Processor for electronic endoscope, and electronic endoscope system

An electronic endoscope system comprising:

• an electronic endoscope processor comprising:
• a converting means for converting each of a plurality of pieces of pixel data that are made up of n types of color components and constitute a color image of a biological tissue in a body cavity into a piece of pixel data that is made up of m types of color components, n being a natural number greater than or equal to 3, m being a natural number greater than or equal to 2, and m being smaller than n;
• a correlation value calculating means for setting a reference axis that is related to a target illness and passes through a predetermined reference point in a color plane defined by the m types of color components, and, for each pixel of a plurality of pixels of the color image, calculating a correlation value with a predetermined reference state that is related to the target illness based on an angle formed by the reference axis and a line segment that connects the predetermined reference point and a pixel correspondence point corresponding to the pixel;
• and
• an evaluation value calculating means for integrating the correlation values calculated for the pixels, and setting a sum of the correlation values obtained by the integrating as an evaluation value that is related to the target illness;
• an electronic endoscope configured to generate data expressing the color image and output the data to the electronic endoscope processor;
• and
• a display apparatus configured to display the evaluation value obtained by the electronic endoscope processor.