Recognition device and recognition method

A recognition device for recognizing a state of a predetermined characteristic portion of a component to be mounted on a board, the recognition device comprising:

• a light source configured to apply light to the component including the predetermined characteristic portion;
• a camera configured to image the component that has received the light applied by the light source;
• and
• processing circuitry configured to perform image analysis of imaging data, which is captured by the camera and acquired from the camera, to recognize the state of the predetermined characteristic portion of the component,
• wherein the processing circuitry is configured to execute
• instruction processing of instructing the camera to image the component while changing a shutter speed of the camera between a predetermined lower limit speed and a predetermined upper limit speed,
• calculation processing of retrieving, from memory, a reference image of the predetermined characteristic portion and performing a pixel-by-pixel comparison of an image of the predetermined characteristic portion included in each of multiple images acquired from the camera in accordance with the instruction processing with the reference image to calculate a missing rate representing a proportion of pixels of the predetermined characteristic portion that are absent in each of the multiple images relative to corresponding pixels in the reference image,
• detection processing of detecting imaging data having a missing rate equal to or less than a predetermined first threshold among multiple missing rates calculated by the calculation processing, and
• selection processing of automatically selecting a shutter speed used for capturing the imaging data detected by the detection processing as an optimal shutter speed for subsequent imaging of the predetermined characteristic portion.