is realized.

The invention provides a PDF417 bar code decoding chip which comprises a scanning module, a boundary identification module, a direction identification module, a bar space boundary processing module, a symbolic parameter identification module, a sign character acquisition module and a decoding module, wherein the scanning module is used for generating scanning coordinates; the boundary identification module is used for reading a bar code image according to the scanning coordinates and calculating pixel points of the read image so as to acquire bar space boundary points of the bar code image; the direction identification module is used for calculating a bar code direction according to the bar space boundary points acquired by the boundary identification module; the bar space processing module is used for processing the bar code image according to the bar code direction so as to acquire a bar space boundary of the bar code image; the symbolic parameter identification module is used for identifying the symbolic parameter of a bar code according to the bar space boundary so as to acquire the symbolic parameter; the sign character acquisition module is used for calculating according to the bar space boundary and the symbolic parameter to obtain a sign character; and the decoding module is used for converting the sign character into bar code information. The PDF417 bar code decoding chip adopts a hardware pipeline structure, is suitable for carrying out pipeline operations and parallel processing on bar code images and has high processing speed.

The present invention provides an improved self-defined model three-dimensional two-dimensional code generation method and system facing 3D printing. The method comprises: performing meshing and normalization processing of a self-defined model; employing the perspective projection transformation method to map two-dimensional codes to the target area of the self-defined model; performing hollowing operation according to a mapping result, and generating three-dimensional two-dimensional codes with the same hollowing depth at the surface of the self-defined 3D model; simulating a real two-dimensional code image through a physical experiment, and calculating the whole contrast of the three-dimensional two-dimensional codes and the contrast of each black module; optimizing the depth of the three-dimensional two-dimensional code block module according to the simulation result, and generating the three-dimensional two-dimensional codes; inputting the generated 3D model comprising the three-dimensional two-dimensional codes into a 3D printer, employing homogenous materials for printing, and finally outputting a 3D real object with the three-dimensional two-dimensional codes.

The invention discloses a fountain code encoding method based on satellite communication. The method comprises the following steps of A): segmenting a sent file to form a plurality of original information groups; B): carrying out fountain code encoding on the original information groups so as to form coded groups; C): transmitting the coded groups to a receiving end through a satellite link, and performing fountain code decoding after the receiving end receives sufficient data packets; D): if all the original information groups cannot be recovered, feeding back data block numbers needing to beretransmitted and a quality condition of the satellite link to a sending end; if all the original information groups are recovered, not starting a feedback mechanism; and E): if the sending end receives feedback information, according to the quality condition of the satellite link, adjusting fountain code encoding parameters dynamically in real time, and starting a retransmission mechanism. The method has the advantages that the encoding redundancy overhead is effectively reduced, repeated feedback and retransmission are avoided, and the problems that the error rate is high, the transmissiontime delay is long and the like in satellite communication are solved in a targeted mode.

The invention relates to the technical field of RFID radio frequency, and mainly relates to a label signal decoding method, a label decoding device and a label reader. The label signal decoding methodcomprises a data sampling step, a frame header detection steps and a data decoding step. In the frame head detection step, a matching degree of a frame head template sequence and a label data signalsequence is measured by using related coefficients, and a frame header is accurately found in a waveform comparison mode; in the data decoding step, data sequences within a bit period are extracted according to a sampling multiplier N and a level skip condition of a data part, and the problem of decoding failure caused by frequency offset of a certain degree can be processed; and the computation amount of determining the data bit according to an accumulated value is small, the judgment result is reliable, and certain fault tolerance is available.

The invention discloses an Internet-of-vehicle long distance data communication relay agent method based on a fountain code. The method comprises steps that S1, the fountain code is utilized by a sending end vehicle node to code sending-needing data; S2, a fountain code message is forwarded by a relay node, and a road side unit (RSU) is taken as an agent for fountain coding; S3, foundation coding of the message after successful coding is carried out for another time by an agent node; and S4, a foundation coding message is received by a reception end vehicle node, and foundation coding is further carried out. The method is advantaged in that the coding process is simplified, a coding success rate is further improved, expected forwarding frequency of data transmission is further improved, and data transmission efficiency is improved.

The present invention provides a data transmission method and device. The method comprises: a sending terminal performs redundancy encoding of data in a data set to be sent at present according to the redundancy encoding parameters corresponding to the data set to be sent at present; and the sending terminal sends the data in the data set to be sent at present after redundancy encoding to a receiving terminal. The data transmission method and device can reduce the packet loss probability of the sending terminal sending data to the receiving terminal, reduce the probability of repeatedly sending data to the receiving terminal and improve the data sending speed.

