Color video signal processing device for enhancing at least one of a plurality of primary color signal components output from a color image pickup apparatus

Claim 1

A color video signal processing device for enhancing at least one of a plurality of primary color signal components output from a color image pickup apparatus having a photoelectric transducer section and a color stripe filter and producing a multiplex color signal, said multiplex color signal including a low frequency range signal containing first, second and third primary color signal components corresponding to additive primary colors, and a high frequency range signal having a carrier with a frequency dependent upon a pattern of arrangement of color stripes in the color stripe filter, said carrier being amplitude-modulated by said first and second primary color signal components which are predetermined by colors of the color stripes constituting the color stripe filter, said high frequency range signal containing a fundamental component and a harmonic component, said processing device comprising: terminal means for receiving the multiplex color signal; first separating means connected to said terminal means for separating the low frequency range signal out of the multiplex color signal; second separating means connected to said terminal means for separating the high frequency range signal out of the multiplex color signal; envelope detector means for detecting an envelope of the fundamental component of the high frequency range signal separated by said second separating means and generating an envelope detection output signal; subtractor means for generating a difference signal containing said third primary color signal component by subtracting the envelope detection output signal generated by said envelope detector means from the low frequency range signal separated by said first separating means; signal level setting means for respectively setting levels of said low frequency range signal separated by said first separating means and said envelope detection output signal generated by said envelope detector means to predetermined levels relative to each other such that when white light is incident to the color image pickup apparatus, said third primary color signal component contained in the difference signal generated by the subtracter means which is absent in the high frequency range signal is generated by said subtracter means with a predetermined polarity and an enhanced amplitude; third separating means for selectively separating the third primary color signal component contained in the difference signal generated by the subtracter means; and adder means for adding an output signal of said third separating means to the third primary color signal component contained in the low frequency range signal separated by said first separating means to enhance said third primary color signal component in amplitude.