Sharp Kabushiki Kaisha Corporation

Hiroshi Kusao

Hiroyuki Katata

Tomoko Aono

Norio Ito

Shuichi Watanabe

Toshio Nomura

Yoichi Fujiwara

Toshiyuki Miyake

Masaaki Hyodo

Hisashi Saiga

Shinya Hasegawa

Tadao Matsuura

Tadashi Uchiumi

Maki Takahashi

Takashi Nishimura

Ryuji Kitaura

Motohiro Ito

Masatoshi Tsujimoto

Kazuyuki Suga

Yohichi Fujiwara

Noritoshi Kakoh

Necessary coded data only can be read out at random accessing even with recording medium having coded data recorded thereon but whose code quantity is out of proportion to time. Once a recording medium was loaded into a recorder-player connected with a coded-data control device, the device reads control data from the recording medium and stores the data in a coded data control portion. At random accessing, the control data is read-out from the coded-data control portion and entered into a recording medium controller which in turn controls the recording medium to read-out only desired data according to the information inputted from the coded data control portion. In random access playback, fast playback from the midway of a video-sequence can be realized by accessing coded data of a video frame by using control data.

Coded data control device

Disclosed herein is a 3-D image display unit that can be controlled flexibly to protect the user from eyestrain and operated easily. The 3-D image display unit includes measuring means for measuring a display time of a 3-D image, parallax adjusting means for instructing 3-D image forming means to adjust the parallax of the 3-D image. In the case where the 3-D image display time measured by the measuring means exceeds a predetermined time, the parallax adjusting means instructs the 3-D image forming means to reduce the parallax of the 3-D image to be formed, thereby the display means comes to display a 3-D image having a small parallax. The user can thus be protected from eyestrain.

3-D image display unit, 3-D image recording device and 3-D image recording method

An image encoder/decoder by which a partial image is encoded easily with a resolution meeting the user's demand, wherein the encoded amount of data is not increased and a necessary capacity of memory can be reduced. The image encoder has a tile decomposition portion which divides image data into tiles of N pixels&#xd7;M pixels, a wavelet transform coding portion which extrapolates predetermined data at the peripheries of the tiles outputted from the tile decomposition portion and performs subdivision to perform wavelet encoding. A management information generating portion generates information for managing the encoded data in order that the encoded data outputted from the wavelet transform coding portion can be decoded for each tile and for each subband of the wavelet encoding. Also, a coded data integration portion links the encoded data encoded by wavelet encoding for each tile by using the output of the management information generating portion and adds the managing information to the encoded data.

Image encoder and image decoder

A video coding device capable of adaptively processing input video data according to property of the data and realizing effective progressive transmission of the coded data even if image components are different in size and/or different in the number of subbands. The above-mentioned object can be realized by the provision of a transferring-order deciding and ranging portion that can prepare an integrated component unit by forming combinations of subband-based frequency-coefficients of respective components Y, U and V and can change the number of respective elements of respective components Y, U and V.

Image decoding device for decoding a hierarchically coded image

A moving picture coder has a first coding mode in which the entire picture is coded and a second coding mode in which a partial region of the picture is coded. Coding is so performed that the frame rate inside the partial region is higher than that outside the partial region. To perform such coding, the coder comprises a region selecting section ( ) for selecting the partial region, a shape coding section ( ) for coding is the shape of the partial region, a moving picture coding section ( ) for coding only the values of the pixels inside the partial region according to the selected region, and a coding control section ( ). A moving picture decoder decodes a picture in the second mode by superimposing decoded picture data of the partial region of the picture in the second mode on the decoded picture data of the entire picture in the first mode.

Video image coding device and video image decoding device

When a background interpolation-judging section judges that parts areas of a lower layer and an upper layer move significantly, and a visual effect can be obtained by the background interpolation, a controller controls a switch based on the area information of the parts area of the lower layer to perform the background interpolation. A weighted average section takes an average by weighting to the upper layer and the lower layer by using the interpolated background to generate an interpolated image. By using this interpolated image, the prediction-encoding/decoding of the upper layer is performed. On the contrary, when the background interpolation-judging section judges that parts areas do not move so significantly, and a visual effect cannot be obtained by the background interpolation, a background is synthesized by using the output of the interpolated image-forming section to generate an interpolated image. Hence, the shape information for the background interpolation is reduced and high quality of an image can be obtained.

Moving picture encoder and moving picture decoder

A motion picture coding and decoding apparatus synthesizes a lower layer frame at a certain time by using first component area information of a lower layer preceding in the time and second component area information of a lower layer succeeding in the time. For an area where the first and second component areas overlapped, or for an area which is neither the first nor the second component area on the lower layer frame, lower layer frames preceding and succeeding in time are subjected to weighted average for synthetisization. For the area corresponding to the first component area only, the lower layer frame succeeding in time is used, and for the area corresponding to the second component area only on the synthesized lower layer frame, the lower layer frame preceding in time is used, for synthesizing the lower layer.

Motion picture coding and decoding apparatus

An image coding apparatus inputs pixel data of a part image of high resolution. An upper layer coding portion ( ), a second shape data generating portion ( ), and a second shape data coding portion ( ) perform coding of shape data and pixel data in the upper layer. A down sampling portion ( ) generates pixel data of low resolution. A lower layer coding portion ( ), a first shape data generating portion ( ), and a first shape data coding portion ( ) code shape data and pixel data in the lower layer.

Motion image coding apparatus for performing hierarchical coding

If coding is carried out on the block basis on subband coding of an image, the hierarchical characteristic which a subband image inherently has would be lost. Thus, efficient coding is to be carried out while holding the hierarchical characteristic of the subband image. After the subband image is coded on the block basis, symbol information and coefficient information are decomposed and relocated for every subband before producing coded data.

Picture coding device and picture decoding device

In a motion-vector detecting device for detecting motion-vectors of images processed through a two-dimensional filter by a subsampling method, a filter circuit must process pixel values at a block boundary by delaying the pixel value in both horizontal and vertical directions, which complicates reading pixel data from memory and increases the size of the filter circuit. The present invention provides a motion-vector detecting device for detecting motion-vectors by searching a match of a coding block of a coding image with a prediction candidate-block in a searching area of a reference image. The invention further applies a one-dimensional filter for a coding block and a prediction candidate-block in a horizontal direction to restrict frequency bands of the blocks, and calculates a matching error-value between a part of the pixels in the band-limited coding block and a part of the pixels in the band-limited prediction block to detect a motion-vector, in calculating error-values for a group of pixels by the motion-vector detecting circuit, block-end pixels are considered to exist inside the block boundary by the number of pixels rounded off after a decimal point corresponding to one half of the number of taps of the spatial filters.

Motion-vector detecting device

An image coding apparatus inputs pixel data of a part image of high resolution. An upper layer coding portion (,), a second shape data generating portion (,), and a second shape data coding portion (,) perform coding of shape data and pixel data in the upper layer. A down sampling portion (,) generates pixel data of low resolution. A lower layer coding portion (,), a first shape data generating portion (,), and a first shape data coding portion (,) code shape data and pixel data in the lower layer.

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Chiba, Japan

Hiroshi Kusao