Abstract: A method for detecting an object utilizing a monocular camera obtains an image showing an object and determining a pixel coordinate of the object in the image and determining a spatial position of the object in the image, based on the pixel coordinate of the object in the image and a preset coordinate transformation relationship or a preset depth prediction model. The image showing the object is obtained through the monocular camera, and the pixel coordinates of the object in the image are determined. According to the pixel coordinates of the object in the image and the preset coordinates transformation relationship or the preset depth prediction model, the spatial position of the object in the image is determined, providing efficient and accurate detection. An electronic device and a non-transitory storage recording the method are also disclosed.

Abstract: An ultrasonic ranging device includes an ultrasonic transmitter, an ultrasonic transmitting/receiving circuit, and a controller. The ultrasonic transmitter includes transmitting channels arranged in a ring. Each of the transmitting channels transmits a first ultrasonic wave. The first ultrasonic wave is reflected by a target object, the reflection of the first ultrasonic wave is defined as a second ultrasonic wave. Each of the transmitting channels receives the second ultrasonic wave. The ultrasonic transmitting/receiving channel controls the ultrasonic transmitter to transmit the first ultrasonic wave or receive the second ultrasonic wave by switching between working modes. The controller obtains a distance to the target object according to a transmitting time of the first ultrasonic wave and a receiving time of the second ultrasonic wave.

Abstract: A tracking method executed by an optical disc device. The optical disc device includes an optical head for emitting light to read or write data from or to an optical disc. The tracking method includes steps of: providing a table for listing a plurality of predetermined track classes, and a plurality of tracking errors; calculating the number of tracks between a current track in which the optical head is currently positioned and a target track from or to which the optical head reads or writes data; determining whether the number of tracks reaches a predetermined number; searching the table for the corresponding tracking errors when the number of tracking error reaches a predetermined number; calculating second jumping tracks based on the first jumping tracks and the found tracking errors; and driving the optical head to move to the second jumping tracks for tracking.