11 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 application relates to the technical field of switching power supplies, in particular to a high-power-factor single-stage switching power supply without frequency flicker; an output module is electrically connected with a control module through a dynamic voltage detection module; the control module receives a dynamic voltage signal from the output module; the control module is electrically connected with an input module through a dynamic voltage adjustment module and a primary side feedback module in sequence; the control module generates an adjustment signal according to the dynamic voltage signal, controls the opening or closing of the dynamic voltage adjustment module, feeds back to the input module through the primary side feedback module, and adjusts the dynamic voltage signal generated by the output module by the input module; the control module is electrically connected with the output module through a current chopping adjustment module; the control module generates a chopping signal according to the received dynamic voltage signal, and the chopping signal drives the current chopping adjustment module to chop the dynamic voltage signal generated by the output module; the problem that the output current ripple of the high-power-factor single-stage switching power supply is large is solved.

The invention relates to a stroboscopic therapy device (STG) having at least one light source for generating a strobe effect, a processor and a memory, wherein the stroboscopic therapy device (STG) is configured to receive at least one random audio signal from an audio source (AQ), to generate at least one calculation signal from the audio signal, and to define and output at least one light pulse sequence depending on the at least one calculation signal.

A stroboscopic device to use a camera and a light source with software that generates synthetic and real video frames, compares the frames via a discriminator, repeat until a convergenc point is achieved where the discriminator can't reliably tell the real video frames from the synthetic video frames, analyzes a dense optical flow field between a first and second frame in a sequence of video frames to detect a motion, and controls a light activation to achieve a stroboscopic effect, wherein once achieved, a system identifies an object and automatically detects movement or vibration of the idenfied object using a trained model, enabling precise visualization and analysis of fast motions in video sequences.

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.

The invention relates to the related technical field of computer vision, in particular to a low-light image enhancement method based on image-event two-way guidance, which comprises the following specific steps: step 1, acquiring a low-light image and a paired event tensor as input, step 2, carrying out feature enhancement processing on the event tensor to suppress a stroboscopic effect and global low-frequency noise, and carrying out image-event two-way guidance on the low-light image and the event tensor. The method comprises the following steps of: 1, acquiring a low-light image, 2, enhancing the event tensor, 3, carrying out bidirectional cross attention fusion on the low-light image and the enhanced event tensor to suppress local noise and structural breakpoints, and 4, realizing image reconstruction through up-sampling and a decoder, and outputting the enhanced low-light image. According to the low-light image enhancement method based on image-event bidirectional guidance, through bidirectional cross attention fusion and frequency domain filtering technologies, the problems of noise and color cast of an existing method under an extremely low light condition are effectively solved, the image quality is remarkably improved, and a high-quality data set is constructed to verify the superior performance of the method.

The invention relates to a stroboscopic therapy device (STG) with at least one light source for generating a stroboscopic effect, a processor and a memory, wherein the stroboscopic therapy device (STG) is configured to receive at least one arbitrary audio signal from an audio source (AQ), to calculate at least one computational signal from the audio signal, and to define and output at least one light pulse sequence depending on the at least one computational signal.

The invention discloses an LED lamp drive circuit control method and system for preventing a stroboscopic effect, and the method comprises the following steps: 1, collecting data detected by a sensor, and generating a feature data set; 2, constructing a feature vector; step 3, training an iterative improved LightGBM model, inputting the feature vector into the trained improved LightGBM model, and outputting a multi-dimensional result at a leaf node; 4, executing a multi-target sorting rule according to a multi-dimensional result, and determining a control gear; 5, the driving parameter set of the control gear is issued to an LED lamp driving circuit, and operation of the driving circuit is controlled; and 6, calculating a stroboscopic evaluation index in the rolling time window, and switching a new control gear when the stroboscopic evaluation index exceeds a threshold value. The method can effectively reduce the stroboscopic effect, and is suitable for indoor and outdoor LED illumination system control scenes with high illumination quality requirements.

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.