Apparatus and method for detecting bio-signal feature

A method of detecting a bio-signal feature, the method comprising:

• acquiring a bio-signal;
• setting a start point and an end point of an effective range of the bio-signal to a minimum point of the bio-signal, and a last zero crossing point or a last valley point of the bio-signal, respectively;
• obtaining an upper envelope signal by linearly connecting the start point, one or more peak points between the start point and the end point, and the end point of the effective range;
• obtaining a lower envelope signal by linearly connecting the start point, one or more valley points between the start point and the end point, and the end point of the effective range;
• detecting a first feature and a second feature of the bio-signal from a first area formed between the upper envelope signal and the bio-signal and a second area formed between the lower envelope signal and the bio-signal, respectively, based on priori information including at least one feature position;
• estimating a blood pressure based on the first feature and the second feature of the bio-signal;
• updating the priori information based on the first feature or the second feature;
• and
• providing the estimated blood pressure through a display.