Color image pickup apparatus for progressive scanning video signal

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 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 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 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.