The invention relates to a two-dimensional code decoding method and a terminal, and belongs to the field of data processing. The method comprises the steps of by obtaining a grayscale image of a two-dimensional code, obtaining a gray histogram corresponding to the gray image; Counting a half of the total number of pixels of the grayscale image to obtain a target number; Obtaining a gray thresholdvalue according to a preset formula; Wherein the preset formula is specifically shown in the description; Wherein histGram [i] represents the number of pixels with the gray value of i in the gray histogram, S represents the target number, dif (t) represents the difference between the number of pixels with the gray value of not more than t and the target number, and T represents the gray threshold;Binarizing the gray level image according to the gray level threshold value to obtain a binarized image; And calling a bar code decoding algorithm, and trying to decode the binary image. The two-dimensional code decoding success rate of non-uniform ink jet is improved.

The invention discloses a one-dimensional bar code word decoding method based on the least square method, and the method comprises the following specific steps: calculating the number ei of modules in a similar edge distance of each code word of a bar code according to an actually scanned bar vacancy width, comparing the number ei of modules with the number Ei of module widths in an accurate code word in a standard edge difference table, judging whether the number ei of modules is equal to the number Ei of module widths or not, and calculating the number N when ei is equal to Ei, wherein g is the number of modules in the similar edge distance of the code word; determining that the decoding of the code word is not successful if N is less than g-2 or N is less than or equal to one; searching to-be-selected possible code words Fi if N is greater than or equalt o g-2 or N is greater than 2; selecting the code word with the minimum error Err as the correct code word from all possible code words through the least square method, and carrying out the detection of an error code for the code words; determining that the decoding is successful if the error code detection is passed, or else determining that the decoding is not successful; selecting the possible characters if N is equal to g, and carrying out the related calculation whether the characters are error codes or not. The method can greatly improve the decoding success rate of bar code words.

The invention discloses a communication method for guiding landing assisting of a helicopter based on grading fountain codes. The communication method specifically comprises the following steps of 1, after a ground guide person selects a proper landing airport, firstly, fixing four beacons at four corners of a landing mark H, starting the four beacons, and waiting the helicopter; 2, enabling the helicopter to carry a receiving end, and searching an ultraviolet signal which is broadcast and sent by a sending end; 3, enabling a pilot to complete the aligning of the helicopter and the beacons according to the display of the received light intensity indication lamp array; 4, enabling the pilot to finely adjust the gesture of the helicopter in real time according to the information displayed on a liquid crystal screen, so as to complete the safety landing of the helicopter. The communication method has the advantages that by combining the communication strategies for landing assisting of the helicopters with ULC-LT (unequal leveling code - Luby transform) codes in different stages, the decoding success rate of the takeoff and landing assisting communication is improved, the false bit rate is reduced, the reliable communication under the condition of high channel packet loss rate is guaranteed, and the searching, positioning and landing efficiency and safety of the helicopter are improved.

The invention provides a module for calculating bar space boundary pixel points. The module comprises a scanning boundary acquiring unit and a linear scanning unit, wherein the scanning boundary acquiring unit is used for acquiring bar space boundary points and a bar code direction and calculating a scanning boundary; and the linear scanning unit is used for selecting a scanning start point and a scanning final point corresponding to the scanning start point according to the scanning boundary and calculating coordinates of pixel points on a straight line between the scanning start point and the scanning final point. The method also provides a method for calculating the bar space boundary pixel points. The module for calculating the bar space boundary pixel points can adjust a decoding direction according to the bar code direction, acquire an accurate coordinate value of a bar code boundary and enhance a decoding success ratio.

The invention belongs to the technical field of channel coding, in particular to a design method of an original mode diagram LDPC code. The scheme of the invention utilizes the advantages of flexibleconstruction and convenient analysis of the original module LDPC code, optimizes the PEG algorithm of the original module LDPC code, and constructs a more sparse LDPC code. By adding the constraint conditions of PEG algorithm in removing duplicate edges, that is, adding the constraint to increase the average minimum distance of non-zero elements in the selection of inspection nodes, the burst resistance of PEG algorithm is achieved. The method not only inherits the advantage of traditional PEG algorithm without four rings, but also ensures that the ring length is as large as possible. Throughsuch a design method, the performance of LDPC codes under medium and short codes is improved, and the purpose of anti-burst can be achieved. Finally, in the burst deletion channel, the method of adding interleaving is used to further improve the decoding success rate.