Abstract: A method and a device for modifying a Lucene index file are disclosed. After acquiring a target field to be modified, an old term to be modified under the target field and a new term for replacing the old term, every segment in an index folder may be firstly traversed to generate corresponding information of the new term according to corresponding information of the old term and generate a new index file of the segment based on information under other fields of the segment and corresponding information of the new term and corresponding information of other terms under the target field of the segment. Then a corresponding original index file in the index folder is replaced with the new index file, thereby achieving the modification of a specific term under a certain field in the Lucene index file.

Abstract: A power over Ethernet apparatus is provided. The power over Ethernet apparatus includes a power sourcing equipment (PSE) controller, a main chip and a redundant controller. The PSE controller is for power allocation among ports of the power over Ethernet apparatus. The main chip is coupled to the PSE controller through a first branch and for controlling the PSE controller. The redundant controller is coupled with the main chip, and coupled to the PSE controller through a second branch to control the PSE controller when the main chip stops sending a heart-beat signal. Methods of power over Ethernet are also provided.

Abstract: Disclosed are a method and device for switching between operation modes. The method includes: reading a current operation mode of a surveillance device, and recording an exposure parameter of the current operation mode; and when a switch between operation modes is to be performed, setting a target exposure value of a target operation mode to which the current operation mode is to be switched to, and calculating an exposure parameter of the target operation mode in combination with the exposure parameter of the current operation mode. The device includes: a recording module; a detection module; and a switching module. The method and device of the disclosure directly estimate the exposure parameter of the target operation mode according to the exposure parameter of the current operation mode without gradually adjusting the exposure parameter by metering and exposure calculation, thereby significantly increasing a switching speed.

Abstract: A video monitor layout method and device are provided in the present disclosure. The method includes: determining a plurality of sample points on a map and determining a spatial range to be analyzed based on distribution regions of the plurality of sample points; obtaining grid units of the spatial range by rasterizing the spatial range to be analyzed; assigning a weight to each of the sample points, wherein the weight represents a level of monitor requirement at the sample point; and acquiring a weight value of each of the grid units according to the weight value of each of the sample points and a positional relationship between each of the sample points and each of the grid units and generating camera distribution position data of the spatial range based on the weight value of each of the grid units.

Abstract: A waterproof camera and a supporting structure thereof are provided. The supporting structure includes a cylinder body and a pan-tilt platform. The cylinder body is configured to form a first cavity for holding a front end assembly. The pan-tilt platform is provided outside of the cylinder body, and includes a second cavity isolated from the first cavity. The first cavity is isolated from the second cavity. A protection level of the cylinder body may be up to IP67 to better isolate water vapor, while a protection level of the pan-tilt platform may be up to IP66 to meet a waterproof demand of a transmission mechanism.

Abstract: A device for detecting posture change of a operation part in a camera and a method for restoring posture are disclosed. The device may include a photo interrupter and a photoelectric baffle structure including a plurality of baffle pieces fixed on a base. The baffle pieces may include a first baffle piece and remaining second baffle pieces of a length specification different from that of the first baffle piece, and there is a gap between two adjacent baffle pieces. An output signal from the photo interrupter changes according to the aligning relationship between the photo interrupter and the baffle pieces. One of the photoelectric baffle structure and the photo interrupter may follow the motion of an operation part of the camera while the other one remains unmoved, so that a posture change of the operation part may be detected based on the output signal from the photo interrupter.

Abstract: According to examples of the present disclosure, a method and apparatus for automatic white balance may be provided. A white region for performing automatic white balance may be obtained by a front end device of a video monitoring system. At least one cluster may be generated by clustering statistical points within the white region of a to-be-detected image by the front end device. The cluster may be determined as a target cluster and statistical points within the target cluster may be determined as white points by the front end device when the number of statistical points within the cluster is greater than a preset threshold. And a white balance gain of the to-be-detected image may be determined by the front end device based on the target cluster.

Abstract: A video monitor layout method and device are provided in the present disclosure. The method includes: determining a plurality of sample points on a map and determining a spatial range to be analyzed based on distribution regions of the plurality of sample points; obtaining grid units of the spatial range by rasterizing the spatial range to be analyzed; assigning a weight to each of the sample points, wherein the weight represents a level of monitor requirement at the sample point; and acquiring a weight value of each of the grid units according to the weight value of each of the sample points and a positional relationship between each of the sample points and each of the grid units and generating camera distribution position data of the spatial range based on the weight value of each of the grid units.

Abstract: A waterproof camera and a supporting structure thereof are provided. The supporting structure includes a cylinder body and a pan-tilt platform. The cylinder body is configured to form a first cavity for holding a front end assembly. The pan-tilt platform is provided outside of the cylinder body, and includes a second cavity isolated from the first cavity. The first cavity is isolated from the second cavity. A protection level of the cylinder body may be up to IP67 to better isolate water vapor, while a protection level of the pan-tilt platform may be up to IP66 to meet a waterproof demand of a transmission mechanism.

Abstract: A focusing method is disclosed, comprising: recording image statistical information corresponding to each position of a focusing lens from the beginning of focusing, wherein the image statistical information comprises a luminance value of image; determining whether the current scene is a point light source scene or not based on the recorded image statistical information; and executing a focusing process based on a regional luminance variance of image when the current scene is determined as a point light source scene. Wherein, the regional luminance variance of image denotes a mean of the square of differences between luminance values of a plurality of regions partitioned from an image and an average luminance value of the image. The method of the present disclosure can effectively improve the stability and accuracy of focusing effect under a point light source scene.

