48results about How to "Guaranteed video quality" patented technology

The invention discloses a video monitoring front end memory method and a video monitoring system. According to the invention, a front-end memory strategy including stored frame number per second is configured on video monitoring front end equipment; the front end memory is performed by the video monitoring front end equipment according to the configured memory strategy; and the memory strategy can be adjusted when the triggering condition is satisfied through judgment. Through the invention, the recording parameter of the video monitoring can be dynamically adjusted as required, the memory space is reduced to the utmost under condition of limited front end memory space, so more audio-video data can be stored, and the recording definition is ensured in case of emergency.

The invention provides an H.264 downsizing transcoding method based on texture and motion characteristics, and belongs to the technical field of computer digital video transcoding. The invention specifically comprises the following steps: (1) acquiring the coding information input into the H.264 code stream; wherein, the coding information includes an inter-frame coding mode, motion vectors and discrete cosine transformation coefficients; (2) dividing the motion area and the background area according to the image texture characteristics by means of the motion edge detection; (3) adopting the corresponding inter-frame mode according to the motion characteristics of the macro-blocks located in different areas, particularly, reconstructing the motion vectors by the adaptive motion vector re-sampling method or the align-to-worst weighting method according to the motion difference of the macro-blocks located in the motion area, reconstructing the motion vectors of the macro-blocks located in the background area by the align-to-average weighting method, and carrying out the motion search of the macro-blocks located on the edge of the motion object and the internal macro-blocks. Compared with other methods, the method of the invention can not only guarantee the quality of the transcoded video, but also effectively solve the problem of the downsizing transcoding real-time performance.

The invention discloses a coding method for data transmission, mainly comprising the following steps: step a, setting an initial value p<t> of the predicted packet loss rate and the FEC redundancy r; step b, coding the data at the channel sending end to obtain a plurality of information packets; step c, calculating the packet loss recovery probability according to the predicted packet loss rate and the FEC redundancy r, and selecting an optimal RS coding model RS(Nf, kf); step d, carrying out error correction coding according to the optimal RS coding mode RS(Nf, kf) to obtain Nf-kf redundant packets; and step e, packaging and sending the coded redundant packets and the information packets together, and enabling the receiving end to update the predicted packet loss rate according to the packet loss conditions of the received information packets. According to the scheme disclosed by the invention, the channel sending end sends the efficiently-coded FEC redundant packets while sending the information packets so as to ensure that the channel receiving end can recover the packet loss in a video transmission process, and thus the video quality of the receiving end can be ensured.

The invention discloses a video code rate selecting method driven by user experience under an HSPA (High Speed Packet Access) system. The method comprises the following steps: firstly, extracting bottom layer network velocity in the previous segment transmission time interval, and estimating the network velocity when the next segment transmits according to the velocity; then extracting the number of the video frames not played in the current play buffer memory by the current user; finally determining the code rate version of the next requested video according to the network state and the number of the video frames in the buffer zone. Aiming at the video transmission problem in the HSPA system, the method comprehensively considers the factors such as the network state of each user and the play condition of the terminal user, provides a code rate self-adaptive video segment requesting method, and can effectively improve the experience level of the terminal user.

The present invention discloses an HEVC fast coding method. During the coding process, the temporal similarity between optimal coding units of the same coordinate position in forward and backward reference frames, the spatial similarity between adjacent optimal coding units in the left and right direction, and the spatial similarity between adjacent optimal coding units in the up and down direction, are fully utilized to figure out the depth predicted values of P-frame or B-frame optimal coding units. After that, based on the one-to-one correspondence relationship between the depth predicted values of the optimal coding units and depth ergodic intervals, the depth ergodic intervals of the optimal coding units are determined. The optimal coding units and all coding units in the optimal coding units are coded within the depth ergodic intervals. During the coding process, qualified P-frame or B-frame optimal coding units and qualified coding units are selected quickly in the prediction mode, so that the unnecessary depth traversal and the unnecessary prediction-mode traversal are avoided. Therefore, on the premise that the video quality is ensured, the calculation complexity of the video coding is lowered.

