Abstract: A motion vector estimation circuit (101) interpolates, with sub-pixel precision, a prediction block indicated by a motion vector estimated with integer-pixel precision as well as a region around the prediction block within a search area in a reference picture, using a 2-tap pixel interpolator (605), and estimates two or more motion vectors indicating positions of prediction blocks having high correlation with a current block to be coded, within the interpolated region. A motion compensation circuit (102) interpolates, with sub-pixel precision, each of the prediction blocks indicated by the estimated motion vectors, using a 6-tap pixel interpolator (901), compares the coding costs of the interpolated prediction blocks, and determines a motion vector indicating a position of a prediction block having highest correlation with the current block, from among the estimated motion vectors.

Abstract: A system of detecting a motion vector for an object block in a current frame of an orthogonally transformed video with respect to a stored reference frame. The motion vector is detected by: extracting a predetermined pattern of lower frequency components from the object block; orthogonally inverse transforming the extracted lower frequency components within the pattern to yield the pattern of pixel data; searching the reference frame for a block having a maximum correlation with the pattern of pixel data; and calculating the motion vector from the object block to the block having a maximum correlation. As an orthogonal transform, DCT (discrete cosine transform) is preferable. Creating a row and a column image comprising sums obtained by adding all the pixels in each column and each row of the object block and applying the above searching and calculating process to the row and the column image enables the motion vector detection from a normal or noncompressed video.

Abstract: A device in a PAN 7 having a plurality of devices 1 to 6 connected by short range communication whose network configuration dynamically changes is provided. A cellphone 1 includes a discovery function to discovery the devices 2 to 6 for a device capable of carrying out prescribed processing based on a request for execution of the prescribed processing from the cellphone 1 and a transmission control function to transmit output control information for outputting a notice indicating the capability of carrying out the prescribed information to the devices found by the discovery.

Abstract: Provided is a terminal unit that, even in case video image is suspended by a handover, video reproduction is possible real-time at immediately after an end of the handover. In a video transmission system comprising a wireless LAN accommodated switch for switching over the connection relationship of a terminal unit and an access point, an access point for receiving video data sent from a terminal unit and sending it to another terminal unit, and a terminal unit for receiving video data sent from the access point thereby displaying a video image and carrying out an association establishment or release of a wireless channel to an access point, the terminal unit operates such that, when a calling party releases a wireless channel, the opposite terminal unit determines that the calling party has started a handover and makes an operation to change a video data encoding into an intra-frame encoding.

Abstract: Provided is a server apparatus and terminal unit for realizing a video transmission system that, even in case the video image is suspended by a handover, reproduction can be resumed at a video image of upon suspension. In a video transmission system having a video server for sending video data to a terminal unit through an access point and a terminal unit for receiving and displaying the video data sent from the access point and for establishing an association and releasing of a wireless channel to the access point, the terminal unit releases the access point and wireless channel and requests the video server to suspend the transmission and store video data. In case an association is established with a new access point, the terminal unit requests the video server to re-send the video data, etc. stored in the duration of from the release to an association establishment.

Abstract: A protocol for extending session endpoints in an ad-hoc network environment first performs device discovery to determine local devices within its coverage area and the capability of those devices. These local devices then exchange session descriptions with the endpoint device. If the current session may be supported by one of the local devices, the endpoint device, responsive to a command from an user, transfers the session endpoint to the local device and the endpoint device acts as a proxy for the local device in the session. Optionally, if the local device has a path to the correspondent node that is independent of the path through the endpoint device, it establishes the session along this path and then signal the endpoint node to terminate its session.

Abstract: A method for extending session endpoints in an ad-hoc network environment first performs device discovery to determine local devices within its coverage area and the capability of those devices. These local devices then exchange session descriptions with the endpoint device. If the current session may be supported by one of the local devices, the endpoint device, responsive to a command from an user, transfers the session endpoint to the local device and the endpoint device acts as a proxy for the local device in the session. Optionally, if the local device has a path to the correspondent node that is independent of the path through the endpoint device, it establishes the session along this path and then signal the endpoint node to terminate its session.

Abstract: A multimedia title including sources of plural data-types such as a motion picture, still picture and text data, presentation methods of respective sources, and the data-types is edited in every frame, so that a video signal is created. Based on a scenario, the video signal is coded adaptively to respective data-types of each source. As a result, calculation volume is reduced and picture quality is improved.

Abstract: A video coding method and apparatus realize that a calculation amount required to perform a converting process operation of compression formats can be reduced, and also deterioration in an image quality, which is caused by this compression format converting process operation, can be reduced. A video converting unit includes added information processing means for using added information contained in an input bit stream in coding operation. This added information involves a motion vector, a motion prediction difference signal, a quadrature converting coefficient, and a quantizing value.

Abstract: A data communication system and method for forwarding data messages in a wireless network having an access point is disclosed. To forward data messages in accordance with the present invention, levels with respect to the access point are determined for wireless devices within the wireless network. Data messages are then transferred sequentially by level between the access point and other wireless devices within the wireless network.

Abstract: A resolution transformation apparatus which has longitudinal and lateral change ratio input means 101 for inputting the longitudinal and lateral change ratios of an image, low-frequency orthogonal transformation block extraction means 103 for extracting only low-frequency areas of N orthogonal transformation blocks required for resolution transformation from before-transformation orthogonal transformation image memory 102 for storing orthogonal transformation images before undergoing resolution transformation, resolution transformation means 104 for executing resolution transformation and generating M orthogonal transformation blocks from the N low-frequency orthogonal transformation blocks, and orthogonal transformation block storage means 105 for storing the Morthogonal transformation blocks after resolution transformation in after-transformation orthogonal transformation image memory 106.

