Endoscope processor and endoscope system

A processor for an endoscope, comprising:

• an image processing unit configured to obtain a severity of a lesion representing a degree of progression of a lesion of a biological tissue by one value from an image of a lesion part of the biological tissue obtained by an electronic endoscope configured to image the biological tissue in a body cavity, using at least information on the image,
• wherein the image processing unit includes
• a feature amount calculation unit configured to calculate, for each pixel from the image, a first pixel evaluation value indicating a degree of a first feature regarding a first color component indicated by the lesion part or a shape of the lesion part, the first pixel evaluation value being a pixel evaluation value corresponding to the first feature being capable of distinguishing the first feature of appearance appearing in the lesion part from a feature of a healthy part of the biological tissue by the first color component or the shape of the lesion part,
• a representative value calculation unit configured to calculate a first representative evaluation value of the first feature of the biological tissue by collecting the first pixel evaluation values of the respective pixels in the image, and
• an integration unit configured to calculate severity of the lesion based on at least the first representative evaluation value by adjusting an influence degree of the first representative evaluation value indicating a change in the severity with respect to a change in the first representative evaluation value based on at least information on a second color component of the image different from the first color component or based on at least a second representative evaluation value obtained by collecting second pixel evaluation values indicating a degree of another second feature different from the first feature.