The present invention refers to a smart guide device for visually impaired person, wherein the device includes a laser source (101), an ultrasonic sensor (104) provided near the laser source (101), an output mechanism (108) for providing alert to the visually impaired person about any obstacle (109), a gyroscope (102) attached to the laser source (101), a camera (103) for capturing an image (207) of a refracted laser beam (206) from the obstacle (109), an image processing unit (105) for processing the image captured by the camera (103), an embedded system (106) configured to calculate a height of the obstacle (109) based on the image (207) of the refracted laser beam, the height (205) of the laser source (101) and the angle (201) between a laser beam path (204) and the ultrasonic sensor (104).