Abstract: A first data sequence generated by a first moving picture coding system having an intra-frame coding mode and an inter-frame coding mode is transformed to a second data sequence generated by a second moving picture coding system having an intra-frame coding mode and an inter-frame coding mode. The method includes prereading a coding mode of a successive frame succeeding a present frame from the first data sequence, judging whether or not a preread coding mode of the successive frame is the intra-frame coding mode and determining whether or not to code the present frame by the second moving picture coding system corresponding to a generated code amount of the second data sequence when the coding mode of the successive frame is the intra-frame coding mode. Data coded by the intra-frame coding mode existing in the first data sequence is transformed to the second data sequence.

Abstract: A method for transforming a first data sequence, generated by a first moving picture coding system that switches an intra-frame coding mode and an inter-frame coding mode on a block unit basis to a second data sequence, generated by a second moving picture coding system that switches an intra-frame coding mode and in inter-frame coding mode on the block unit basis. The method includes increasing the number of blocks to be coded by the intra-frame coding mode in the second moving picture coding system when a generated code amount of the second data sequence is less than a target value.

Abstract: An image coding system converting apparatus is arranged by employing input means 102 for sequentially reading an input bit stream, a decoder unit 103 for decoding inputted data, a data buffer 104 for saving either non-compression image data or image data being decoded in a half way, an added information buffer 105 for saving either added information related to image data or added information related to a coding system, an encoder unit 106 for encoding the image data read out from the data buffer 104 with reference to the added information read out from the added information buffer 105, and output means 107 for outputting the image data encoded by the encoder unit 106.

Abstract: The transformation method for moving picture coding system reads data of a frame from the first data sequence in the first moving picture moving coding system, prereads a coding mode of a successive frame to record, and when the preread coding mode of the successive frame is the intra-frame coding mode, performs a control not to perform coding of a present frame or decrease a generated code amount corresponding to the generated coed content of the second data sequence in the second moving picture coding system. Then, the method preferentially transforms data coded by the intra-frame coding mode existing in the first data sequence to the second data sequence.

Abstract: Image coding equipment wherein no sense of incongruity occurs when domains whose image quality should be improved are selected. To the domains selected with the domain selection section 111, the gradual coding parameter calculation section 112 computes the quantization values so that the quality of image may improve gradually toward the central part from the outside of the selected domain, and a picture is coded based on the value of such a parameter.

Abstract: Moving picture transforming system which executes transformation of moving picture coding scheme at high speed and with less degradation of picture quality, in that there are provided a motion compensating means 42 for compensating an image based on the motion information output from the variable length decoding means; a moving picture decoding means 120 consisting of an image memory for storing a reference image used by the motion compensating means; a motion information memory portion 20 for storing the motion information output from the moving picture decoding means; a motion prediction controlling portion 60 for outputting a candidate of the motion vector and controlling execution of the motion prediction, based on the motion information accumulated in the motion information memory portion; a motion candidate memory 53 for storing a plurality of outputs of the motion prediction controlling portion in sequence; an adaptive motion predicting means 51 for performing the motion prediction of the image output

Abstract: A video signal conversion apparatus converts DV-format encoded compressed video data to MPEG format data, by utilizing motion flag information contained in the DV data which specifies for each of respective DCT blocks whether interlaced-frame mode DCT processing or progressive-field mode DCT processing has been applied to the block when executing DV encoding. The motion flag information can be used by a procesing mode selection section to determine various MPEG encoding modes to be applied in units of MPEG macroblocks, such as selecting respective macroblocks to be subjected to interlaced-frame mode DCT processing by an orthogonal transform processing section when the set of motion flags corresponding to the blocks constituting that macroblock are judged to indicate no substantial amount of motion for the macroblock, and to select progressive-field mode DCT processing when a substantial amount of motion is judged to exist.

Abstract: When the bit rate of the moving picture data is changed, and the moving picture data is newly produced, to quickly realize the moving picture data production without decoding the moving picture data, and without generating the image quality deterioration due to the motion compensation error. The non-compression moving picture data is an input, quantization means, and rate correction data producing means for producing the rate correction data which is the data to be used at the time of bit rate change, are provided, and the moving picture data having together the rate correction data other than the normal moving picture stream is produced. Thereby, by selecting and replacing the rate correction data whose bit amount is different in the input moving picture data, by adjusting to the objective bit rate, the bit rate is changed and the moving picture data can be quickly produced without decoding the moving picture data.

Abstract: To perform a motion picture format conversion at high speed in a motion picture converting apparatus, the apparatus comprises: input device 101 for inputting a digital image signal constituted of blocks, each block being orthogonally transformed; a frame memory 102 for storing the digital image signal; block reading device 103 for reading the blocks or a macro block from the frame memory in response to a request; region dividing section controlling device 109 for sending a read request to the block reading device; component extracting device 104 for extracting a low-frequency component alone of the captured image signal; two low-resolution frame memories 105 for storing extracted information; motion detecting device 106 for detecting a motion in accordance with the information in the low-resolution frame memories; a region dividing section 113 including macro block classifying device 107 for labeling the macro block in response to a motion detection result by the motion detecting device and label storing devi