Abstract:
An iris recognition device, a mobile device having the same, and a method of biometric authentication using the same are provided. The iris recognition device includes: a light source unit configured to transmit a light signal to an iris; and a light source receiver configured to receive a reflected light signal of an image of the iris from the iris, and remove an offset of the reflected light signal, corresponding to noise in the iris image, using a plurality of reference signals having different phases.
Abstract:
An image sensor operates in a base mode according to a first sampling rate and a first pixel exposure time and includes a light condition detector that extracts illuminance information from a pixel signal received from pixels in a pixel array, and generates a low-illuminance information signal upon detecting that a value of the illuminance information falls within a first range, a sampling controller that changes the first sampling rate to a second sampling rate in response to the low-illuminance information signal, and an exposure time controller that changes the first pixel exposure time to a second pixel exposure time in response to the low-illuminance information signal.
Abstract:
A method of measuring the distance to an object by radiating a periodic amplitude-modulated optical signal to the object and detecting the phase difference between the radiated optical signal and a reflected optical signal from the object includes: generating a first photo-detection control signal to control the periodic amplitude-modulation of the radiated optical signal; generating a mask signal activated at least during a shuttering duration for resetting the voltage level at a sensing node; and generating a second photo-detection control signal based on Boolean combination of the first photo-detection signal and the mask signal such that the second photo-detection signal is deactivated or masked at least during the shuttering duration.
Abstract:
A time of flight (TOF) camera device and a method of driving the same are provided. The TOF camera device includes a pulse generator configured to generate a pulse signal, and generate a first photo gate signal and a second photo gate signal; a light source configured to irradiate an object with light emitted in synchronization with the pulse signal; and an image sensor configured to receive light reflected from the object in synchronization with the first photo gate signal during a first frame, and receive light reflected from the object in synchronization with the second photo gate signal during a second frame. The pulse generator is further configured to modulate the pulse signal so as to use a frequency of the light as a single frequency.
Abstract:
An image sensor operates in a base mode according to a first sampling rate and a first pixel exposure time and includes a light condition detector that extracts illuminance information from a pixel signal received from pixels in a pixel array, and generates a low-illuminance information signal upon detecting that a value of the illuminance information falls within a first range, a sampling controller that changes the first sampling rate to a second sampling rate in response to the low-illuminance information signal, and an exposure time controller that changes the first pixel exposure time to a second pixel exposure time in response to the low-illuminance information signal.
Abstract:
An image processing device includes a pixel array including multiple unit pixels each configured to generate multiple color signals in response to incident light, and a data processing unit configured to generate output image data by processing the color signals in parallel in a first operating mode, and further configured to generate two image signals for each unit pixel based on the color signals and to generate the output image data by processing the two image signals in parallel in a second operating mode.
Abstract:
A dynamic vision sensor includes a sensing pixel array including a plurality of sensing pixels each detecting a change of light intensity to output an event by a unit of time-stamp and a control unit that controls the sensing pixel array. Here, each of the sensing pixels has an inclined N-polygon shape, where N is an even number greater than or equal to 4. In addition, each of the sensing pixels includes first sides extended in a first direction that stand opposite to each other in a second direction in a staggered form and second sides extended in the second direction that stand opposite to each other in the first direction in a staggered form, where the first direction is perpendicular to the second direction.
Abstract:
A unit pixel of an image sensor includes a photoelectric conversion unit, a mode control unit, a first signal generation unit and a second signal generation unit. The photoelectric conversion unit generates photo-charges in response to incident light and provides the photo-charges to a first node. The mode control unit prevents the photo-charges from being discharged from the first node in a first operation mode, and generates a sensing current by discharging the photo-charges and generates a sensing voltage proportional to the sensing current in a second operation mode. The first signal generation unit generates an analog signal based on an amount of the photo-charges accumulated in the first node in the first operation mode. The second signal generation unit generates an on signal and an off signal based on a change of the sensing voltage in the second operation mode. The unit pixel provides various sensing outputs effectively.
Abstract:
A lens distortion correction device and an application processor having the same include a distortion correction unit configured to correct a distorted image into an undistorted image and an image enhancement unit configured to improve the undistorted image using a high-frequency component of the distorted image.
Abstract:
An apparatus for controlling a pixel output level includes a column signal line connected to an output node of at least one pixel sensor. The apparatus includes a load circuit is connected between the column signal line and a ground terminal. The apparatus also includes a level adjusting circuit configured to adjust a voltage level of a pixel signal output from the at least one pixel sensor to the column signal line based on a correction target value.