3 results about "Stroboscopic effect" patented technology

A stroboscopic device, comprising: a camera for acquiring video frames; a light source; and at least one hardware processor; and software that is configured to, when executed by the at least one hardware processor, acquire a sequence of video frames via the camera, convert the frames from RGB to grayscale, for a first and second frame in the sequence of video frames, compute the dense optical flow field between the two frames, wherein the optical flow field contains a flow vector for each pixel in each of the first and second frames, indicating the motion of that pixel from the first frame to the second frame, calculate the average magnitude (Average Optical Flow or AOF) of all flow vectors for each pixel in the first and second frames, compare the AOF to a threshold, and store a result based on the comparison, repeat the process for all frames in the sequence of video frames, determine whether a stroboscopic effect has been achieved based on the store results, control the activation of the light source until the results indicate that the stroboscopic effect has been achieved, control the activation of the light source until the results indicate that the stroboscopic effect has been achieved, and obtain a further sequence of video frames after the stroboscopic effect is achieved, identify an object in the further sequence of video frames, and automatically detect movement or vibration of the identified object.

The present disclosure relates to a stroboscopic detection method, device and medium. The method comprises: acquiring a sampling signal of an under-screen light sensor arranged on an electronic device; performing frequency domain transformation on the sampling signal to obtain a plurality of frequency domain components corresponding to the sampling signal; determining, according to the frequency domain components, that the sampling signal includes ambient light alternating component information; and determining that the electronic device has a stroboscopic effect if it is determined that the sampling signal includes the ambient light alternating component information. By detecting whether the stroboscopic effect exists, corresponding measures can be taken in time to eliminate it, avoiding the user from seeing alternating bright and dark stripes in the preview image, and improving the user's experience. In addition, the original under-screen light sensor of the electronic device is used, and a dedicated brightness sensor does not need to be configured near the camera of the electronic device, simplifying the production process.

A stroboscopic device, comprising: a camera for acquiring video frames; a light source; at least one hardware processor; and software that is configured to: acquire a sequence of video frames via the camera; convert the frames from RGB to grayscale; for a first and a second frame in the sequence of video frames, compute a dense optical flow field between the two frames; calculate an average magnitude (Average Optical Flow or AOF) of all flow vectors for each pixel in the first and second frames; compare the AOF to a threshold, and store a result based on the comparison; repeat the process for all frames in the sequence of video frames; determine whether a stroboscopic effect has been achieved based on the stored results; control activation of the light source until the results indicate that the stroboscopic effect has been achieved; obtain a further sequence of video frames after the stroboscopic effect is achieved; identify an object in the further sequence of video frames; and automatically detect movement or vibration of the identified object.