The invention provides a video coding conversion transmission control system based on network state self-evaluation. Aiming at the problems that the network evaluation algorithm judges the network state only by depending on the packet loss rate, the judgment division is too rough, the limitation of serving as a video transmission rate adjustment basis is large and the like, the invention providesa method for combining the packet loss rate, the network delay and the delay jitter as network state evaluation factors, and the judgment of the network state is more scientific and accurate. Aiming at the problem that effective pre-control measures cannot be taken under the condition that a network has an overload trend but is not overloaded, a network overload pre-control method is added, and the network overload problem is skillfully processed at any time. Aiming at the problems that the network overload is too serious and overload control cannot be carried out by simply adjusting coding parameters, the invention provides a non-key frame active abandoning method, so that the video quality is ensured, the transmission quality is also ensured, a frame loss strategy is carried out before coding, the coding workload is reduced, and the robustness and the high efficiency are higher.

The invention provides a video coding method, system and equipment based on a face detection technology and a computer readable storage medium. The method comprises the steps of obtaining a to-be-coded video frame; carrying out face detection on the to-be-coded video frame based on a preset rule to obtain a face detection result, determining an interest area of the to-be-coded video frame according to the preset rule and the face detection result, and taking an area except the interest area in the to-be-coded video frame as a non-interest area; and obtaining respective corresponding code ratesof the interest region and the non-interest region, and respectively encoding the interest region and the non-interest region based on the respective corresponding code rates. According to the invention, the user experience can be considered while the video transmission code rate is reduced.

The invention discloses a quick size reduction transcoding method based on a region of interest, and belongs to the technical field of digital video transcoding of computers. The quick size reduction transcoding method comprises the following steps of: (1) acquiring encoded information from an input H.264 encoded code stream, wherein the encoded information comprises an inter-frame encoding mode, a motion vector and a discrete cosine conversion coefficient; and performing size reduction on a video of a pixel from a common intermediate format (CIF) into a quarter common intermediate format (QCIF), namely 176 pixels *144 pixels; (2) dividing a motion region and a background region by use of motion edge detection according to an image texture characteristic; and (3) adopting corresponding inter-frame modes for macroblocks positioned in different regions according to the motion characteristics of the marcoblocks, performing motion vector reconstruction on the macroblocks positioned in the motion region according to motion differences of the macroblocks by respectively selecting an adaptive motion vector down-sampling method or a most severe weighing method, performing the motion vector reconstruction on the macroblocks positioned in the background region by adopting an average weighing method, and performing motion search on the macroblocks positioned on the edge of and in a motion target. By utilizing the quick size reduction transcoding method, the quality of a transcoded video can be guaranteed, and the instantaneity of size reduction transcoding is realized.

The invention discloses a multimedia data transmission method and electronic equipment. Before a first terminal transmits multimedia data to a second terminal, the method includes the steps that the multimedia data to be transmitted are partitioned into first data and second data according to preset data partitioning strategies; the first data are processed in a first processing mode to obtain third data, and the second data are processed in a second processing mode to obtain fourth data, wherein the total data volume of the third data and the fourth data is smaller than that of the first dada and the second data, and the first processing mode is different from the second processing mode; the third data and the fourth data are transmitted to the second terminal so that the third data and the fourth data can be combined by the second terminal according to combination strategies corresponding to the partitioning strategies. The multimedia data transmission method and the electronic equipment can decrease the transmission data volume and also can keep the video quality of a watched area.

The invention discloses a media data storage method, device and system. The method comprises the following steps: acquiring storage associated information of media data to be stored, wherein the mediadata to be stored include current media data and history media data, and the storage associated information at least include one of time information, event information and a storage region; acquiringcoding information of the media data to be stored according to the storage associated information of the media data to be stored, wherein the coding information at least includes a coding way and a coding parameter; coding the media data to be stored according to the coding information of the media data to be stored to obtain coded media data; and saving the coded media data in the storage regionof the media data to be stored. Through adoption of the media data storage method, device and system, the technical problem that media data storage time is too short since the space of storage equipment is limited in the prior art is solved.

