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Image data reproducing device and method

A technology of image data and reproducing devices, which is applied in the direction of image communication, TV, color TV parts, etc., and can solve the problems that images cannot be displayed at a normal speed, images are missing, and take a long time.

Inactive Publication Date: 2004-02-04
SONY CORP
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Problems solved by technology

[0005] It should be noted here that in the case where data is reproduced at half, quarter, ... of the normal speed, or in the case where so-called variable speed reproduction including frame advance etc. The technique defined by MPEG has no advantage in that there will be dropouts in the picture being displayed due to speed variations
Also, since the image cannot be displayed at normal speed until the recording medium reproduction is completely switched to normal speed reproduction, it takes a long time before the user can actually view the image reproduced at the desired speed. take a long time

Method used

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Embodiment Construction

[0029] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] The image data reproducing apparatus according to the present invention is applied to an image recorder / player denoted by reference 1 which converts Image data is recorded to a recording medium or a moving image is reproduced from a recording medium. Such as figure 1 As shown, the image recorder / player 1 includes: a recording system 10 for recording compressed image data to a recording medium 4; and a reproduction system 30 for expanding or decompressing image data read from the recording medium 4 . Note that the recording medium 4 is a magnetic disk or disc for recording such as image and audio data.

[0031] Recording system 10 comprises: MPEG compressor 11, DRAM 12, DRAM read controller 13, recording medium controller 14, STC (system time clock) generator 15, ETN (extended track number) adder 16, audio frequency compression 17, mixer 18 and...

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Abstract

In an STC generating step, STCs (STC_d) delayed a time 'System_delay' from STC (STC_medium) in compressed picture data read from a recording medium in the normal-speed reproduction mode is sequentially generated. In this STC generating step, there is set at shift from a variable-speed reproduction to normal-speed reproduction an STC initial value on the basis of results of comparison between PTS (PTS_s) in display picture data at the time of reproduction mode shift and {STC_medium at the shift-(delay due to the shift (shift_delay)+System_delay)}. Thus, when shifting the reproduction mode from a variable-speed one to normal-sped one in compliance with the MPEG standard, pictures can smoothly be displayed in the normal-speed reproduction mode without skipping over any displayed pictures.

Description

technical field [0001] The present invention relates to an image data reproducing apparatus and method suitable for reproducing image data encoded in accordance with the MPEG (Moving Picture Experts Group) standard by decoding the data. Background technique [0002] Recently, various digital image encoding technologies typified by MPEG-2 (ISO / IEC 13818) have been proposed to compress images by encoding. Image compression according to the MPEG standard is performed by quantizing and variable-length coding a signal resulting from a hybrid transform which is a combination of interactive image motion displacement compensation and DCT (Discrete Cosine Transform). [0003] According to the MPEG standard, picture planes (frames or fields) contained in a picture are compressed by encoding them into any one of picture types including I, P and B pictures. An I-picture is an intra-frame predictive coded picture or an intra-coded picture. It is an image that is predictively coded with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/76H04N5/783H04N5/92H04N5/93H04N9/804
CPCH04N5/783H04N21/44004H04N21/440281H04N9/8042H04N5/92
Inventor 山崎健治后藤康博阿部文善下村宗弘
Owner SONY CORP
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