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221results about How to "Save memory space" patented technology

Three-dimensional vector real-time dynamic stacking technique based on LOD (Level of Detail) transparent textures

The invention discloses a three-dimensional vector real-time dynamic stacking technique based on multiple LOD (Level of Detail) transparent textures. The three-dimensional vector real-time dynamic stacking technique comprises the following steps of: firstly, drawing various vector layers on the transparent textures of corresponding plotting scales respectively in an internal memory through data pre-processing, automatically carrying out block cutting on the vector layers, then saving the vector layers in a disk as an LOD pyramid data storage structure, and establishing a mapping relation with a same-level terrain and an image data block; and secondly, in a real-time terrain rendering and roaming stage, loading the transparent textures of vectors of the corresponding layers through dynamic selection, stacking the vector layers into the same level of image data block according to an established Alpha passage, and realizing the real-time stacking of the vector layers in the three-dimensional terrain based on an internal memory multi-passage texture blending technology. According to seamless visualization of high-resolution vector map data and a digital elevation model, the effect of the high-resolution vector map data and the digital elevation model in spatial information expression and analysis can be enhanced. According to the technique, the real time stacking of multilayer vector data in the rendering and roaming stage of a large-scale three-dimensional terrain scene is realized, and the dynamic interactive screening of the vector layers is supported.
Owner:北京峰盛博远科技股份有限公司

Rapid distortion correction method based on Bayer image

The present invention provides a rapid distortion correction method based on a Bayer image. The method comprises the steps of firstly, inputting the Bayer image acquired by a fish-eye lens and a CMOS sensor in an FPGA module, adopting an equidistant internal reference model to map a fish-eye image to a three dimensional spherical surface, utilizing a longitude and latitude mode to describe the three dimensional spherical surface, and obtaining a longitude and latitude coordinate transformation relation of the fish-eye image plane coordinate points and the corresponding mapping points of the three dimensional spherical surface; secondly, adopting a vertical fish-eye projection method to obtain a calculation formula of projecting the mapping points on the three dimensional spherical surface to the corresponding projection points in a two dimensional plane, and projecting the three dimensional spherical surface to the two dimensional plane again; and finally, adopting a transverse scanning interpolation method to transform the two dimensional Bayer image interpolation into a one-dimensional image interpolation, utilizing the multi-channel correlation of the Bayer image to divide an interpolation section into a plurality of segment sections, solving a cubic polynomial curve of the to-be-fitted variables in each section separately to obtain the pixel values of the to-be-interpolated points, and carrying out the interpolation on a corrected two dimensional plane image, thereby improving the Bayer image distortion correction precision.
Owner:湖南优象科技有限公司

Method and system for dynamic data synchronization

The invention relates to a method for dynamic data synchronization. When the dynamic data of a host computer is changed, the method includes the steps as follows: the host computer builds the synchronous request data of the record according to the record corresponding to the changed dynamic data, and transmits the synchronous request data to the record level synchronous process; the operation information is recorded according to the synchronous request data or the synchronous request data and the buffer zone of the global data, and the synchronous information is built through the synchronous rule and transmitted to a standby unit; the standby unit performs the synchronous operation for the required synchronous record in a synchronous manner according to the synchronous information transmitted by the host computer; after the standby unit achieves the synchronous operation of the record, the synchronized record is deposited and the response information which is synchronously achieved istransmitted to the host computer; after the host computer receives the response information, the changed dynamic data is synchronously achieved, and the synchronous operation is finished; the invention also discloses a system for dynamic data synchronization, and the method and the system of the invention can synchronize the dynamic data between the memory databases of the host computer and the standby unit in real time.
Owner:ZTE CORP

Parallel chain main chain transaction state synchronization method and device, and storage medium

