IMAGE SIGNAL PROCESSING DEVICE FOR MINIMIZING FALSE SIGNALS AT COLOR BOUNDARIES

An image signal processing device of the present invention includes an RGB-YC conversion for converting color component signals output from a CCD (Charge Coupled Device) image sensor to luminance signals and components thereof lying in a high frequency range. The luminance signals and their components lying in a high frequency range are fed to a first, a second and a third low pass filter (LPF), respectively. Luminance signals output from a third LPF are fed to an adder while components lying in a high frequency range are fed from the first LPF to a selector. Further, the components output from the second LPF are fed to the selector via a resolution correcting section. The selector selects either one of the two different kinds of components input thereto. The adder adds the luminance signals output from the third LPF and the components selected by the selector and thereby outputs second luminance signals. A false signal reducing section reduces false signals contained in the second luminance signals and appearing at horizontal color boundaries and feeds the resulting luminance signals to a contour correcting section. With this configuration, the device is capable of reducing false signals appearing at horizontal color boundaries.