Patent ID: 7071998

Claim:
A white balance regulating device, comprising: a cut-off value adjusting portion for adjusting and then outputting a cut-off value of an analog image signal which is input in the form of a first pattern; an A/D converter for converting the analog image signal, in which the cut-off value is adjusted, into a digital image signal; a detecting portion for detecting a least significant bit of each tristimulus value of the digital image signal; a controlling portion for upwardly regulating a level of a variable register of the cut-off value adjusting portion from a level corresponding to a preset first initial cut-off value until the least significant bit becomes different from the first initial cut-off value, and setting the level of the variable register just before the least significant bit becomes different from the first initial cut-off value as a first cut-off value; and a storing portion for storing the first cut-off value.