Image analysis – Image compression or coding – Interframe coding
Reexamination Certificate
1995-07-03
2001-06-26
Chen, Wenpeng (Department: 2624)
Image analysis
Image compression or coding
Interframe coding
C375S240250, C375S240010, C345S097000
Reexamination Certificate
active
06252991
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an image processing apparatus for displaying an image by a display apparatus in accordance with encoded image data.
2. Related Background Art
The use of a liquid crystal device having bistability has been proposed by Clark and Lagerwall (U.S. Pat. No. 4,367,924, etc.). A driving system of a display panel using such a liquid crystal has been proposed in, for example, U.S. Pat. No. 4,655,561.
According to such a driving system, when one scan line is selected, it is necessary to apply a pulse of one or another polarity having a peak value and a pulse width enough to certainly cause one or another orientation state of the bistable orientation states. For example, assuming that one scan line selection time is equal to 150 &mgr;sec, one vertical scan time (one frame scan time) in case of 400 scan lines is equal to 60 msec and a frame frequency is equal to 16.7 Hz. Further, the frame frequency decreases with an increase in number of scan lines.
Therefore, to display a moving image at a predetermined frame rate, it is necessary to reduce the number of lines to be scanned in one frame.
SUMMARY OF THE INVENTION
It is, therefore, an object of the invention to efficiently detect a changed portion for a previous picture plane from image data encoded by using a correlation of a plurality of picture planes, thereby enabling a partial image display in a display apparatus to be changed.
To accomplish the above object, according to the invention, there is provided an image processing apparatus comprising: detecting means for detecting a changed portion for a previous picture plane from image data encoded by using a correlation of a plurality of picture planes; and output means for outputting the image data of the portion detected by the detecting means to a display apparatus.
Another object of the invention is to prevent a deterioration of a display image in a display apparatus by executing a refreshing operation at a timing for displaying an intra-image.
To accomplish the above object, according to the invention, there is provided an image processing apparatus for controlling a display apparatus for displaying an image in accordance with image data encoded by using a correlation of a plurality of picture planes, wherein the display apparatus is allowed to execute a refreshing operation at a timing for displaying the image data which was intra-frame encoded in the above image data.
The above and other objects and features of the present invention will become apparent from the following detailed description and the appended claims with reference to the accompanying drawings.
REFERENCES:
patent: 4367924 (1983-01-01), Clark et al.
patent: 4655561 (1987-04-01), Kanbe et al.
patent: 5091723 (1992-02-01), Kanno et al.
patent: 5150432 (1992-09-01), Ueno et al.
patent: 5377051 (1994-12-01), Lane et al.
patent: 5436636 (1995-07-01), Nonoshita et al.
patent: 5565921 (1996-10-01), Sasaki et al.
patent: 5977945 (1999-11-01), Ohshima
Uchio Hirokazu
Yoshida Tadashi
Canon Kabushiki Kaisha
Chen Wenpeng
Fitzpatrick ,Cella, Harper & Scinto
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