Television – Camera – system and detail – With single image scanning device supplying plural color...
Reexamination Certificate
1998-04-27
2001-08-07
Garber, Wendy R. (Department: 2612)
Television
Camera, system and detail
With single image scanning device supplying plural color...
C348S237000, C348S446000, C348S713000, C358S515000
Reexamination Certificate
active
06271881
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a color image pickup apparatus or a color camera apparatus.
2. Description of the Related Art
A known color CCD (charge-coupled device) camera includes a two-dimensional array of photosensitive diodes, and a checkered color separation filter extending in front of the photosensitive diode array, and a CCD array connected to the photosensitive diode array.
Japanese published unexamined patent application 7-7733 discloses such a color CCD camera. The camera of Japanese application 7-7733 is designed for interlaced scanning. Thus, in the camera of Japanese application 7-7733, a color separation filter has a pattern suited to interlaced scanning.
If a prior-art combination of a photosensitive diode array, a CCD array, and a color separation filter designed for interlaced scanning is driven in a progressive scanning procedure, a vertical-direction color resolution provided by a resultant image-representing signal tends to be significantly decreased.
SUMMARY OF THE INVENTION
It is an object of this invention to provide an improved color image pickup apparatus which operates in a progressive scanning procedure.
A first aspect of this invention provides a color image pickup apparatus comprising a photo-to-electric conversion section subjected to progressive scanning; a first delay circuit for delaying an output signal of the photo-to-electric conversion section; a first adder for adding the output signal of the photo-to-electric conversion section and an output signal of the first delay circuit; a second delay circuit for delaying the output signal of the first delay circuit; a second adder for adding the output signal of the photo-to-electric conversion section and an output signal of the second delay circuit; a third delay circuit for delaying an output signal of the first adder; a first subtracter for implementing subtraction between the output signal of the first adder and an output signal of the third delay circuit; a fourth delay circuit for delaying an output signal of the second adder; a second subtracter for implementing subtraction between the output signal of the second adder and an output signal of the fourth delay circuit; a first sign change circuit for inverting a sign of an output signal of the first subtracter; a first selector for periodically and alternately selecting one of the output signal of the first subtracter and an output signal of the first sign change circuit; a second sign change circuit for inverting a sign of an output signal of the second subtracter; a second selector for periodically and alternately selecting one of the output signal of the second subtracter and an output signal of the second sign change circuit; and means for generating two different color-difference signals in response to an output signal of the first selector and an output signal of the second selector.
A second aspect of this invention provides a color image pickup apparatus comprising a photo-to-electric conversion section subjected to progressive scanning; a first delay circuit for delaying an output signal of the photo-to-electric conversion section; a first adder for adding the output signal of the photo-to-electric conversion section and an output signal of the first delay circuit; a second delay circuit for delaying the output signal of the first delay circuit; a second adder for adding the output signal of the photo-to-electric conversion section and an output signal of the second delay circuit; a third delay circuit for delaying the output signal of the photo-to-electric conversion section; a third adder for adding the output signal of the first delay circuit and an output signal of the third delay circuit; a fourth delay circuit for delaying an output signal of the first adder; a first subtracter for implementing subtraction between the output signal of the first adder and an output signal of the fourth delay circuit; a second subtracter for implementing subtraction between an output signal of the second adder and an output signal of the third adder; a first sign change circuit for inverting a sign of an output signal of the first subtracter; a first selector for periodically and alternately selecting one of the output signal of the first subtracter and an output signal of the first sign change circuit; a second sign change circuit for inverting a sign of an output signal of the second subtracter; a second selector for periodically and alternately selecting one of the output signal of the second subtracter and an output signal of the second sign change circuit; and means for generating two different color-difference signals in response to an output signal of the first selector and an output signal of the second selector.
A third aspect of this invention provides a color image pickup apparatus comprising a photo-to-electric conversion section subjected to progressive scanning; a first delay circuit for delaying an output signal of the photo-to-electric conversion section by a time equal to one horizontal scanning period; a first adder for adding the output signal of the photo-to-electric conversion section and an output signal of the first delay circuit; a second delay circuit for delaying the output signal of the first delay circuit by a time corresponding to one pixel; a second adder for adding the output signal of the photo-to-electric conversion section and an output signal of the second delay circuit; a third delay circuit for delaying an output signal of the first adder by a time corresponding to one pixel; a first subtracter for implementing subtraction between the output signal of the first adder and an output signal of the third delay circuit; a fourth delay circuit for delaying an output signal of the second adder by a time correspond to one pixel; a second subtracter for implementing subtraction between the output signal of the second adder and an output signal of the fourth delay circuit; a first sign change circuit for inverting a sign of an output signal of the first subtracter; a first selector for periodically and alternately selecting one of the output signal of the first subtracter and an output signal of the first sign change circuit; a second sign change circuit for inverting a sign of an output signal of the second subtracter; a second selector for periodically and alternately selecting one of the output signal of the second subtracter and an output signal of the second sign change circuit; and means for generating two different color-difference signals in response to an output signal of the first selector and an output signal of the second selector.
A fourth aspect of this invention provides a color image pickup apparatus comprising a photo-to-electric conversion section subjected to progressive scanning; a first delay circuit for delaying an output signal of the photo-to-electric conversion section by a time equal to one horizontal scanning period; a first adder for adding the output signal of the photo-to-electric conversion section and an output signal of the first delay circuit; a second delay circuit for delaying the output signal of the first delay circuit by a time corresponding to one pixel; a second adder for adding the output signal of the photo-to-electric conversion section and an output signal of the second delay circuit; a third delay circuit for delaying the output signal of the photo-to-electric conversion section by a time corresponding to one pixel; a third adder for adding the output signal of the first delay circuit and an output signal of the third delay circuit; a fourth delay circuit for delaying an output signal of the first adder by a time corresponding to one pixel; a first subtracter for implementing subtraction between the output signal of the first adder and an output signal of the fourth delay circuit; a second subtracter for implementing subtraction between an output signal of the second adder and an output signal of the third adder; a first sign change circuit for inverting a sign of an output signal of the first subtracter; a first selector
Kanazawa Atsuto
Kariya Masaki
Kobayashi Kikuo
Nakayama Masaaki
Serizawa Masayuki
Connolly Bove & Lodge & Hutz LLP
Garber Wendy R.
Matsushita Electric - Industrial Co., Ltd.
Vu Ngoc-Yen
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