Sony Corporation

Junya Araki

Takahiro Fukuhara

Seiji Kimura

Kazuhisa Hosaka

Katsutoshi Ando

Disclosed herein is an information processing apparatus including: a partial decoding block configured to generate picture data by partially decoding a reversibly encoded picture code stream; an irreversible encoding block configured to encode irreversibly the picture data generated by the partial decoding block; and a control section configured to control the partial decoding block to determine the picture code stream part to be decoded in such a manner that a target compression rate of the picture data generated by the partial decoding block constitutes the compression rate corresponding to a target code quantity for the irreversible encoding block.

Information processing apparatus and information processing method for reducing the processing load incurred when a reversibly encoded code stream is transformed into an irreversibly encoded code stream

Searching an optimal quantization step size at high speed when controlling the coding rate of an image sequence. A skip binary search section determines quantization step size &#x394;by binary search, using a frame out of every m [0] frames of an image sequence. A quantization step size correcting section determines quantization step size &#x394;that can achieve the target bit rate R by linear approximation from &#x394;, generated bit rate at that time, quantization step size &#x394;of the immediately preceding loop and the generated bit rate at that time. A first coding section encodes the every m [1]-th frame of the image sequence with quantization step size &#x394;and a quantization step size forecasting section determines quantization step size &#x394;that can achieve the target bit rate R by linear approximation. A second coding section encodes all the frames with the quantization step size &#x394;.

Coding apparatus, coding method, coding program and recording medium

Disclosed herein is an information processing device including a bitplane expanding section, a coding section, a selecting section, and a selection controlling section. The bitplane expanding section expands image data into bitplanes as sets of bits at identical places in each unit of a predetermined number of pieces of data each having a bit depth of a plurality of bits. The coding section codes the image data expanded by the bitplane expanding section in each the bitplane in predetermined order. The selecting section selects compressed data and non-compressed data as a result of coding of the image data. The selection controlling section controls the coding section to stop a coding process and selecting the non-compressed data for a bitplane situated at a position subsequent to a bitplane for which the non-compressed data is selected by the selecting section in the predetermined order.

Information processing device and method

An information processing apparatus includes: a synthesis filter unit configured to execute synthesis filtering for coefficient data of each subband, obtained by decoding a code stream of a reversibly-encoded image and performing band division, in each predetermined number of lines or in each predetermined block to obtain baseband image data on a line basis; a storage unit configured to store the baseband image data obtained by the synthesis filter unit; an analysis filter unit configured to read the baseband image data stored in the storage unit and execute analysis filtering for the image data to divide the image data up to a predetermined division level; and a control unit configured to control the analysis filter unit to execute analysis filtering as soon as the amount of the baseband image data stored in the storage unit reaches a data amount allowing analysis filtering.

Information processing apparatus and method

Disclosed herein is an information processing apparatus configured to process a code stream having a first resolution with data having the first resolution scalably encoded, including setting means, first creating means, authoring means, second creating means, and code stream replacing means.

An information processing apparatus for encoding image data includes: a rearranging unit for rearranging coefficient data divided for each frequency band in order of executing synthesis processing for synthesizing the coefficient data of multiple sub-bands divided into frequency bands to generate image data for each line block including image data equivalent to the number of lines necessary for generating coefficient data equivalent to one line of the sub-band of the lowest frequency components; a control unit for calculating a new quantization step size at the time of encoding the image data for each coding unit using the ratio between the generated code amount at the time of encoding with a known quantization step size and a target code amount at the time of encoding the image data; and an encoding unit for encoding the coefficient data for each coding unit to generate encoded data using the calculated quantization step size.

An apparatus and a method for compressing a picture by wavelet transform and entropy coding, in which the processing load of arithmetic coding may be relieved and rate control may be carried out effectively, while still maintaining the picture quality. An encoding object prediction unit predicts bitplanes to be encoded and extracts only those bitplanes which are to be encoded. An EBCOT unit generates an encoding pass from one bitplane to be encoded to another to execute arithmetic coding. In controlling the code volume to a target code volume, a rate controller sums the arithmetic codes in a sequence from the arithmetic code with the highest bit position in the totality of the code blocks of an input picture to the arithmetic code of the lowermost bit, from one bitplane to another or from one encoding pass to another, and halts the summation when the predetermined target code volume is exceeded.

Picture encoding apparatus and method, program and recording medium

In a color converter unit of an image encoding apparatus, a subtractor unit subtracts Y from Z and a divider unit divides the result of this subtraction (Z&#x2212;Y) by 2 and supplies the result to a component signal Yto an image coding unit. Another subtractor unit subtracts Y from X and another divider unit divides the result of this subtraction (X&#x2212;Y) by 2 and supplies the result as a component signal Yto the image coding unit. Y remains unprocessed and is supplied as a component signal Yto the image coding unit. The image coding unit compression-codes the converted three component signals Y, Y, Yaccording to the JPEG-2000 system to generate an encoded code stream. Thus, an image in the XYZ color space is compressed and expanded highly efficiently.

Image encoding apparatus and method, and image decoding apparatus and method

An image coding device for reducing flicker noise in moving image coding based on Motion JPEG-2000, which applies wavelet transform to an input image, quantizes the wavelet transform coefficients, and replaces quantization coefficients of adjacent frames in accordance with a predetermined judgment condition. The device spreads the finally output quantization coefficients into bit-planes from the MSB to LSB, generates coding passes in each bit-plane, performs arithmetic coding in the coding passes, controls the code quantity to a target code quantity from the generated arithmetic codes, and generates a packet of the image data by attaching a header to the arithmetic codes. The quantization coefficients are replaced based on a difference of absolute values of the quantization coefficients at the same sub-band in the adjacent frames. By further adding the wavelet transform coefficients, erroneous detection in the substitution processing can be decreased and the flicker noise can be suppressed effectively. Also, an image coding method for the same.

Image coding device and coding method of same

According to the present invention, not only still images but also moving images can be compressed with high quality. In an image coding apparatus, a wavelet transform unit low-pass filters and high-pass filters an input image signal in the vertical and horizontal directions to hierarchically transform a low frequency component repetitively. In the case of an interlaced image, the wavelet transform unit further decomposes a subband including, for example, a horizontal low frequency component and a vertical high frequency component in consideration of the characteristics of the image signal. A code-block generation unit divides quantized coefficients into code-blocks each having a predetermined size. The code-block serves as a unit subjected to entropy coding. In the case of the interlaced image, each code-block is set to, for example, 32&#xd7;32 so as to be smaller than each code-block of a progressive image.

Growing community of inventors

Tokyo, Japan

Junya Araki