Abstract: Embodiments of the present invention provide a multimedia quality monitoring method, and a device. The method includes: determining reference quality of multimedia according to reference video quality and reference audio quality of the multimedia; acquiring multimedia distortion quality that is after video distortion and/or audio distortion of the multimedia occur/occurs; and determining quality of the multimedia according to the reference quality of the multimedia and the multimedia distortion quality. Therefore, accuracy of a multimedia quality monitoring result is improved.

Abstract: Embodiments of the present invention disclose a shooting method, an apparatus, and a terminal. The method includes: after it is detected that a camera is started, instructing a display screen facing a shooting person to display a preview image; obtaining a preset lighting parameter; controlling a display screen facing a shot target to provide lighting by using the preset lighting parameter; and shooting an image according to a shooting instruction. In the embodiments of the present invention, a display screen may be used as an auxiliary light source, and the display screen is controlled to provide lighting by using a preset lighting parameter, so that the quality of an image shot by a camera in a low light condition is improved.

Abstract: A method for evaluating quality of video streams includes: obtaining video streams; obtain coding information of video frames in the video stream; evaluating the single frame quality according to the coding information of the video frames; and evaluating the sequence quality according to the single frame quality evaluation result. An apparatus and a system for evaluating quality are also provided. Thus, the quality of video data packets transmitted in a channel can be predicted accurately, and the single frame quality evaluation result of the video frames can be obtained immediately.

Abstract: A video quality assessment method and a video quality assessment apparatus are provided. The method includes: acquiring parameter information of video data, where the parameter information includes a bit rate, a frame rate, and packet information; performing calculation according to the bit rate or the frame rate to obtain benchmark video quality of the video data; calculating the number of successively lost packets according to the packet information, and calculating the number of effective packet loss times; performing calculation according to the number of effective packet loss times to obtain video packet loss and distortion quality of the video data; and performing calculation according to the benchmark video quality and the video packet loss and distortion quality to obtain final video quality. Using the number of effective packet loss times can accurately assess videos more effectively and reduce algorithm complexity.

Abstract: Embodiments of the present invention provide a multimedia quality monitoring method, and a device. The method includes: determining reference quality of multimedia according to reference video quality and reference audio quality of the multimedia; acquiring multimedia distortion quality after at least one of video distortion and audio distortion of the multimedia occurs; and determining quality of the multimedia according to the reference quality of the multimedia and the multimedia distortion quality. Therefore, accuracy of a multimedia quality monitoring result is improved.

Abstract: Embodiments of the present invention provide an imaging system, including: a first polarization element having a first polarization direction; a second polarization element having a second polarization direction; a third polarization element, where the third polarization element has multiple areas that respectively correspond to multiple pixel positions, each area in the multiple areas consists of a first semi-area and a second semi-area; a first projection device, projecting an image onto the multiple areas by using the first polarization element and based on the multiple pixel positions; and a second projection device, projecting an image onto the multiple areas by using the second polarization element and based on the multiple pixel positions. In the embodiments of the present invention, images from multiple views may be presented, by using a polarization element, in areas corresponding to pixel positions, which, therefore, can improve imaging resolution.

Abstract: A method and an apparatus for determining a small-object region in a video frame. The method includes dividing a current video frame into at least two regions, and determining a global motion vector corresponding to each region; determining an interframe motion vector of each group of adjacent frames in multiple video frames that include the current video frame and a reference frame of the current video frame; determining a candidate small-object region in the current video frame according to the interframe motion vector of the each group of adjacent frames and the determined global motion vector corresponding to each region; and performing filtering on the candidate small-object region in the current video frame, and determining a region obtained after the filtering as a small-object region in the current video frame.

Abstract: A video data quality assessment method and apparatus are disclosed. The video data quality assessment method includes: acquiring a compression distortion parameter of video data; acquiring a frame impairment distortion parameter/video data rebuffering parameter; and calculating a video quality parameter according to the compression distortion parameter and the frame impairment distortion parameter/video data rebuffering parameter, where the video quality parameter is a difference between the compression distortion parameter and the frame impairment distortion parameter/video data rebuffering parameter.

Abstract: A video frame fade-in/fade-out detection method is provided, the detection method includes: before motion search, performing inter-frame comparison on block direct current components in some rows of a picture or performing inter-frame comparison on block direct current components in a partial area of a picture; collecting statistics on an inter-frame comparison result; determining whether fade-in/fade-out exists, to choose whether prediction is in a weighted mode; and if it is detected, by means of inter-frame comparison on block direct current components on some rows, that no global fade-in/fade-out exists, selecting a partial area within a range of some detected rows to perform inter-frame comparison on block direct current components again, and detecting local fade-in/fade-out.

Abstract: The present invention discloses a video quality enhancement method and apparatus, and pertains to the multimedia video processing field. The method includes: receiving video interpolation information that is of a video and sent by a third party, where the third party is used to acquire the video interpolation information of the video; and performing a motion interpolation on the video according to the video interpolation information of the video to obtain a new video, where video quality of the new video is superior to video quality of the video. The apparatus includes: a first receiving module and an interpolation module. According to the present invention, calculation complexity of a process in which a terminal performs video quality enhancement can be reduced.

