Biometric detection module with denoising function and biometric detection method thereof

A biometric detection module, configured to detect at least one biometric characteristic from a skin region in a concha, the biometric detection module comprising:

• a detection unit comprising:
• a light source module configured to emit green light, red light and infrared light in a time division manner to illuminate the skin region;
• a detection region configured to detect penetrating light emitted from the light source module for illuminating the skin region and passing through body tissues to correspondingly generate a green light signal, a red light signal and an infrared light signal;
• and
• at least one processor configured to
• control the light source module to emit light,
• convert the green light signal to frequency domain to determine a filtering parameter according to a frequency domain green light signal,
• respectively convert the red light signal and the infrared light signal to a frequency domain red light signal and a frequency domain infrared light signal,
• filter the frequency domain red light signal and the frequency domain infrared light signal using the filtering parameter determined from the frequency domain green light signal, to obtain a filtered red light signal and a filtered infrared light signal, and
• calculate the biometric characteristic according to at least one of the green light signal, the filtered red light signal and the filtered infrared light signal;
• and
• an abrasion-proof layer covering the detection region and having an upper surface as a detection surface, wherein
• a thickness of the abrasion-proof layer is smaller than 100 micrometers, and
• the upper surface is configured to be in contact with the skin region when detecting the biometric characteristic such that the light emitted from the light source module illuminates the skin region and sequentially passes through the body tissues and the abrasion-proof layer to be detected by the detection region.

A biometric detection method of a biometric detection module, the biometric detection module comprising a light source module, an abrasion-proof layer and a detection region and configured to detect at least one biometric characteristic from a skin surface, wherein the abrasion-proof layer covers the detection region, has an upper surface as a detection surface and has a thickness smaller than 100 micrometers, and the upper surface is in contact with the skin surface when detecting the biometric characteristic, the biometric detection method comprising:

• emitting, using the light source module, green light, red light and infrared light in a time division manner to illuminate the skin surface;
• detecting, using the detection region, penetrating light emitted from the light source module for illuminating the skin surface and sequentially passing through body tissues and the abrasion-proof layer to correspondingly generate a green light signal, a red light signal and an infrared light signal;
• converting the green light signal to frequency domain and determining a filtering parameter according to a frequency domain green light signal;
• converting the red light signal and the infrared light signal respectively to a frequency domain red light signal and a frequency domain infrared light signal;
• filtering the frequency domain red light signal and the frequency domain infrared light signal with the filtering parameter and generating a filtered red light signal and a filtered infrared light signal;
• and
• calculating the biometric characteristic according to at least one of the green light signal, the filtered red light signal and the filtered infrared light signal.