Abstract: The present disclosure provides a reversible powering device for an electronic equipment including a first power input port and a second power input port. Said reversible powering device including: a power input determining module configured to determine whether the first power input port or the second power input port of the electronic equipment has a power input respectively, and send a control signal to a switch controlling module if it is determined that the first power input port has a power input and the second power input port has no power input; and the switch controlling module configured to control a switch device according to said control signal such that the power input into the first power input port is output from the second power input port in a reverse direction to power another electronic equipment.

Abstract: A planning device and method of data storage are disclosed. The planning device includes a format-processing sub-logic and a space-allocation sub-logic. The format-processing sub-logic is for creating a formatting information area, for creating an index area for storing index data, and for creating a data area on a designated physical storage disk, and wherein the formatting information defines the index area and the data area. The space-allocation sub-logic is for allocating at least one data block to an upper-layer application in accordance with a size of a document needed to be stored. By adopting the formatting process, users may create the index area and data area on different physical storage disks so as to separate the index area and the data area. In this way, the users may store the information regarding the index area on different storage disks.

Abstract: In an example, a method of processing image is provided. According to the method, an image may be divided into a plurality of sub-regions; binarization threshold may be calculated for each of the sub-regions; a threshold surface of the image may be fit out according to the binarization threshold of each of the sub-regions, wherein the threshold surface comprises a binarization threshold corresponding to each pixel point in the image; and the image may be binarized based on the threshold surface.

Abstract: The present disclosure provides a method for calculating a focusing evaluation value. The method may be applied in a scene having a dynamic light source and include: dividing an image region of a camera into a plurality of sub-regions; selecting a first sub-region which is affected by a dynamic light source from the plurality of sub-regions; correcting a focusing evaluation value of the first sub-region with the focusing evaluation value of each of sub-regions adjacent to the first sub-region; and calculating a focusing evaluation value of the whole image region based on the focusing evaluation value of each of the sub-regions. The present disclosure improves the performance of auto-focusing in a scene having a dynamic light source.

Abstract: A method for auto recovery storage of JBOD array is disclosed. The method includes: determining whether a disk of the JBOD array is failed, deleting a storage resource according to a storage resource list for the failed disk is stored with an index area upon determining the failed disk, updating the index area corresponding to a recorded data area when the failed disk is stored with the storage resource of the recorded data area instead of the index area; transmitting control instructions indicative of adding a hot spare to the JBOD array to add the hot spare to the JBOD array, and adding the storage resource and activating the storage resource for the failed disk stored with the index area after the hot spare is added to the JBOD array.

Abstract: A focusing method is disclosed, comprising: recording image statistical information corresponding to each position of a focusing lens from the beginning of focusing, wherein the image statistical information comprises a luminance value of image; determining whether the current scene is a point light source scene or not based on the recorded image statistical information; and executing a focusing process based on a regional luminance variance of image when the current scene is determined as a point light source scene. Wherein, the regional luminance variance of image denotes a mean of the square of differences between luminance values of a plurality of regions partitioned from an image and an average luminance value of the image. The method of the present disclosure can effectively improve the stability and accuracy of focusing effect under a point light source scene.

Abstract: A method for synthesizing JPEG image and method and apparatus for superimposing OSD information onto JPEG image. The method for synthesizing JPEG image comprises performing entropy decoding, AC/DC coefficient decoding, inverse DC prediction and inverse quantization on the JPEG bit stream of a first image and a second image to obtain DCT coefficients; synthesizing the DCT coefficients in the order of JPEG raster scan according to the image stitching mode; and performing quantization, DC prediction, AC/DC coefficient encoding and entropy encoding on the synthesized DCT coefficients to form a bit stream of a synthesized image. For superimposing OSD information, only the region of the image to be superimposed is transformed by an IDCT. The OSD information is superimposed in the YUV plane and converted to DCT coefficients by DCT. The DCT coefficients superimposed with OSD information are synthesized with the DCT coefficients of non-superimposed region of the image.

Abstract: A video camera includes a first temperature sensor, a control logic circuit, a main system, a heating module, a fan and a power supply. After the power supply supplies power to the video camera, the first temperature sensor comes to be active, when the temperature sensed by the first temperature sensor is less than T1, the first temperature sensor outputs a control signal to the control logic circuit, which activates the heating module and the fan and prevents the power supply from supplying to the main system; and when the temperature sensed by the first temperature sensor is greater than T1, the first temperature sensor outputs a control signal to the control logic circuit which enables the power supply to supply to the main system and inactivates the heating module and the fan, and therefore, a normal activation and stable operation of the video camera at low temperatures are ensured.

Abstract: The present disclosure provides a reversible powering device for an electronic equipment including a first power input port and a second power input port. Said reversible powering device including: a power input determining module configured to determine whether the first power input port or the second power input port of the electronic equipment has a power input respectively, and send a control signal to a switch controlling module if it is determined that the first power input port has a power input and the second power input port has no power input; and the switch controlling module configured to control a switch device according to said control signal such that the power input into the first power input port is output from the second power input port in a reverse direction to power another electronic equipment.