JPH06225253A - Picture reproducing device - Google Patents

Abstract

PURPOSE:To efficiently record data with comparatively small capacity on a recording medium and to highly precisely reproduce a crucial scene (still picture) by linking display as the still picture with display as a moving picture. CONSTITUTION:In the string (0-n) of the frames 1 of the continuous and prescribed moving pictures, picture data of a 0-th frame 1 is highly precisely encoded by making the frame 1 efficient, and picture data of several subsequent frames are encoded by the compensation of movement between frames where a movement effect for reducing the grade of picture quality as a center. Highly efficient encoding as the still picture of the necessary frame 1 and encoding as the moving picture are recorded in the recording medium in accordance with the picture capacity of the frame 1. Thus, data quantity recorded in the recording medium is reduced. At the time of reproduction, the still picture recorded in the recording medium is reproduced in parallel to the reproduction of the moving picture. When the still picture is required, only the still picture is displayed, and the display of the moving picture is caused to stand by.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reproducing apparatus (image library system) for filing an input moving image and reproducing an image (for example, an image of a definitive screen) which meets necessary conditions.

[0002]

2. Description of the Related Art Conventionally, in this type of still image reproducing apparatus, an input moving image is recorded on a randomly accessible recording medium (laser disk or the like), and when reading the recorded image, an address is designated for each unit image. Thus, a required moving image can be arbitrarily reproduced.

At present, an input moving image is recorded on a recording medium as analog image data, and a method of recording the input moving image on the recording medium as digitized image data is being studied.

In general, the digitized image data has a larger data amount than the analog image data, and if it is attempted to record it as it is on a limited recording medium, the input moving image can be stored only for a short time. Therefore, the digitized image data is highly efficiently encoded to reduce the amount of the same image data, and the same input moving image can be stored in a recording medium with high efficiency.

[0005]

However, in the above still picture reproducing apparatus, when the digital image data of the input moving picture is highly efficiently encoded and recorded, the reproduced picture is deteriorated to some extent. In addition, the total capacity of the recording medium and the read data transfer rate of the recording medium are limited. For example, if the recording medium is a CD, it is about 1.5 MBPS, and an image quality comparable to VHS is realized by the image encoding system according to MPEG-I. This is the current situation.

[0006] In particular, in the above-described coded moving image, the content of the movement tends to be visually recognized due to the effect of the movement, but when it is stopped at a specific frame, only a very deteriorated still image can be obtained. Can not.

The present invention has been made in view of the above problems, and an object thereof is to improve the image of a specific frame by suppressing an increase in the data amount of encoded image data when recording and reproducing an input moving image. Another object of the present invention is to provide a still picture reproducing apparatus capable of recording and reproducing.

[0008]

In order to achieve the above object, the present invention is an image reproducing apparatus capable of recording and reproducing an input moving image, and a high-definition intra-frame code in which an image of a specific frame is used as a still image. The image of a predetermined number of frames subsequent to the specific frame is coded by motion compensation between frames, and the coding of the still image and the coding of the moving image are mixed to reduce the data amount. The gist is to minimize the increase and to be able to reproduce the image of the decisive screen of the input moving image with high definition.

[0009]

In the still picture reproducing apparatus having the above construction, the image data of the input moving image is coded at the time of recording and reproducing the input moving image, but the image data of the first frame of a certain moving image is highly efficient coded within the frame. Image data of a predetermined number of subsequent frames is encoded by motion compensation between frames. As a result, the amount of encoded data can be minimized, and the scene that is decisive for display can be rendered in high definition.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The still image reproducing apparatus of the present invention generally tends to follow movements when observing an image and tends to observe detailed information of the image, and particularly at a decisive moment of an input moving image (for example, a goal of a horse race). Since it tends to demand fine still images for (judgment photos), it is necessary to make the features of moving images compatible with the features of still images, and to minimize the increase in data amount when recording input moving images. Get information. For this reason, regarding frames of consecutive images, a specific frame is set as high-efficiency coding as a still image, and a predetermined number of subsequent frames are set as coding that emphasizes the motion effect as a moving image, and the high-efficiency coding and motion compensation are performed. By combining the encoding with, the amount of image data can be minimized, and important scenes can be displayed in high definition.

Next, the still picture reproducing apparatus according to the present invention will be described in detail with reference to FIG. 1. This still picture reproducing apparatus has a series (0 to n) of frames 1 of a predetermined continuous moving image. For example, the 0th frame (start frame) 1
Image data is encoded in high definition by high efficiency in the frame (encoding by JPEG; 640 × 480),
The image data of the following several frames (1st to nth) 1 is encoded (320 × 240) by motion compensation between frames centering on the motion effect of which the image quality grade is lowered.

The required high-efficiency coding of still image of frame 1 and coding of moving image as necessary are recorded on a recording medium (LD, CD, etc.) according to the image content of the same frame 1. As a result, the amount of data to be recorded on the recording medium becomes smaller than that in the case of highly efficient encoding within a frame.

By the way, when the intra-frame coding (image coding method) according to MPEG-I is used, it is usually 0.
There is a tendency for a fixed ratio such as every 5 seconds, and it is difficult to insert high-definition information of the image data of frame 1. Therefore, at the time of reproduction, the reproduction of the still image and the moving image recorded in the recording medium is executed in parallel, and only the still image is displayed when the still image is required, and the display of the moving image is waited, If there is a motion request, the display is changed to a moving image.

As described above, when recording and reproducing a moving image, the image data of a specific frame is encoded by a high-efficiency encoding method as a still image for the frames of consecutive images, and the image data of a predetermined number of subsequent frames. Is encoded with a moving image encoding method, and both encoding methods are mixed, so it is possible to display a decisive still image with high sensitivity while minimizing the increase in the data amount of the input image. You can

[0015]

As described above, according to the still image reproducing apparatus of the present invention, the display of a high-definition image as a still image and the display as a moving image are interlocked with each other, so that the data amount of a relatively small capacity can be obtained. Thus, it is possible to efficiently record on a recording medium and reproduce a definitive scene (still image) with high definition.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining an operation of a still image reproducing apparatus showing an embodiment of the present invention.

[Explanation of symbols]

 1 frame

Claims (1)

[Claims] 1. An image reproducing apparatus capable of recording and reproducing an input moving image, wherein an image of a specific frame is subjected to high-definition intra-frame encoding as a still image, and a predetermined number of frames following the specific frame are encoded. Image coding is performed by motion compensation between frames, the coding of the still image and the coding of the moving image are mixed, the increase of the data amount is minimized, and the decisive screen of the input moving image is displayed. An image reproducing device characterized in that an image can be reproduced in high definition.