The invention relates to a video image transmitting method and a system. A transmitting terminal only detects and transmits a motion vector corresponding to the change section of the face of a user to a receiving terminal after transmitting a first video image to the receiving terminal, and the motion vector is integrated with the first video image by the receiving terminal to recover the entire video image. Accordingly, the method can effectively reduce the requirement for the network bandwidth and maintain the video quality.

The invention relates to a video source tracing method based on the watermarking technology, and the method comprises the following steps: extracting an original video, and obtaining the equipment information and user information; carrying out the conversion of the original video through employing a discrete cosine transform algorithm, converting the original video into a frequency domain from the time domain, and generating a to-be-embedded watermark through employing a watermark generation algorithm; enabling the to-be-embedded watermark to be embedded into the transformation domain of the original video through a watermark embedding algorithm, and generating a video comprising a watermark; carrying out the conversion of the video comprising the watermark through a reverse conversion algorithm, converting the video from the frequency domain into the time domain, and generating the original video comprising the watermark. According to the invention, the method enables the original video to be converted into the frequency-domain video from the time-domain video, and then the watermark is embedded into the frequency-domain video. The method employs the watermark generation algorithm and the watermark scrambling algorithm to generate the to-be-embedded implicit watermark. The to-be-embedded implicit watermark is embedded in the frequency domain of the frequency-domain video, and the generated video comprising the watermark is good in quality, is high in hiding performance and safety, is good in sense, and achieves a better source-tracing effect.

A control method for a handheld gimbal (100), the handheld gimbal (100), and a handheld device (1000) are disclosed. The handheld gimbal (100) includes a handheld part (10) and a gimbal (20). The gimbal (20) is mounted on the handheld part (10). The gimbal (20) is configured to install a camera (200) to capture a target object. The handheld part (10) is provided with a human-machine interface module (30). The human-machine interface module (30) includes a display screen (32). The display screen (32) is configured to display an image acquired by the camera (200), and the image includes an imageof the target object. The control method includes: acquiring a first motion instruction that controls the motion of the gimbal (20) according to the motion state of the image of the target object; and controlling the motion of the gimbal (20) according to the first motion instruction.

The invention relates to the field of automobile rearview, in particular to an automobile rearview system, which comprises a rearview mirror optical system arranged on the outer side at the front end of an automobile and a video acquisition system embedded in the rearview mirror optical system, wherein the video acquisition system is connected with a video processing system which is connected with a display screen located in a carriage. According to the invention, on the basis of reserving the rearview mirror in the prior art, a video manner is added to acquire rearview information, a driver does not need to change the existing driving habits and can acquire the rearview environment information through the display screen in the carriage, so that the driver can further acquire rearview conditions conveniently in a severe environment to guarantee driving safety, and the driving experience of a user is improved.

Systems and methods for low complexity encoding and background detection are described herein. One aspect of the subject matter described in the disclosure provides a video encoder comprising a memory configured to store a video block. The video encoder further comprises a processor in communication with the memory. The processor is configured to determine whether the video block is background by comparing the video block to a corresponding block located in a previous temporal frame. The processor is further configured to determine, when the video block is not background, whether one or more sub-blocks of the video block are background by comparing the sub-blocks to corresponding sub-blocks located in the previous temporal frame.

The invention belongs to the field of audio and video, particularly relates to a code stream selection system, method and equipment based on multi-code stream distributed video stitching, and aims to solve the problems that in the prior art, the optimal video code stream selected by a receiving node cannot be ensured, and the consistency of video code stream selection cannot be ensured for a cross-screen window. The system comprises a video sending node, a multi-layer switching private network, a splicing video receiving node, a display device and a splicing control server, the splicing control server comprises an instruction receiving unit which is configured to receive window layout information input by a user; the instruction issuing unit issues a windowing instruction to the video splicing receiving node; and the code stream selection unit is configured to calculate the visual area of the window of each window, determine the corresponding priority and further select the to-be-received video code stream of each window. According to the invention, the reliability and effectiveness of the video code stream selected by the receiving node are improved, and the same window can be ensured to select the same code stream on different receiving nodes.