144 results about "Blink frequency" patented technology

A system and method for landmark navigation employing optical beacons deployed at locations throughout a field of operation of a vehicle. The optical beacons emit or reflect an optical signal at a predetermined blink frequency. The locations of the optical beacons may or may not be known to the vehicle. At least one imaging device on the vehicle, such as a digital camera, captures images in the field of operation, and in particular a pair of image frames such that the time interval between the image frames of the pair is equal to one-half of the blink period of the optical signal. Data is generated that represents a difference frame between two image frames captured by the imaging device. Pixel locations of optical beacons in the difference frame are identified. The position and orientation of the vehicle is determined from data representing pixel locations of optical beacons in the difference frame.

A LED control circuit and method generate a high frequency clock signal with a fixed duty for a LED driver, to supply a switching current to drive a LED to emit light flashing at a modulated high frequency and with a fixed duty. By controlling the flashing LED light within certain flashing frequency range, the circuit and method allow a LED light source for expelling, confusing or trapping insects but serving only an illuminative or decorative purpose to human eyes, due to the difference between human beings and insects in visual perception of flashing frequencies.

A method and apparatus are provided to indicate battery capacity status. Different blinking frequencies of an LED correspond to different battery states of charge. Furthermore, the present invention provides a smooth visual brightness change of the LED by providing the appropriate LED current according to human eye characteristics.

A method and device allows to instantly determine the critical fusion frequency of a person without changing the routine viewing and lighting conditions. For a personal computer user, a window with running stripes or a blinking dot is projected onto a video monitor over an existing application. Gradual increase of the blinking frequency until the fusion of the test object is used in determining the critical fusion frequency. Provisions are made to adjust individually such parameters as a distance from the monitor, brightness, contrast, color and surrounding lighting which leads to improved vision and increased critical fusion frequency as can be verified by the same method and device once adjustment is complete. In a second embodiment, a series of dots, each blinking with an individual frequency is presented to the person to choose the one appearing non-blinking with the lowest blinking frequency thus defining the critical fusion frequency.

The invention discloses a voice-operated lighting scene effect realization method. The method includes that audio information collected by an MIC microphone is taken as input information for refining and identification, real-time dynamic information of volume and music rhythm of voice data is extracted, then an LED lamp dimming signal, an LED lamp color matching signal and an LED lamp flicker frequency control signal are outputted through a microprocessor in a PWM (pulse-width modulation) waveform, and further stage scene effect control on light brightness, color and flicker frequency is realized. Art lighting scenes shown by an LED light array is more intelligent and more obvious in interactivity, and the light array can show the art effect in a larger area range.

A system and method for landmark navigation employing optical beacons deployed at locations throughout a field of operation of a vehicle. The optical beacons emit or reflect an optical signal at a predetermined blink frequency. The locations of the optical beacons may or may not be known to the vehicle. At least one imaging device on the vehicle, such as a digital camera, captures images in the field of operation, and in particular a pair of image frames such that the time interval between the image frames of the pair is equal to one-half of the blink period of the optical signal. Data is generated that represents a difference frame between two image frames captured by the imaging device. Pixel locations of optical beacons in the difference frame are identified. The position and orientation of the vehicle is determined from data representing pixel locations of optical beacons in the difference frame.

The invention discloses a fatigue driving detection method based on machine vision human eye recognition. The detection method includes the steps: capturing a human face in a captured image, and tracking and positioning human eyes in real time to obtain a human eye image; processing the human eye image; extracting eye characteristics of a human eye area-of-interest; acquiring human eye characteristics in a waking state, fusing the characteristics according to the acquired human eye height characteristics and human eye blinking frequency characteristics, and judging degree of fatigue; giving analarm for the degree of fatigue. The eye characteristics include the human eye height characteristics and the human eye blinking frequency characteristics. By extracting the eye characteristics of auser, PERCLOS in a detection cycle is calculated and then compared with set PERCLOS, different degrees of fatigue are distinguished according to comparison results, and the user is reminded of two different degrees of fatigue including slight fatigue and severe fatigue. The invention further discloses a fatigue driving detection device based on machine vision human eye recognition.