Abstract: Embodiments of the present invention disclose a shooting method, an apparatus, and a terminal. The method includes: after it is detected that a camera is started, instructing a display screen facing a shooting person to display a preview image; obtaining a preset lighting parameter; controlling a display screen facing a shot target to provide lighting by using the preset lighting parameter; and shooting an image according to a shooting instruction. In the embodiments of the present invention, a display screen may be used as an auxiliary light source, and the display screen is controlled to provide lighting by using a preset lighting parameter, so that the quality of an image shot by a camera in a low light condition is improved.

Abstract: Embodiments of the present invention disclose a method and an apparatus for acquiring video coding compression quality. The method may include: acquiring video stream information; calculating video content complexity according to the video stream information; and calculating video coding compression quality according to the bit rate, the frame rate and the video content complexity. In the embodiments of the present invention, the video coding compression quality may be acquired as long as the video frame information, the bit rate, the frame rate and the video content complexity of a video stream are acquired. The video coding compression quality may be used in subsequent video quality assessment. This process greatly reduces video quality assessment complexity and the assessment may be performed in real time. In addition, the assessed coding compression quality meets the subjective feeling of human eyes better.

Abstract: Embodiments of the present invention provide a multimedia quality monitoring method, and a device. The method includes: determining reference quality of multimedia according to reference video quality and reference audio quality of the multimedia; acquiring multimedia distortion quality that is after video distortion and/or audio distortion of the multimedia occur/occurs; and determining quality of the multimedia according to the reference quality of the multimedia and the multimedia distortion quality. Therefore, accuracy of a multimedia quality monitoring result is improved.

Abstract: A method, a system, and an apparatus for evaluating video quality are disclosed to improve accuracy of the evaluation. The method includes: obtaining information about a transmitted video; resolving the information about the transmitted video to obtain video frame parameters, where the video frame parameters include a compression distortion parameter and/or a video quality distortion parameter with packet loss; and calculating a video frame quality parameter according to the video frame parameters. An apparatus and a system for evaluating video quality are provided. The embodiments of the present invention improve accuracy of video quality evaluation without reference.

Abstract: In a method for evaluating media quality, media reference quality and rebuffering event distortion quality are obtained, final media quality are determined according to the obtained media reference quality and rebuffering event distortion quality, where a parameter of the rebuffering event distortion quality includes at least one of the following: the number of rebuffering events, a duration of the rebuffering event, a multiple rebuffering event interaction impact parameter, initial media quality, and a factor describing media content complexity. When media quality is calculated, impact of the multiple rebuffering event interaction impact parameter, the initial media quality, and the factor describing media content complexity on the media quality is considered, thereby making a media quality evaluation result more accurate.

Abstract: The present invention discloses a method and an apparatus for evaluating multimedia quality. The method includes: obtaining reference quality of a video and final quality of the video of a multimedia sequence, and reference quality of an audio and final quality of the audio of the multimedia sequence; determining reference quality of the multimedia sequence; determining a distortion value of the multimedia sequence according to the reference quality of the video, the final quality of the video, the reference quality of the audio, and the final quality of the audio; and determining multimedia quality of the multimedia sequence according to the reference quality of the multimedia sequence and the distortion value of the multimedia sequence. The method and apparatus for evaluating multimedia quality can directly reflect distortion of a multimedia sequence, accord with a subjective feeling of a person, and therefore can accurately and effectively evaluate the multimedia quality.

Abstract: A method, a system, and an apparatus for evaluating video quality are disclosed to improve accuracy of the evaluation. The method includes: obtaining information about a transmitted video; resolving the information about the transmitted video to obtain video frame parameters, where the video frame parameters include a compression distortion parameter and/or a video quality distortion parameter with packet loss; and calculating a video frame quality parameter according to the video frame parameters. An apparatus and a system for evaluating video quality are provided. The embodiments of the present invention improve accuracy of video quality evaluation without reference.

Abstract: Embodiments of the present invention disclose a method and an apparatus for obtaining a video quality parameter and an electronic device. The method includes dividing a target video segment into at least one video subsegment, where duration of every video subsegment is at least time perceivable by human eyes; obtaining a video quality parameter of the video subsegment; and processing the video quality parameter of the video subsegment, and obtaining a video quality parameter of the target video segment.

Abstract: The present invention discloses a video conversion method and apparatus, relates to digital media technologies. A video source is received and compression distortion quality of the video source is acquired. A transcoding policy corresponding to the compression distortion quality of the video source is acquired according to the compression distortion quality of the video source. It is determining, according to the transcoding policy, whether the video source requires transcoding. Transcoding parameters are generated according to the transcoding policy if the video source requires transcoding. The transcoding policy includes target video quality and the transcoding parameters include a target resolution, a target frame rate, and a target bit rate. The video source is converted according to the target resolution, the target frame rate, and the target bit rate, and generating a transcoded video.

Abstract: A video quality assessment method and a video quality assessment apparatus are provided. The method includes: acquiring parameter information of video data, where the parameter information includes a bit rate, a frame rate, and packet information; performing calculation according to the bit rate or the frame rate to obtain benchmark video quality of the video data; calculating the number of successively lost packets according to the packet information, and calculating the number of effective packet loss times; performing calculation according to the number of effective packet loss times to obtain video packet loss and distortion quality of the video data; and performing calculation according to the benchmark video quality and the video packet loss and distortion quality to obtain final video quality. Using the number of effective packet loss times can accurately assess videos more effectively and reduce algorithm complexity.