Abstract: A digital camera apparatus has an analog emphasis circuitry arranged such that when an output from a charge-coupled device (CCD) forming the imager and cooperating with a complementary color, checkered pattern filter is processed in a digital fashion, an analog carrier chrominance signal component is emphasized before being converted to a digital signal, thus making it possible to reduce adverse influence caused by quantization noise.

Abstract: A noise reduction circuit comprises a high pass filter for extracting a signal component containing noise from an input signal, a variable level limiter for limiting the level of the signal component extracted by the filter to produce a noise suppressing signal, and a level adjustor for adjusting the level of the noise suppressing signal. A level detector detects the level of the input signal, and a control signal generator generates first and second control signals based on the detected output of the level detector, supplies the first control signal to the level limiter so as to control the limit level thereof, and supplies the second control signal to the level adjustor so as to control the gain thereof. In a signal subtracter, the noise suppressing signal from the level adjustor is added with reversed polarity to the input signal to suppress the noise contained in the input signal and thereby produce a low-noise output signal.

Abstract: A color signal matrix circuit for producing first and second color difference signals from three primary color signals employs a reduced number of digital circuit elements and includes a first subtractor for producing a first color subtraction signal based on red and green primary color signals, a second subtractor for producing a second color subtraction signal based on blue and green primary color signals, a first level adjuster receiving the first color subtraction signal, a second level adjuster with a variable level factor receiving the second color subtraction signal, a third subtractor receiving the first color subtraction signal from the first level adjuster and the second color subtraction signal from the second level adjuster for producing the first color difference signal, and a third level adjuster receiving the second color subtraction signal, a fourth level adjuster with a variable level factor receiving the first color subtraction signal, and a fourth subtractor supplied with the second color s