Processor for electronic endoscope and electronic endoscope system

A processor for an electronic endoscope, which acquires a captured image of a living tissue and performs enhancement processing, comprising:

• a region detection unit configured to detect an enhancement processing target region to be enhanced from pixel information of the captured image of the living tissue;
• and
• an enhancement processing unit configured to perform enhancement processing on the enhancement processing target region detected by the region detection unit,
• wherein the region detection unit is configured to repeat a candidate extraction process of extracting a focused pixel as a candidate for an enhancement processing target region when a signal level value of the focused pixel is smaller than signal level values of two farthest pixels located on both sides farthest from the focused pixel in any one of a plurality of pixel array directions in a region surrounded by a frame surrounding a region with the focused pixel as a center while changing a size of the frame, and to define the enhancement processing target region based on pixels extracted as the candidates by changing the size.