Abstract: Warning information that facilitates grasping an obstacle located in rear of a vehicle is provided. A driving assistance system including: a first detection section that detects an obstacle from a plurality of captured images of a rear side of a driver of a vehicle; a second detection section that detects the obstacle by analyzing a reflected wave of a measurement wave transmitted to the rear side; and an information output section that determines a direction in which the obstacle is located with respect to the vehicle on the basis of detection results of the first detection section and the second detection section, and that outputs warning information indicating the direction.

Abstract: An object of the present invention is to provide a vehicle safety assistance system enabling perception of a state of passengers. A vehicle safety assistance system according to the present invention assists safety of at least one passenger on board a vehicle, and includes: a monitoring unit capable of monitoring the passenger in the vehicle; a recognition unit recognizing a state of the passenger by monitoring information from the monitoring unit; and a control unit carrying out control of operation of the vehicle or notification to the passenger on basis of recognition information from the recognition unit, in which the monitoring unit includes a monitoring camera.

Abstract: To shorten a time required to predict collision with other vehicles, a collision prediction device includes: a detection unit configured to detect each of a front, a rear, and a side of other vehicles located around a vehicle from a captured image of one frame in which surroundings of the vehicle are imaged; and a determination unit configured to determine a likelihood of collision with the other vehicles based on a detection result of the detection unit. The determination unit determines that the likelihood of collision with the other vehicle of which only the front or only the rear is detected is high in the other vehicles of which one or more of the front, the rear, and the side are detected by the detection unit.

Abstract: Warning information that facilitates grasping an obstacle located in rear of a vehicle is provided. A driving assistance system including: a first detection section that detects an obstacle from a plurality of captured images of a rear side of a driver of a vehicle; a second detection section that detects the obstacle by analyzing a reflected wave of a measurement wave transmitted to the rear side; and an information output section that determines a direction in which the obstacle is located with respect to the vehicle on the basis of detection results of the first detection section and the second detection section, and that outputs warning information indicating the direction.

Abstract: With respect to two images acquired from two video images including a mutually-overlapping area in which the two video images overlap each other, an image transformation matrix for mapping coordinate systems is sequentially generated. Coordinate transformation of at least one image of the images is performed using the generated image transformation matrix. A composite image is created by overlaying two images with the at least one image subjected to the coordinate transformation. The currently used image transformation matrix and the newly generated image transformation matrix are compared with each other. If the two image transformation matrices are similar, the coordinate transformation is performed using the currently used image transformation matrix continuously. If the two image transformation matrices are dissimilar, the coordinate transformation is performed using an image transformation matrix corrected with the newly generated image transformation matrix.

Abstract: The accuracy of detection of a heartbeat is increased and a time for detection of a heartbeat is shortened. A heartbeat detection device includes a heartbeat detection unit which detects a heart rate using the luminance of captured images of a part of a body surface of a user, which are captured images of a plurality of frames which have been captured in chronological order. The heartbeat detection unit computes a total luminance of the captured image of each of the frames, delays a vibrating wave representing chronological change of the total luminance at certain time intervals, and computes the heart rate using a cycle of a peak at which a difference between the vibrating wave which has not been subjected to a delay and each vibrating wave which has been subjected to a delay is reduced in a waveform of the difference.

Abstract: With respect to two images acquired from two video images including a mutually-overlapping area in which the two video images overlap each other, an image transformation matrix for mapping coordinate systems is sequentially generated. Coordinate transformation of at least one image of the images is performed using the generated image transformation matrix. A composite image is created by overlaying two images with the at least one image subjected to the coordinate transformation. The currently used image transformation matrix and the newly generated image transformation matrix are compared with each other. If the two image transformation matrices are similar, the coordinate transformation is performed using the currently used image transformation matrix continuously. If the two image transformation matrices are dissimilar, the coordinate transformation is performed using an image transformation matrix corrected with the newly generated image transformation matrix.

Abstract: In order to provide a highly reliable heart rate, this heartbeat detection device includes: a first detection unit that detects heartbeats from a vibration wave of a body surface of a user detected by a sensor; a second detection unit that extracts a vibration wave of heartbeats which are amplitude-modulated with a resonant frequency of a human body from the vibration wave of the body surface of the user, delays the extracted vibration wave by a predetermined period, and detects heartbeats from differences between the vibration wave before delay and the vibration waves after delay; and an output control unit that selects either the heartbeats detected by the first detection unit or the heartbeats detected by the second detection unit and determines and outputs a heart rate on the basis of the selected heartbeats.

Abstract: To shorten a time required to predict collision with other vehicles, a collision prediction device includes: a detection unit configured to detect each of a front, a rear, and a side of other vehicles located around a vehicle from a captured image of one frame in which surroundings of the vehicle are imaged; and a determination unit configured to determine a likelihood of collision with the other vehicles based on a detection result of the detection unit. The determination unit determines that the likelihood of collision with the other vehicle of which only the front or only the rear is detected is high in the other vehicles of which one or more of the front, the rear, and the side are detected by the detection unit.

Abstract: An input unit inputs detected information that has been acquired by a sensor. By inserting time information into the detected information that has been input, a multiplexer generates an information sequence in which the detected information and the time information are multiplexed in a time-dividing manner. A transmission unit transmits the information sequence. The time information in the multiplexer is used to synchronize timing between detected information included in an information sequence transmitted from another transmitter and the detected information in the multiplexer.