The invention discloses a fatigue driving electroencephalographic monitoring method. The method includes steps: firstly, device connection and parameter initialization, to be more specific, connecting an electroencephalographic signal acquisition device to an electroencephalographic signal monitoring terminal, and setting fatigue step parameters; secondly, electroencephalographic signal acquisition, to be more specific, using the electroencephalographic signal acquisition device for acquiring and preprocessing electroencephalographic signals of a driver and synchronously transmitting the electroencephalographic signals to the electroencephalographic signal monitoring terminal; thirdly, electroencephalographic signal analytical processing, to be more specific, using the electroencephalographic signal monitoring terminal for calling an electrooculogram judgment module to analytically process the electroencephalographic signals acquired and preprocessed by the electroencephalographic signal acquisition device, namely blink frequency judgment threshold determination, electroencephalographic signal analytical processing before fatigue driving judgment and electroencephalographic signal analytical processing after starting of fatigue driving judgment. The fatigue driving electroencephalographic monitoring method has the advantages of simple procedures, reasonable design, convenience in implementation, effectiveness and simplicity, convenience, quickness and timeliness in accurate monitoring of a fatigue driving state of the driver.

An embodiment of the invention discloses a method for reminding of a breathing lamp. The method includes: receiving a priority division instruction of a user, allocating priority to a specified contact person or a specified application, and the priority including at least two levels; configuring breathing lamp flicker frequency corresponding to the priority, and the breathing lamp flicker frequency that priority of different levels correspond to is different; and when an unread message of the contact person or the application exists, controlling the breathing lamp to flicker at the corresponding flicker frequency according to the priority of the contact person or the application. The embodiment of the invention also discloses a terminal for reminding of the breathing lamp. By adoption of the method and the terminal for reminding of the breathing lamp, a reminding effect and use experience of the terminal can be improved.

The invention discloses a fire alarming method based on video detection. Aiming at video images obtained by a monitoring camera in a fixed view field, the fire alarming method includes the steps of steps 1, carrying out binaryzation division on images in an Ostu method to obtain a foreground area, step 2, removing noisy points through morphological filtering, step 3, summarizing various characters like color brightness, geometrical shapes, diffusion property, irregularity and flicker frequency of the foreground area, and step 4, carrying out synthetic judgment on the computed various characters of the foreground area so as to judge whether flame exists in the video images. A large number of interference influences on binaryzation division of images can be reduced in the Ostu method. Meanwhile, aiming at the defect that a commonly-used flame detection method in the prior art is single or insufficient in judgment character, the fire alarming method extracts the various characters of the foreground area obtained in the Ostu method for synthetic judgment, therefore, quick and accurate recognition on whether the flames exists in the video images is achieved, and meanwhile error rates are reduced greatly.

The present invention provides a mainboard error detection method. Said method includes the following steps: setting correspondent LED blinking frequency for different fault information of mainboard, and making the fault information and their correspondent blinking frequency be formed into a fault information list; eliminating state information of mainboard last-time computer self-detection operation; making computer self-detection and storing the state information of mainboard current-time operation; according to the result of computer self-detection defining that the fault is existed in said mainboard or not; if the fault is existed, reading said fault information and fetching LED blinking frequency correspondent to said fault information.

The invention discloses a wearable electronic instrument, a human health monitoring system comprising the wearable electronic instrument and a human health monitoring method. The wearable electronic instrument comprises a first sensor, a second sensor, a third sensor, a first camera unit, a wireless unit and a micro-control unit, wherein the first sensor is used for detecting the data including the heart rate and the blood pressure of a user in real time; the second sensor is used for detecting the respiratory rate of the user in real time; the third sensor is used for detecting the body temperature data of the user in real time; the first camera unit is used for capturing and counting the blinking frequency of the user in each minute by matching with the micro-control unit; the wireless unit is used for carrying out wireless connection with a portable terminal or a PC terminal; the micro-control unit is used for carrying out analysis and processing on the physiological data acquired by the first sensor, the second sensor and the third sensor, and the data calculated by the first camera unit, and transmitting the data to the portable terminal or the PC terminal through the wireless unit. With the wearable electronic instrument, the human health monitoring system, and the human health monitoring method, a wearer can comprehensively monitor and manage the health state of the wearer.

The invention provides a virtual reality (VR) interaction method and device. The method comprises: detecting an eye action of a VR user in real time; judging whether the eye action of the VR user is active blink; and if the eye action of the VR user is active blink, according to blinked eyes or / and blinking frequency, determining a corresponding VR operating instruction and performing the VR operating instruction on an VR image. According to the VR interaction method and device, no surplus controller is needed, the operability of VR interaction is effectively enhanced, and the immersion and the operation comfortableness of the VR interaction are improved.