Patent ID: 7358993

Claim:
A digital still camera apparatus comprising: image pick-up means; an electronic shutter; lens aperture means; smear detection means which detects a smear in an image signal from said image pick-up means; electronic shutter speed measurement and control means with respect to said electronic shutter; lens aperture value measurement and control means with respect to said lens aperture means; automatic exposure adjustment control means which controls said electronic shutter speed measurement and control means and said lens aperture value measurement and control means; automatic gain control means which controls a gain of the image signal from said image pick-up means automatically; first color information integral value measurement means which measures first color information integral values of red, green and blue respectively in a predetermined color measurement area of an effective pixel region of said image pick-up means under the condition that said automatic exposure adjustment control means is fixed, with measuring a first electronic shutter speed of said electronic shutter and a first lens aperture value of said lens aperture means by said electric shutter speed measurement and control means and said lens aperture value measurement and control means, when the smear is detected by said smear detection means; second color information integral measurement means which measures second color information integral values of said red, green and blue respectively in said color measurement area under the condition that said automatic exposure adjustment control means is fixed, making the electronic shutter speed of said electronic shutter increase to a predetermined amount by said electronic shutter speed measurement and control means to obtain the same exposure amount as the exposure amount of said first electronic shutter speed and said first lens aperture value, so that the lens aperture of said lens aperture means is widened to that amount by said lens aperture value measurement and control means, in the condition that a gain of said automatic gain control means is fixed; and smear amount calculation means which calculates a smear amount by said first and second color information integral values of said red, green and blue from said first and second color information integral value measurement means.