Television – Two-way video and voice communication – Display arrangement
Reexamination Certificate
2001-09-28
2003-09-09
Ramakrishnaiah, Melur (Department: 2643)
Television
Two-way video and voice communication
Display arrangement
C348S014130, C348S014010
Reexamination Certificate
active
06618072
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to a moving picture coding apparatus and a TV phone using the same.
2. Description of the Prior Art
Handwritten images are often transmitted in TV conferences and TV telephones.
FIG. 5
is a block diagram of a transmitting system of a TV phone with an input for handwritten images, while
FIG. 6
is a block diagram of receiving system of a TV phone with an output for handwritten images.
Voice signals from microphone
10
, moving pictures from camera
12
and handwritten images pen input
14
are coded by voice coding circuit
11
, moving picture coding circuit
13
and data coding circuit, respectively. These coded data are multiplexed by multiplexer
16
which is connected with a transmission channel.
The multiplexed data is demultiplexed by demultiplexer
17
. Then, the voice signals are decoded by voice decoding circuit
18
and outputted to speaker
19
, the moving pictures are decoded by moving picture decoding circuit
20
and outputted to moving picture monitor
21
, and the handwritten data are decoded by data decoding circuit
22
and outputted to handwritten image monitor
23
.
Both the transmitting and receiving system in the TV phone should share a data transmission protocol.
A moving picture signal may be combined with a handwritten image signal and decoded by moving picture coding means, as disclosed in JP 11-234639 A (1999).
FIG. 7
is a block diagram of a transmitting system of a TV phone. A moving picture from camera
12
and a handwritten image from pen input
14
are combined by combining circuit
31
into a combined image
33
which is coded by moving picture coding circuit
32
.
FIG. 8
is an example of image
42
by combining a moving picture
40
with a handwritten image
41
of which image size is adjusted.
However, it requires unnecessarily much calculations and electric power to code, by conventional method of coding moving pictures, the handwritten image almost all of which regions are still.
SUMMARY OF THE INVENTION
An object of the present invention is to code the handwritten image with less quantity of calculations and less electric power consumption in moving picture coding apparatus and TV phone using the same.
The moving picture coding apparatus of the present invention comprises a combining circuit for combining a moving picture with a handwritten image, a motion compensative moving picture coding circuit for coding all the moving picture and a newly added part in the handwritten image.
The motion compensative moving picture coding circuit codes only the newly inputted region, on the basis of information concerning a region already coded and a region newly inputted. According to the present invention, a quantity of calculation and power consumption of moving picture coding apparatus and TV phone using the same can be reduced, by coding only the newly inputted handwritten image.
Degradation of image quality can be further reduced by putting its motion vector “
0
”.
REFERENCES:
patent: 5448285 (1995-09-01), Kadowaki
patent: 5644660 (1997-07-01), Bruder
patent: 0 989 563 (2000-03-01), None
patent: 7-320056 (1995-12-01), None
patent: 8-23528 (1996-01-01), None
patent: 408046792 (1996-02-01), None
patent: 8-79721 (1996-03-01), None
patent: 8-205032 (1996-08-01), None
patent: 11-234639 (1999-08-01), None
patent: 11-341456 (1999-12-01), None
“Line Transmission of Non-Telephone Signals Video Coding for Low Bitrate Communication,” May 2, 1996, International Telecommunication Union, Draft Recommendation H.263, pp. 1-50, I.
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