Sony Corporation

Shojiro Shibata

Kyohei Koyabu

Shuji Tsunashima

Takaaki Fuchie

Shinjiro Kakita

Mototsugu Takamura

Goro Kato

Hiromichi Ueno

Yuya Horiuchi

Kashu Takahashi

Mitsuhisa Kaneko

Takeshi Shibata

Takao Suzuki

Yasuaki Takahashi

Takanori Takahashi

Keita Shirane

Seiko Maehara

Ikko Tanaka

An image coding apparatus includes a first coding unit that discretely selects quantization parameters of a first range to perform calculation of generated code amounts corresponding to the selected quantization parameters, a second coding unit that performs calculation of generated code amounts corresponding to quantization parameters of a second range, a code amount control unit that decides deciding a temporary quantization parameter corresponding to a target code amount by calculating generated code amounts through an interpolation process for quantization parameters not selected by the first coding unit, and by comparing the generated code amounts corresponding to the selected quantization parameters and the generated code amounts calculated through the interpolation process with the target code amount, and decides an optimal quantization parameter corresponding to the target code amount by comparing the generated code amounts calculated by the second coding unit with the target code amount.

Image coding apparatus and image coding method

An image processing device including a decoding unit that decodes compressed image data that is an encoded image and generates a decoded image that is decoded and parameters that relate to encoding which are calculated during encoding; an image processing unit that applies image processing including at least a color adjustment process on the decoded image; a control unit that controls whether to encode the decoded image on which image processing has been applied by the image processing unit using the parameters or to encode the decoded image without using the parameters according to processing of the image processing unit; and an encoding unit that encode the decoded image according to a control of the control unit.

Image processing device, image processing method, and program

An image coding apparatus for coding image data. The image coding apparatus includes: a first coding mechanism predicting a quantization parameter and a quantization matrix to be used for calculating a target amount of code for the image data by coding the image data; a second coding mechanism correcting the quantization parameter predicted by the first coding means from an error between an amount of generated code produced by coding using the quantization parameter and the quantization matrix predicted by the first coding mechanism and the target amount of code; and a third coding mechanism coding the image data using the quantization parameter corrected by the second coding mechanism.

Image coding apparatus and image coding method to generate a targeted amount of code

An information processing apparatus for decoding compression-coded video data, including: at least one decoder that decodes the compression-coded video data; and a controller than controls processing executed by the decoder, wherein the controller, when a picture at a head of a decoding processing unit is an I-picture or a P-picture among decoded pictures output from the decoder, controls the decoder so that a decode start timing at which the decoder starts decoding and a display output timing at which the decoder starts outputting the decoded pictures are displaced from each other by a first predetermined number of pictures.

Information processing apparatus and method, recording medium, and program

The present invention enables a circuit configuration to be simplified. An image encoding device () receives an input image () that is line-scanned in units of MBs as scan blocks, each constituted by a plurality of 4&#xd7;4 blocks, while being scanned in units of 4&#xd7;4 blocks as encoding blocks, each constituted by a plurality of pixels. The image encoding device () selects a VLC (variable length) table corresponding to a table selection index nC, which is an average value of the numbers nB and nA of nonzero coefficients as encoding values on which variable-length encoding is performed in upper-adjoining and left-adjoining 4&#xd7;4 blocks of a 4&#xd7;4 block as an encoding target in quantization coefficients as encoding target data based on the input image (). At this time, in a case where the 4&#xd7;4 block as an encoding target is at an upper end of an MB, the image encoding device () equates the number nB of nonzero coefficients of the upper-adjoining 4&#xd7;4 block with the number nA of nonzero coefficients of the left-adjoining 4&#xd7;4 block. The image encoding device () performs variable-length encoding on the number of nonzero coefficients of a 4&#xd7;4 block as an encoding target in quantization coefficients using the selected VLC table.

Image processing device and image processing method for reducing the circuit scale

The present invention can suppress the decline in video quality during encoding. The present invention generates, for each of the nine intra image prediction modes preset according to the AVC standard, a difference image data item containing a difference value from pixels surrounding a process-target pixel. Then, an encoding device () ranks the intra image prediction modes depending on the sum of absolute difference (SAD), which is the sum of differences that is based on the sum of absolute values of each process-target pixel of the difference image data item and a preference order of offset[n] preset for the intra image prediction mode.

Image processing device and image processing method

An information processing apparatus that decodes a coded stream includes a memory storing the coded stream, a decoder generating image data by decoding the coded stream stored in the memory, a memory-transfer controller controlling transfer so that the coded stream is transferred to the memory prior to timing for outputting the image data, and a decoding controller controlling decoding by the decoder so that, in the coded stream stored in the memory, a reference picture that is referred to in picture decoding is preferentially decoded.

Information processing apparatus and information processing method

A reproduction apparatus successively decoding and reproducing a plurality of picture data forming reproduced data, comprising a reproduction memory, a decoder decoding the picture data, writing the decoding results in the reproduction memory, and reproducing and outputting the decoding results read from the reproduction memory, and a processing circuit for performing decoding scheduling for determining an order of making the decoder decode picture data belonging to a group of picture data in units of groups of picture data comprised of a predetermined plurality of the picture data, generating scheduling result data including decoding order data indicating the determined order and validity data indicating validity of the picture data, selecting the picture data to be processed in the order determined by the decoding scheduling based on the scheduling result data, and, conditional on the selected picture data being valid, making the decoder decode and reproduce and output the picture data and, when receiving a reproduction rate change command, updating the validity data of the scheduling result data in accordance with the changed reproduction rate.

