Image analysis – Color image processing
Reexamination Certificate
1999-10-28
2003-02-04
Tran, Phuoc (Department: 2621)
Image analysis
Color image processing
C382S224000, C348S441000, C348S453000
Reexamination Certificate
active
06516088
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relats to an image information converting apparatus for performing an image information conversion for example a composite—component conversion for a television receiver or the like.
2. Description of the Related Art
In a conventional composite—component conversion, a composite color image signal such as an NTSC (National Television System Committee) signal is separated into a Y signal (luminance signal) and a C (chrominance) signal by a Y/C separating circuit. Thereafter, the C signal is color-demodulated to component signals Y, R-Y, and B-Y as base band signals. To obtain primary color RGB signals from the Y, R-Y, and B-Y component signals, it is necessary to perform a matrix process.
Next, with reference to
FIG. 1
, the overall structure of a conventional NTSC television receiver will be described. A reception antenna
201
receives a radio wave. A signal based on the received radio wave is supplied to a tuner
202
. The tuner
202
selects a signal of a desired channel from the received signal and amplifies the signal of the desired channel. The amplified signal is supplied to an intermediate frequency amplifying circuit
203
. The intermediate frequency amplifying circuit amplifies the received signal, generates an NATS signal with a gain properly adjusted, and supplies the NTSC signal to a Y/C separating circuit
204
.
The Y/C separating circuit
204
separates the received NTSC signal into a Y signal (luminance signal) and a C (chrominance) signal. The C signal is supplied to a chrominance signal demodulating circuit
205
. The Y signal is supplied to a matrix circuit
206
. The chrominance signal demodulating circuit
205
color-demodulates the C signal and generates component signals R-Y and B-Y as base band signals. The generated component signals R-Y and B-Y are supplied to the matrix circuit
206
. The matrix circuit
206
performs a matrix process for the received component signals R-Y and B-Y and generates primary color signals R, G, and B. The generated primary color signals R, G, and B are supplied to a CRT (Cathode Ray Tube)
207
.
In the structure shown in
FIG. 1
, an NTSC signal as a composite image signal is processed by the Y/C separating circuit
204
, the chrominance signal demodulating circuit
205
, and the matrix circuit
206
so as to obtain primary color signals R, G, and B. Thus, the circuit scale of the television receiver shown in
FIG. 1
is large. In addition, the image quality tends to deteriorate due to an operation error of the Y/C separating circuit. For example, a dot disturbance and a cross color take place at for example an edge of an image and a moving image section.
OBJECTS AND SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide an image information converting apparatus that allows the circuit scale to be reduced and the image quality to be prevented from deteriorating.
A first aspect of the present invention is a converting apparatus for converting a composite color image signal having a plurality of pixels into a component color image signal composed of a plurality of components, comprising a class determination pixel extracting section for extracting a pixel at a considered point and a plurality of pixels with the same phase as the pixel at the considered point from the component color image signal, a class determining section for determining the class of the considered point based on the difference between the pixel value of the pixel at the considered point and the pixel value of each of the plurality of pixels with the same phase, and an image converting section for converting the composite color image signal into the component color image signal based on the class of the considered point determined by the class determining section.
A second aspect of the present invention is a converting method for converting a composite color image signal having a plurality of pixels into a component color image signal composed of a plurality of components, comprising the steps of (a) extracting a pixel at a considered point and a plurality of pixels with the same phase as the pixel at the considered point from the component color image signal, (b) determining the class of the considered point based on the difference between the pixel value of the pixel at the considered point and the pixel value of each of the plurality of pixels with the same phase, and (c) converting the composite color image signal into the component color image signal based on the class of the considered point determined by the class determining section.
A third aspect of the present invention is a converting apparatus for converting a composite color image signal having a plurality of pixels into a component color image signal composed of a plurality of components, comprising a class determination pixel extracting means for extracting a pixel at a considered point and a plurality of pixels with the same phase as the pixel at the considered point from the component color image signal, a class determining means for determining the class of the considered point based on the difference between the pixel value of the pixel at the considered point and the pixel value of each of the plurality of pixels with the same phase, and an image converting means for converting the composite color image signal into the component color image signal based on the class of the considered point determined by the class determining means.
These and other objects, features and advantages of the present invention will become more apparent in light of the following detailed description of a best mode embodiment thereof, as illustrated in the accompanying drawings.
REFERENCES:
patent: 4882625 (1989-11-01), Akiyama
patent: 5049990 (1991-09-01), Kondo et al.
patent: 5526060 (1996-06-01), Raby
patent: 5889562 (1999-03-01), Pau
patent: 07-099666 (1995-04-01), None
patent: 07-250344 (1995-09-01), None
patent: 07-288842 (1995-10-01), None
patent: 10-013856 (1998-01-01), None
patent: 10-066031 (1998-03-01), None
patent: 10-084559 (1998-03-01), None
patent: 10-150674 (1998-06-01), None
Chikaoka Shizuo
Hoshino Takaya
Inoue Satoshi
Kondo Tetsujiro
Nakaya Hideo
Frommer William S.
Frommer & Lawrence & Haug LLP
Tran Phuoc
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