Detection device and wearable device

A detection device comprising:

• a sensor area comprising a plurality of pixels arranged in a planar configuration;
• a light source configured to emit light to the sensor area;
• and
• a detection circuit configured to acquire periodically varying biometric information based on data acquired from the sensor area, wherein
• the detection circuit is configured to:
• generate first frequency domain data for each of the pixels by converting detection values of the pixel acquired in chronological order into signal strengths for respective frequencies;
• set a highest strength of the signal strengths corresponding to the respective frequencies of the first frequency domain data, as a first signal strength of each of the pixels;
• set an area in the sensor area where the first signal strength is equal to or higher than a predetermined value, as a first area;
• generate second frequency domain data in which a predetermined frequency range of the first frequency domain data of all the pixels in the first area is masked, based on the first frequency domain data of the pixels at an outer periphery of the first area;
• set a highest strength of the signal strengths corresponding to the respective frequencies of the second frequency domain data, as a second signal strength of each of the pixels;
• set an area in the sensor area where the second signal strength is equal to or higher than the predetermined value, as a second area;
• acquire the biometric information based on the second frequency domain data when a size of the second area is equal to or larger than a predetermined value;
• and
• acquire the biometric information based on the first frequency domain data when the size of the second area is smaller than the predetermined value.