Reproduction apparatus, data processing system, reproduction method, program, and storage medium

The present invention enables a reduction in circuit scale. In an image coding apparatus (), as for DCT coefficients as simple coded data obtained by coding an input image () by simple processing, the input image () is coded by at least quantizing the input image () as an input image on the basis of selected quantization parameters (QPl) discretely selected from quantization parameters (QP) as quantization factors, thereby computing generated code sizes of the input image () upon coding. The image coding apparatus () corrects an error in the generated code sizes of the input image upon coding which occurs in accordance with the simple processing, thereby computing low-precision generated code sizes. The image coding apparatus () computes low-precision generated code sizes when the input image () is coded on the basis of quantization parameters (QP) other than the selected quantization parameters (QPl), by an interpolation process with respect to the low-precision generated code sizes when the input image () is coded on the basis of the selected quantization parameters (QPl).

Image processing apparatus and image processing method

The present invention can realize an image processing device and an image processing method that enable a simplified circuit configuration. An image encoding device () encodes an input image () in an ordinary process that is the same as main encoding on the basis of a predictive quantization parameter (QPd), while encoding the input image () in a simple manner (simplified process) on the basis of the predictive quantization parameter (QPd) and quantization parameters (QP) approximate to the predictive quantization parameter (QPd). The image encoding device () calculates a code quantity ratio R_reduction between a high-precision generated code quantity obtained through an ordinary process based on the predictive quantization parameter (QPd) and a generated code quantity obtained through a simplified process based on the predictive quantization parameter (QPd). The image encoding device () calculates high-precision generated code quantities based on the quantization parameters (QP) approximate to the predictive quantization parameter (QPd) on the basis of the code quantity ratio R_reduction and generated code quantities obtained through a simplified process based on the quantization parameters (QP) approximate to the predictive quantization parameter (QPd).

An information processing apparatus decodes compression-coded video data including I-pictures, P-pictures, and B-pictures. The information processing apparatus includes at least one decoder decoding the compression-coded video data, a supply controller controlling the supply of the compression-coded video data to the decoder, and a controller controlling processing executed by the supply controller and the decoder. The decoder includes a bank memory for storing decoded picture data, and the controller controls the timing at which a picture stored in the bank memory is released by changing the value of a first counter indicating a number of times for which the picture stored in the bank memory is referred to when a P-picture or a B-picture is decoded by the decoder.

To predict a target code amount from a code amount calculated on a single quantizer scale. The present invention stores relationship information on a plurality of pieces of quantized data for prediction having different MB generated code amounts on a fixed quantizer scale (QI) as prediction curves, the relationship information indicating a relationship between a plurality of quantizer scales (Q) representing a plurality of quantizer steps and MB generated code amounts. The present invention quantizes image data on a macroblock-by-macroblock basis on the single fixed quantizer scale (QI) out of the predetermined plurality of quantizer scales (Q), thereby generating temporary quantized data, and calculates the MB generated code amount of each macroblock unit of this temporary quantized data. The present invention then selects a piece of quantized data for prediction from the plurality of prediction curves based on the MB generated code amount of the temporary quantized data and the fixed quantizer scale (QI), and predicts the MB generated code amounts for situations when the image data is quantized on quantizer scales (Q) not selected by a quantization selection section, based on the selected piece of quantized data for prediction.

Image processing apparatus and method

To stop the decline of the quality of image associated with encoding. The present invention multiplies a decoding rescaling factor (RFr) possibly used in the decoding process by only a transformation matrix (D), which is scale change, to calculate a rescaling factor (RF), which is a plurality of division factors, and then calculates, for each detection unit, the sum (&#x3a3;Y) of evaluation values (Y) based on a residue (r) obtained as a result of dividing an element of a DCT coefficient by a plurality of rescaling factors (RF). Moreover, the present invention compares correlations of the sum (&#x3a3;Y) of the evaluation values (Y) with a plurality of rescaling factors (RF), and detects, based on the rescaling factor (RF) whose sum (&#x3a3;Y) of the evaluation values (Y) is a minimum value, a quantization factor used in the previous process of encoding the input image data.

The present invention can code an I-picture that satisfies a predetermined condition using parameter information. When it is determined at step Sthat a picture type is the I-picture, it is determined at step Swhether or not the phase of a macro block in previous coding agrees with that of the macro block of present coding. When the phases of the macro blocks agree with each other, it is determined at step Swhether or not amount of generated code in a unit of picture in decoding&#x2266;target amount of code&#xd7;&#x3b1; is satisfied. When the condition is satisfied, it is determined at step Swhether or not an image frame of previous coding is the same as that of previous coding. When the image frames are not the same, the information of a picture type, motion vector, and a quantized value included in the parameter information is reused, whereas when the image frames are the same, the stream data input to a decoder is output. When the above condition is not satisfied, the parameters are not reused. The present invention can be applied to a coder, a coding apparatus, an information recording apparatus, an information reproducing apparatus, or a transcoder.

Image processing apparatus and image processing method, information processing apparatus and information processing method, information recording apparatus and information recording method, information reproducing apparatus and information reproducing method, recording medium and program

A reusable quantization value Qref included in history information or parameter information is obtained in step S. In step S, it is judged whether or not the quantization value Qref obtained in step Sis smaller than a predetermined minimum quantization value Qmin. If it has been judged that the quantization value Qref is smaller than the predetermined minimum quantization value Qmin, the process proceeds to step S, where the quantization value Q is set at Qmin, and then the process is completed. If it has been judged that the quantization value Qref is not smaller than the predetermined minimum quantization value Qmin, the process proceeds to step S, where the quantization value Qref is reused and is set as the quantization value Q, and then the process is completed. The present invention can be applied to an SDTI CP-ASI converter or a long GOP encoder.

Growing community of inventors

Kanagawa, Japan

Shojiro Shibata