The invention provides a parallel chain main chain transaction state synchronization method and device and a storage medium, and the method comprises the steps: synchronizing a plurality of parallel chain transactions from corresponding main chain nodes, and sequentially storing transaction Hash of each cross-chain transaction in each synchronized parallel chain transaction to generate a cross-chain transaction Hash sequence; packaging and executing each parallel chain transaction and storing an execution state; generating an execution state sequence of each cross-chain transaction according to the cross-chain transaction hash sequence and the execution state of each cross-chain transaction, and generating bitmap information; generating a verification hash according to each cross-chain transaction; generating a consensus transaction comprising the bitmap information and the check hash, and sending the consensus transaction to the corresponding main chain node so as to verify the checkhash according to each cross-chain transaction; and if the verification is successful, performing parallel chain consensus, and obtaining an execution state of each cross-chain transaction according to the bitmap information after the parallel chain consensus is successful so as to process the main chain service logic corresponding to each cross-chain transaction. According to the application, thememory space occupied by the cross-chain synchronous transaction state is greatly reduced.
Owner:HANGZHOU FUZAMEI TECH CO LTD

Method and device for realizing on-screen display (OSD) of characters

The invention discloses a method and a device for realizing on-screen display (OSD) of characters. The method comprises the following steps of: downloading dot matrix information corresponding to the common tag characters and the characters in an American standard code for information interchange (ASCII) character bank to a digital signal processor (DSP) memory; storing the dot matrix information corresponding to characters in a wide-byte character bank in a memory of a host; receiving an OSD display command and judging the types of to-be-displayed OSD characters; if the to-be-displayed OSD characters are the common tag characters and/or belong to the ASCII characters in the ASCII character bank, acquiring the dot matrix information corresponding to the to-be-displayed OSD characters from the memory of the DSP; if the to-be-displayed OSD characters are the characters in the wide-byte character bank, downloading the dot matrix information corresponding to the character from the memory of the host to the memory of the DSP; and uploading the dot matrix information corresponding to the to-be-displayed OSD characters to a video image to display. By using the method and the device, the required dot matrix character bank does not need to be downloaded to the memory of the DSP in advance.
Owner:HANGZHOU HIKVISION DIGITAL TECH

Method, device and apparatus for message forwarding of firewall equipment, and storage medium

ActiveCN109361609ASave memory spaceAvoid increased probability of cache access invalidationData switching networksArray data structureHash table
The embodiment of the invention provides a method, a device, and an apparatus for message forwarding of firewall equipment, and a storage medium. The method comprises the following steps: obtaining ato-be-forwarded message which comprises quintuple data; calculating a hash value of the quintuple data; querying whether a simplified session table item matched with the to-be-forwarded message existsin a simplified session array hash table previously built in the current CPU or not according to the hash value; obtaining a corresponding session table item template according to a template sessionaddress in the matched simplified session table item if the simplified session table item matched with the to-be-forwarded message exists in the simplified session array hash table; and forwarding theto-be-forwarded message according to the session table item template. According to the method, the device, and the apparatus for message forwarding of firewall equipment, and the storage medium, a large amount of memory space can be saved during the whole forwarding process; the problem that cache access failure probability is increased when a session table item is large due to large memory spaceoccupation can be avoided; and the stability of the overall forwarding performance of the firewall device can be improved.
Owner:NEUSOFT CORP

Moving object detection method resisting illumination variation

The invention relates to a moving object detection method resisting illumination variation. An existing moving object detection method is sensitive to the illumination variation frequently, and therefore when illumination variation occurs in a detection environment, accurate detection for a moving object is difficult. The moving object detection method resisting the illumination variation integrates an asymmetrical inter-frame difference method and a self-adaptation mixed gauss background difference method in inter-frame difference. The moving object detection method resisting the illumination variation includes a first step of preprocessing an input moving image, a second step of respectively conducting asymmetrical inter-frame difference moving object detection and self-adaptation mixed gauss background difference moving object detection, and a third step of comparing moving object results independently obtained through the two detection methods, calculating the moving object results, extracting a comprehensive moving object, filling cavities inside the moving object and filtering out some small interference through mathematics morphological processing. Through the moving object detection method resisting the illumination variation, the moving object can be accurately detected under the normal condition, and meanwhile the accuracy rate can reach over 90% under the condition that the illumination variation of the detecting environment occurs. Therefore, the moving object detection method resisting the illumination variation can meet needs of a monitoring system.
Owner:浙江欧托电气有限公司
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