Abstract: An input unit inputs detected information that has been acquired by a sensor. By inserting time information into the detected information that has been input, a multiplexer generates an information sequence in which the detected information and the time information are multiplexed in a time-dividing manner. A transmission unit transmits the information sequence. The time information in the multiplexer is used to synchronize timing between detected information included in an information sequence transmitted from another transmitter and the detected information in the multiplexer.

Abstract: A min-sum processing unit executes a min-sum algorithm on input data so as to alternately execute check node processing in which an extrinsic value ratio is updated based on prior value ratios and variable node processing in which a prior value ratio is updated based on the extrinsic value ratios. Here, an initializing unit calculates the total product of the signs of the prior value ratios associated with the row to be processed. A deriving unit derives the sign for an extrinsic value ratio associated with the row to be processed, based on the sign of the prior value ratio that is unused in the updating of the extrinsic value ratio and the total product of the signs thus calculated. An updating unit updates an extrinsic value ratio associated with the row to be processed, using the sign thus derived.

Abstract: A check node processing unit updates an extrinsic value ratio based on a prior value ratio for each row of a parity check matrix with respect to input data. An identifying unit identifies, based on an element of the parity check matrix that can be identified by a row and column associated with the updated extrinsic value ratio, a next-target element in the same column and in a different row. The identifying unit identifies an element to be updated in the next step by the check node processing unit, from among multiple elements included in the same column. A variable node processing unit updates, based on the extrinsic value ratio, a prior value ratio associated with the identified next-target element after the check node processing unit completes the updating of each row. The check node processing unit and the variable node processing unit alternately and iteratively execute their operations.

Abstract: A linear equalizer unit sequentially subjects a signal to be processed to linear equalization. A temporary decision unit sequentially subjects a signal subjected to linear equalization by the linear equalizer unit to temporary decision. A nonlinear equalizer unit derives a plurality of coefficients using a signal subjected to temporary decision as a teacher signal and sequentially subject a signal subjected to linear equalization by the linear equalizer unit to nonlinear equalization based on the plurality of coefficients.

Abstract: In a tensioner having a ratchet mechanism composed of annular teeth on a plunger and an expansible resilient ring disposed in a groove formed in the inner peripheral surface of a plunger-accommodating hole in a tensioner housing, the rear surfaces of the annular teeth have a steep slope, and the front surfaces of the annular teeth have a gradual slope with a convex curvature such that the rate of change of the slope decreases proceeding in the direction of retraction of the plunger.

Abstract: A frame data storage unit inputs LDPC encoded data via a communication path. An estimation unit estimates, based on the inputted data, a situation of the communication path. A selection unit select, in accordance with the estimated situation of the communication path, one of a plurality of normalization constants that have been specified in advance and are to be used in updating an exterior value ratio based on a priori value ratio in check node processing according to a min-sum algorithm. A min-sum processing unit executes, on the inputted data, the min-sum algorithm by using the selected normalization constant.

Abstract: A data storage unit receives LDPC encoded data. A min-sum processing unit alternately executes, on the inputted data, check node processing for updating an external value ratio based on a priori value ratio and variable node processing for updating the priori value ratio based on the external value ratio, by executing a min-sum algorithm. A control unit adjusts, in accordance with the magnitude of the priori value ratio to be updated in the variable node processing, the magnitude of a normalization constant to be used in updating the external value ratio in the check node processing.

Abstract: A min-sum processing unit executes a min-sum algorithm on input data so as to alternately execute check node processing in which an extrinsic value ratio is updated based on prior value ratios and variable node processing in which a prior value ratio is updated based on the extrinsic value ratios. Here, an initializing unit calculates the total product of the signs of the prior value ratios associated with the row to be processed. A deriving unit derives the sign for an extrinsic value ratio associated with the row to be processed, based on the sign of the prior value ratio that is unused in the updating of the extrinsic value ratio and the total product of the signs thus calculated. An updating unit updates an extrinsic value ratio associated with the row to be processed, using the sign thus derived.

Abstract: A check node processing unit updates an extrinsic value ratio based on a prior value ratio for each row of a parity check matrix with respect to input data. An identifying unit identifies, based on an element of the parity check matrix that can be identified by a row and column associated with the updated extrinsic value ratio, a next-target element in the same column and in a different row. The identifying unit identifies an element to be updated in the next step by the check node processing unit, from among multiple elements included in the same column. A variable node processing unit updates, based on the extrinsic value ratio, a prior value ratio associated with the identified next-target element after the check node processing unit completes the updating of each row. The check node processing unit and the variable node processing unit alternately and iteratively execute their operations.

Abstract: A tensioner for a chain or similar power transmission medium comprises a spring-biased plunger having annular rack teeth with gradually sloping forward surfaces and steeper rearward surfaces. The teeth are engaged by radially movable balls received in inclined grooves in an axially movable annular ball seat disposed in an annular groove formed in the wall of a plunger-accommodating hole in a tensioner housing. The bottoms of the inclined grooves face a steep rearward surface of a rack tooth, and the annular ball seat is axially movable in the annular groove and biased in the plunger protruding direction by a spring that exerts a biasing force greater than the biasing force exerted on the plunger. The balls and the movable annular ball seat block retraction of the plunger on engine start-up, but permit retraction when excessive force is imparted to the plunger while the plunger is in a protruding condition.