Abstract: A wireless sensing system and a method thereof are provided. The wireless sensing system includes: a data processing center; and a first sensor module for processing a first source data into a first dynamic counting sketch data structure. The first dynamic counting sketch data structure has a bit length determined based on the first source data. The data processing center estimates the first source data based on the first dynamic counting sketch data.

Abstract: A wireless sensor network and data sensing method thereof are provided. A prediction model is established according to sensed data. When statistical value of the sensed data is within a user allowable range, the average value of the sensed data is returned to a user based on the prediction model. Alternatively, when the statistical value of the sensed data is beyond the user allowable range, actually sensed data is returned to the user based on the prediction model. In addition, the prediction model may further be dynamically updated according to subsequently received sensed data.

Abstract: A wireless sensing system and a method thereof are provided. The wireless sensing system includes: a data processing center; and a first sensor module for processing a first source data into a first dynamic counting sketch data structure. The first dynamic counting sketch data structure has a bit length determined based on the first source data. The data processing center estimates the first source data based on the first dynamic counting sketch data.

Abstract: A method for processing multiple continuous Top-K queries, which is performed between a master server and multiple of slave servers, including steps of: a first step, for arbitrarily selecting the multiple of slave servers and querying and counting up K of accumulated values of which are recorded at most; a second step, for calculating every two adjacent values which have been sent from the same servers to obtain an average value as a threshold; and a third step, for measuring variations of an upper bound and a lower bound for each of the values by using the threshold, and reporting to the master server at a time of the value being in excess of the upper bound or lower than the lower bound for each of the values.

Abstract: A wireless sensor network and data sensing method thereof are provided. A prediction model is established according to sensed data. When statistical value of the sensed data is within a user allowable range, the average value of the sensed data is returned to a user based on the prediction model. Alternatively, when the statistical value of the sensed data is beyond the user allowable range, actually sensed data is returned to the user based on the prediction model. In addition, the prediction model may further be dynamically updated according to subsequently received sensed data.

Abstract: A method for processing multiple continuous Top-K queries, which is performed between a master server and multiple of slave servers, including steps of: a first step, for arbitrarily selecting the multiple of slave servers and querying and counting up K of accumulated values of which are recorded at most; a second step, for calculating every two adjacent values which have been sent from the same servers to obtain an average value as a threshold; and a third step, for measuring variations of an upper bound and a lower bound for each of the values by using the threshold, and reporting to the master server at a time of the value being in excess of the upper bound or lower than the lower bound for each of the values.

Abstract: A mask matching approach to detect shot changes in MPEG coded video uses reference ratio variances of macroblocks between MPEG coded frames. A function is designed to quantize the results into shot change probability values. Moreover, a conversion function modifies this probability computation to minimize misdetection and loss of detection under unusual image pattern situations. A shot change probability threshold is defined for the video to be examined. When a frame's modified shot change probability exceeds this threshold, the frame is considered to contain a shot change. With this approach, processing time is reduced by evaluating MPEG coded data directly, rather than the raw video.

Abstract: A video indexing and query execution system includes a processor which indexes video clips by: (a) identifying each symbol of one or more graphical icons in each frame of each video clip, (b) determining the horizontal, vertical and temporal coordinates of each symbol of the identified graphical icons, and (c) constructing a database for each identified symbol of the graphical icons. The processor converts a video query from graphical form to string form by: (a) receiving a video query specifying the vertical, horizontal and temporal coordinates of a graphical icon to be matched in at least one frame to be retrieved, and (b) constructing a normal 3-D string from the video query indicating the distance between each symbol of each icon in the video query in each direction.