Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1997-03-26
2001-03-20
Nguyen, Huy (Department: 2715)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C358S906000
Reexamination Certificate
active
06205286
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an image pickup apparatus and, more particularly, to an image pickup apparatus for generating a video signal encoded to compress an information amount of a photographed image.
A digitalizing technique of a video signal is being improved and a high efficient coding of a moving image is being performed. As an example of the conventional technique of such a coding algorithm, there is an interframe predictive coding for coding a difference between frames in the video signal. Such a coding relates to a coding system for reducing an information amount by using a correlation between adjacent frame images. Further, there is known a motion compensation interframe predictive coding to improve a coding efficiency of an image including a fast motion by adding a motion compensation to the above system.
Such a coding system is adopted in an MPEG (Moving Picture Expert Group) as coding standard specifications for digital storage, H.261 of the ITU-T (International Telecommunication Union-Telecommunication Standardization Sector) as coding standard for communication such as a television telephone, and the like. As for a method for encoding/decoding in accordance with the above specifications, they are disclosed in, for example, the magazine of The Institute of Television Engineers of Japan, Vol. 45, No. 7, pages 793 to 799 and 807 to 812, 1991.
In those conventional methods, however, since the signal is encoded by using the correlation between the frames, there is a problem such that image quality is deteriorated in the cases where the present image is different from the preceding image or where the motion is fast, where the frame correlation is low and the motion compensation is difficult, for example, the case where the operation such as switching of the scene (scene change), fading for gradually erasing the image, zoom, or the like is performed. With respect to a technique for solving such a problem, there is, for example, a technique disclosed in the magazine of The Institute of Television Engineers of Japan, Vol. 35, No. 10, pages 949 to 954, 1985. However, according to the technique disclosed in such reference, a circuit scale increases because the fading prediction is performed. In particular, in the case where such an encoding function is installed in an image pickup apparatus in which miniaturization is required, an increase in circuit scale causes a large problem.
SUMMARY OF THE INVENTION
It is a main object of the present invention to prevent a deterioration of an image quality even for an image having a low frame correlation.
Another object of the invention is to generate a high efficiently encoded (i.e., compressed) video signal by a simple circuit construction of a small scale.
Still another object of the invention is to record/reproduce an encoded (i.e., compressed) video signal.
Further another object of the invention is to digitally communicate an encoded (i.e., compressed) video signal through a transmitting circuit.
In order to solve the above problems, according to the present invention, there is provided an image pickup apparatus comprising: image pickup means for generating a digital video signal; control means for controlling the image pickup means; and image compression means for image compressing the digital video signal which is generated by the image pickup device, wherein the control means generates control information of the image pickup means and the image compression means changes encoding characteristics on the basis of the control information of the image pickup means.
The image pickup means executes a desired signal process to the image pickup signal and generates the digital video signal. The control means for controlling the image pickup means transmits a control signal corresponding to a photographing operation such as start and end of the photographing (scene change), zoom, an to move the camera to the right and left, tilt to vertically move the camera, fading, or the like to the image pickup means, thereby controlling the image pickup means. The image compression means interframe encodes the video signal that is output from the image pickup means and generates the compression signal. In this instance, the encoding characteristics are changed in accordance with the above photographing operation by using the control signal that is output from the control means.
As mentioned above, by encoding by using the control information of the image pickup means, a state which becomes a cause of the image quality deterioration such as a scene change or the like can be easily detected without using any complicated predicting means, so that the optimum encoding corresponding to the state can be performed. Due to this, an image pickup apparatus in which a deterioration of the image quality is small even for an image of a low frame correlation and a circuit scale is small can be realized.
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The Institute of Television Engineers of Japan vol. 45, No. 7 pp. 793 to 799 and 807 to 812.
The Institute of Television Engineers of Japan vol. 35, No. 10, pp. 949 to 954.
The Technical Report of The Institute of Television Engineers of Japan vol. 15, No. 7, pp. 43 to 48, 1991.
Aizawa Iwao
Imaide Takuya
Nishimura Ryuji
Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
Nguyen Huy
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