Television – Image signal processing circuitry specific to television – Chrominance-luminance signal separation
Reexamination Certificate
1997-10-30
2001-07-24
Eisenzopf, Reinhard J. (Department: 2614)
Television
Image signal processing circuitry specific to television
Chrominance-luminance signal separation
C348S663000, C348S234000, C348S222100, C348S450000
Reexamination Certificate
active
06266101
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to the field of color image signal processing. In particular, the present invention relates to a Y/C separator which generates a luminance signal and a chrominance (color difference) signal of a sequential scanning system on the basis of an image signal of an interlaced scanning system, and to a camera comprising such a Y/C separator.
2. Description of the Related Art
In case of generating a luminance signal and a color difference signal on the basis of an image signal outputted from an image pick-up device, such as a CCD or the like, a Y/C separation circuit (Y: Luminance signal, and C: Color difference signal) is used. The Y/C separation circuit includes a circuit which simply generates a luminance signal and a color difference signal, and, additionally, for example, a circuit provided with a function which receives an image signal of an interlaced scanning system and generates a luminance signal and a color difference signal of a sequential scanning system. Up to now, conversion from an interlaced scanning system to a sequential scanning system has been realized, for example, by twice repeating the scanning of each of the scanning lines forming an odd field.
There is a possibility that a moving image will be displayed in a distorted state when displaying by simply repeatedly using each scanning line. To display, repeatedly, the same scanning line, means that scanning lines having the same content are disposed in parallel with one another, and this causes deterioration in the resolution in the vertical direction.
SUMMARY OF THE INVENTION
It is an object of the present invention provide a Y/C separator capable of avoiding distortion of an image and deterioration of the resolution in the vertical direction.
The present invention makes substantially all scanning lines different in content from one another without repeating one scanning line. Due to this, distortion of an image and deterioration of the resolution in the vertical direction which have been generated in case of repeating each scanning line, can be avoided.
Those skilled in the art will understand the invention and additional objects and advantages of the invention by studying the description of preferred embodiments below with reference to the following drawings which illustrate the features of the appended claims.
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Eisenzopf Reinhard J.
Goodman Edward W.
Natnael Paulos
U.S. Philips Corporation
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