Image processor apparatus capable of updating reference data for determining similarity between features

An image processing apparatus for forming, in a memory, a judgment standard to be used for judging whether an input object is a specific object, said apparatus comprising;

• input means for inputting color image data corresponding to a color image;
• means for extracting color component data corresponding to the specific object from a selected part of the input color image data among the color image data;
• and
• means for forming a color distribution of the specific object in a selected part of the memory as the judgment standard, based on the extracted component data,
• wherein, the selected part of the input color image data is included in a two-dimensional area on said color image.