摘要:
When a prediction is made between fields with different parity, the predicative efficiency of a chrominance vector is improved by adaptively switching the generation of a chrominance motion vector depending on a encoding/decoding field parity (top/bottom) and a reference field parity (top/bottom), and the coding efficiency is improved accordingly.
摘要:
In a moving image encoding apparatus of this invention, a generated bit amount extracting section (21) counts generated bits of variable-length-encoded data in units of macroblocks, and a reference generated bit count is set in a parameter value control section (22) as an update condition for a parameter value in each block. The boundary value of the parameter value is set in an intra/inter determination section (23) as a criterion for selection of the intra-encoding mode. In the inter-frame encoding mode, the parameter value control section (22) updates the parameter value of a block in which the generated bit count value of encoded data obtained by the generated bit amount extracting section (21) exceeds a reference value. The intra/inter determination section (23) determines that the influence of a data error is large in a block in which the parameter value is continuously updated and exceeds the boundary value, and switches the current mode to the intra-encoding mode to perform refresh operation.
摘要:
An image data compression device includes: a quantization section which quantizes image data based on a quantization parameter; a FIFO buffer section in which quantized data for at least N frames (N is an integer larger than one) is buffered; an encoded data generation section which reads the quantized data from the FIFO buffer section, and generates encoded data; a rate control section which changes a quantization step by using a data size of the encoded data; and a frame skip section which skips a quantization processing of the quantization section. The rate control section calculates the quantization parameter by using an average data size of the encoded data for previous N frames, and the frame skip section performs the skip processing when a frame in which the quantization parameter is greater than a threshold continues equal to or more than a number of times for a number threshold.
摘要:
An apparatus and a method generate a coded block pattern (CBP) of an alpha channel image. An apparatus and a method encode or decode the alpha channel image using the method. The alpha channel image encoding apparatus includes a CBP generator generating a CBP of a first block corresponding to an encoding unit in the alpha channel image by allocating CBPs to a plurality of second blocks that includes the first block; and a bitstream generator generating a bitstream by encoding the CBP or the CBP and pixel values of the second blocks based on the CBP of each of second blocks.
摘要:
In a data transmission apparatus which performs a bit rate control in accordance with a state of a network, whether a bit rate is changed is determined based on a predetermined probability. By determining a probability value which is used to change a bit rate of each terminal in such a manner that a value obtained by averaging bit rates of all terminals in a communication system becomes a desired bit rate, a control with less fluctuations in bit rate is possible in each terminal, and the quality of real-time communication of, e.g., sounds/image can be improved. Further, the fairness with other control systems such as TCP can be realized.
摘要:
To achieve an encoding system including a highly efficient prediction performed in response to the content of a scene, a significance, and a motion characteristic of a moving picture and the like, memories a, b, c, motion compensator 5 responsive to an arbitrary transform parameter representing the motion of a prediction picture segment for generating a predicted picture by using arbitrary data stored in the memories a, b, c based upon the transform parameter, and memory update unit 15 for allowing the content of one or more of the memories to be updated at an arbitrary period of time, are provided.
摘要:
A method for decoding time data comprising decoding an encoded bit stream in units of one frame to generate decoded video data and a plurality of decoded header information items for each frame, detecting the time data included in each of the header information items, and determining identical time data which define identical points of time and are detected from at least two of the header information items as frame time data determining the point of time for outputting the decoded frame.
摘要:
The invention relates to a coding apparatus for embedding second data into first data without deteriorating the first data and a decoding apparatus for decoding coded data into original first data and second data without deteriorating those data. The invention provides a coding apparatus which has a memory for storing at least partial data of first data, and embeds second data into the first data by rearranging, according to the second data, the at least partial data of the first data that is stored in the memory. The invention also provides a coding apparatus for decoding coded data in which second data is embedded and at least partial data of the coded data has been subjected to rearrangement by using one of a plurality of rearrangement patterns. The decoding apparatus calculates correlation between adjacent data for each rearrangement pattern, and decodes the original first data and the second data according to a rearrangement pattern that is determined based on the correlation.
摘要:
In an image processing method for a mobile communication terminal, a threshold value is set in advance for a state of traffic. A processing buffer of a second layer of the mobile terminal then analyzes a current state of traffic and compares it with the pre-set threshold value. If the traffic exceeds the threshold value, resolution of an image input through a camera is reduced, and the resolution-reduced image is transmitted. As a result, a natural looking image can be provided according to the state of traffic and thus reliability of a service quality can be enhanced.
摘要:
The present invention provides a motion picture receiving device, comprising: image data receiving means for receiving encoded image data; decoding means for decoding the image data received by the image data receiving means; output means for outputting the image data decoded by the decoding means; and control means for determining an encoding condition of image data by communicating with a motion picture transmitting device which transmits the image data, and for controlling the decoding means to enable decoding of the image data encoded in accordance with the encoding condition; wherein, when the number of motion picture transmitting devices changes, the control means determines the encoding condition on the basis of the changed number of the motion picture transmitting devices.