Video camera with aperture correction having reduced power consumption

A video camera having three image pickup devices each operating at a first clock frequency and in which a pixel of a respective one of three channels forming three analog primary color signals is spatially displaced from pixels of said other two channels by 1/2 pixel, comprising:

• means for converting said three analog primary color signals from said three image pickup devices into three digital primary color signals, said means for converting operating at said first clock frequency;
• aperture signal forming means for forming an aperture signal from at least one of said three digital primary color signals, said aperture signal forming means operating at a second clock frequency twice said first clock frequency;
• first adding means for adding said aperture signal to said three digital primary color signals;
• means for forming color difference signals and a first liminance signal from an output of said first adding means, said means for forming color difference signals operating at said first clock frequency;
• and
• second adding means for adding said aperture signal to said first luminance signal to produce a second luminance signal, said second adding means operating at said second clock frequency.

A video camera having three image pickup devices each having equal pixel pitch for providing three respective analog primary color signals each having a first clock frequency, one of said three image pickup devices being arrayed with a spatial shift of one half the pixel pitch with respect to the other two of said three image pickup devices, said video camera comprising:

• means for converting the analog primary color signal provided by said one image pickup device into a first digital primary color signal and for converting the other two analog primary color signals into second and third digital primary color signals, respectively;
• aperture signal forming means for forming an aperture signal having a second clock frequency from said first digital primary color signal and from at least one of said second and third digital primary color signals, said second clock frequency being twice said first clock frequency;
• means for down-sampling said aperture signal to produce a down-sampled aperture signal having said first clock frequency;
• means for adding said down-sampled aperture signal to said first, second and third digital primary color signals;
• and
• video signal forming means for forming a digital video signal of a predetermined format from an output of said means for adding.

A video camera having three image pickup devices each having equal pixel pitch for providing three respective analog primary color signals each having a first clock frequency, one of said three image pickup devices being arrayed with a spatial shift of one half the pixel pitch with respect to the other two of said three image pickup devices, said video camera comprising:

• means for converting the analog primary color signal provided by said one image pickup device into a first digital primary color signal and for converting the other two analog primary color signals into second and third digital primary color signals, respectively;
• aperture signal forming means for forming an aperture signal having a second clock frequency from said first digital primary color signal and from at least one of said second and third digital primary color signals, said second clock frequency being twice said first clock frequency;
• means for down-sampling said aperture signal to produce a down-sampled aperture signal having said first clock frequency;
• first adding means for adding said down-sampled aperture signal to said first, second and third digital primary color signals;
• video signal forming means for forming a first digital luminance signal and digital color difference signals from an output of said first adding means, said first digital luminance signal and said digital color difference signals having said first clock frequency;
• means for converting said first digital luminance signal having said first clock frequency to a second digital luminance signal having said second clock frequency;
• and
• second adding means for adding said aperture signal having said second clock frequency to said second digital luminance signal to produce an enhanced digital luminance signal.