A moving picture coding apparatus for performing inter-picture predictive coding for pictures constituting a moving picture is provided with a coding unit for performing predictive error coding for image data; a decoding unit for performing predictive error decoding for an output from the coding unit; a reference picture memory for holding output data from the decoding unit; and a motion vector detection unit for detecting motion vectors on the basis of the decoded image data stored in the memory. When coding a B picture as a target picture, information indicating whether or not the target picture should be used as a reference picture when coding another picture is added as header information. Therefore, in a decoding apparatus for decoding a bit stream Bs outputted from the moving picture coding apparatus, management of a memory for holding the reference picture can be facilitated on the basis of the header information.

Moving picture coding method and moving picture decoding method

A method of decoding a compressed video sequence, wherein image frames are entered into a buffer memory in connection with the decoding. The video sequence includes an indication relating to at least one discontinuity in the numbering of the image frames, which indication is decoded from the video sequence. Then, in response to the indication, the buffer memory is configured to provide a number of image frames corresponding to a discontinuity in the numbering of the image frames, and the image frames provided by the buffer memory are used in the decoding process. Preferably, said indication informs that at least one discontinuity in the numbering of the image frames in the video sequence are intentional, and the number of image frames provided by the buffer memory are used in place of image frames that do not exist at a decoder.

Grouping of image frames in video coding

An apparatus for recording and playing back digital data with variable length codes encoded from intra-frame compression data and inter-frame compression data. The apparatus includes a data rearranging circuit for rearranging the intra-frame compression data in the variable length encoded data, an address and a data length adding circuit for adding addresses and data length information of the intra-frame compression data which is output from the data rearrangement means.

Digital signal recording and playback apparatus for inter-frame and intra-frame compression data

An image encoder and its processing method for compression-encoding a dynamic image at a variable encoding rate in the case of an application required to perform real-time processing. A variable bit rate (VBR) control section (22) determines a VBR control quantizing scale VBRq according to a VBR buffer value held in a VBR buffer recording section (21). A constant bit rate (CBR) control section (23) determines a CBR control quantizing scale CBRq according to an inputted maximum bit rate BRmax. A quantizing scale comparing section (25) outputs the CBRq during constant rate encoding and outputs the larger one of the VBRq and CBRq during variable rate encoding. An image compression-encoding section (24) encodes the inputted image signal at a quantizing scale outputted from the quantizing scale comparing section (25) and outputs a bit stream (S20).

Image encoder and its method

A coding device includes a coding unit (740) for encoding an input digital signal using code words contained in one of a plurality of variable length code word groups, and a multiplexer (701) for generating a stream by generating a parameter (such as idr_pic_id) describing specific information about the stream, encoding the parameters, and adding it to the output data from the coding unit. The length of the code words contained in any single variable length code word group is the same. The multiplexer selects one variable length code word group containing three or more code words out of the plural groups, and codes the parameter using one code word selected from the code words contained in the selected group.

Coding device and editing device

PURPOSE:To obtain a reproduced picture in which a picture varies at every frame by compressing and encoding separately the low frequency band component of the picture signal of one frame, and reproducing only this low frequency band component at the time of special reproduction such as searching and the like. CONSTITUTION:A restored picture P1 obtained by encoding the encoded data F1, LL of a signal LL in data F1 is displayed on a monitor device repeatedly during 2 frames time. The restored picture P6 corresponding to the low frequency band component of the data F6 is displayed during 1-frame time, and further, the restored picture P11 corresponding to the low frequency band component of the data F11 is displayed during 1-frame time. Thus, the encoded data of the low frequency band component LL can be reproduced in about 1-frame time. Thus, the restored picture which varies at nearly every frame time can be obtained at the time of searching operation.

Recordor for picture signal

PURPOSE: To rightly restore the encoded image data after an edition is performed by preventing the image for which a second inter-encoding is performed from being outputted by using the image belonging to an original preceding group as a predicted image when an edition flag is set. CONSTITUTION: By using the image belonging to an original preceding group as a predicted image, an edition flag SLPG is set to the group including the encoded data corresponding to the image for which a second inter-encoding which is possible to use the images existing before and after in the time in a display order as predicted images is performed. A frame order reverse rearranging circuit 90 executes the processing rearranging from the frame order according to a decoding processing to the frame order based on an inut image signal and executes an edition reproduction processing by referring to the edition flag SLPG. Namely, when the edition flag SLPG is set, the image belonging to the original preceding frame group is used as the the predicted image, an interpolation frame is not outputted, the intraframe encoded just before is outputted and an encoding is performed.

Encoded data decoding method and device

PURPOSE: To prevent the deterioration of the image quality when the image after an edition is performed is reproduced by performing an edition processing for the image encoded data obtained by encoding image signals by dividing the signals into plural groups including plural frames. CONSTITUTION: In the video signal encoding method encoding the video signal composed of plural continuous sheets of frames, any of intraframes A1, A9, ..., predicted frames B3, B5, ... in which only the images existing before in the time in a display order are possible to be used as predicted images and interpolation frames C2, C4, ... in which the images existing before and after in the time in the display order are possible to be used as predicted images is assigned to each frame of the video signals, the signals corresponding to a prescribed frame number are grouped and encoded as a frame group, interporation predictions are performed for the interpolation frames C2, C4, ...by using only the intrafrane or predicted frame within the same frame group, and the relation of each frame is made to be completed within the frame group.

Video signal encoding method and video signal recording medium

PURPOSE:To detect a moving vector with high accuracy in the unit of picture elements or below by detecting an optimum moving position in the unit of picture elements and detecting the optimum moving position based on the result of detection and the result of comparison between a reproduced moving picture and a current moving picture. CONSTITUTION:A minimum value of result of comparison DADD with respect to a current moving picture when a one preceding frame reproduced moving picture is moved sequentially in the unit of picture elements is detected by an arithmetic processing circuit 9. Thus, the moving position formed with a picture most similar to the current moving picture while the one preceding frame reproduced moving picture is moved sequentially in the unit of picture elements is detected in the unit of picture elements. Moreover, a sum data DADD smaller next to the minimum value is detected from the comparison result DADD and the direction of the optimum moving position is detected. Moreover, the arithmetic processing is executed based on 3 sum data DADD values y0, y1 and y-1. Thus, the optimum moving position is detected with accuracy in the unit of picture elements or below and the moving vector is detected with high accuracy.

Movement detection circuit

PURPOSE:To uniform the picture quality of high-efficiency encoded data by controlling the amounts of intra-frame encoded data and inter-frame encoded data. CONSTITUTION:High-efficiency encoded block data BLNX of one block are generated by performing quantization so that 1st high-efficiency encoded data D1X consisting of the intra-frame encoded data and 2nd high-efficiency encoded data D2X-D10X consisting of the inter-frame encoded data following the 1st high-efficiency encoded data D1X are arrayed in order. Then the allocation quantity of the 1st high-efficiency encoded data D1X and 2nd high-efficiency encoded data D2X-D10X is so controlled that the picture quality of the 1st high-efficiency encoded data D1X and 2nd high-efficiency encoded data D2X-D10X is uniform. Consequently, the picture quality of the intra-frame encoded data and inter-frame encoded data can be uniformed.

Method and device for encoding video signal

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