Described herein is a system and method for performing eye tracking. One embodiment provides a system (100) including a camera (106) for capturing images of a vehicle driver's (102) eye and light emitting diodes (LEDs—108 and 110) configured to selectively illuminate the driver's eye during image capture by the camera (106). A processor (118) is configured to process at least a subset of the captured images to determine one or more eye tracking parameters of the subjects eye and to determine one or more illumination characteristics of the images. A controller (120) is configured to send an LED control signal to the LEDs (108 and 110) to control the drive current amplitude and pulse time of the LEDs (108 and 110). The controller (120) selectively adjusts the drive current amplitude and/or pulse time based on the determined illumination characteristics of a previous captured image or images.

An image recording method (100) and an image recording device (1) for recording a sequence of single images of a scene (3) are provided, wherein the scene (3) is illuminated using an illumination unit (4), a light intensity generated by the illumination unit (4) is characterized by an illumination variable (47), a setting of the illumination variable (47) is performed as long as a regulating reserve (19) of an optimum regulating range (39) of the exposure parameter (46) is present, and a setting of the illumination variable (47) is performed or repeated until the illumination variable (47) is within an optimum regulating range (30) of the illumination variable (47).

An image pickup apparatus that is capable of reducing influence of abnormal reflection light at pre-emission upon determination of an emission amount for main photographing. The image pickup apparatus calculates reflection luminances of reflected light from an object at pre-emission of a lighting device, detects a face area from an image, divides the face area into blocks, calculates a face reflection luminance from a weighted average of reflection luminances of the blocks and first weights of the blocks, calculates a face ambient light luminance from a weighted average of ambient light luminances of the object of the blocks and second weights of the blocks, and determines an emission amount of the lighting device for main photographing with using the face reflection luminance and the ambient light luminance. A first weight of an abnormal luminance block is reduced than that of a block other than the abnormal luminance block.

An image pickup apparatus that is capable of reducing influence of abnormal reflection light at pre-emission upon determination of an emission amount for main photographing. The image pickup apparatus calculates reflection luminances of reflected light from an object at pre-emission of a lighting device, detects a face area from an image, divides the face area into blocks, calculates a face reflection luminance from a weighted average of reflection luminances of the blocks and first weights of the blocks, calculates a face ambient light luminance from a weighted average of ambient light luminances of the object of the blocks and second weights of the blocks, and determines an emission amount of the lighting device for main photographing with using the face reflection luminance and the ambient light luminance. A first weight of an abnormal luminance block is reduced than that of a block other than the abnormal luminance block.

An image capture method for flash photography includes: capturing at least one first image while a strobe device is operating under a first strobe intensity setting for emitting main flash, capturing at least one second image while the strobe device is operating under a second strobe intensity setting different from the first strobe intensity setting, and generating an output image by blending the at least one first image and the at least one second image.

An image capture method for flash photography includes: capturing at least one first image while a strobe device is operating under a first strobe intensity setting for emitting main flash, capturing at least one second image while the strobe device is operating under a second strobe intensity setting different from the first strobe intensity setting, and generating an output image by blending the at least one first image and the at least one second image.

Welding cameras, welding helmets, welding masks, and associated display systems are described herein that utilize darkening or attenuating filters in conjunction with long-exposure imaging to capture flicker-free video of a welding process. Example embodiments include one or more of a darkening filter, an image sensor to capture long-exposure images as frames of a video, an optical image stabilization subsystem, a data storage to store video, and an electronic display to display the video. For example, captured images may be displayed on an electronic display within the welding mask without risk of overexposure of ultraviolet radiation to the operator. In some examples, dual electronic displays are used to display different images to each eye of the operator to provide a stereoscopic video feed.

With a pre-light emission quantity adjusted to an appropriate value, the accuracy of light control for main light emission can be enhanced. A first pre-light emission quantity is obtained with no use of distance information. An appropriate light emission quantity is obtained with use of distance information, and a second pre-light emission quantity is obtained by decreasing the appropriate light emission quantity by a predetermined quantity according to a photometric wave detection capacity. A final pre-light emission quantity is obtained by mixing the first pre-light emission quantity and the second pre-light emission quantity, at a ratio corresponding to the accuracy of the distance information used to obtain the appropriate light emission quantity.

With a pre-light emission quantity adjusted to an appropriate value, the accuracy of light control for main light emission can be enhanced. A first pre-light emission quantity is obtained with no use of distance information. An appropriate light emission quantity is obtained with use of distance information, and a second pre-light emission quantity is obtained by decreasing the appropriate light emission quantity by a predetermined quantity according to a photometric wave detection capacity. A final pre-light emission quantity is obtained by mixing the first pre-light emission quantity and the second pre-light emission quantity, at a ratio corresponding to the accuracy of the distance information used to obtain the appropriate light emission quantity.

An imaging device includes an image sensor, a fill light lamp, and a controller configured to obtain an automatic exposure parameter of the image sensor, and control an illumination intensity of the fill light lamp based on the automatic exposure parameter by adjusting the illumination intensity to a preset value when the automatic exposure parameter falls within an automatic exposure parameter range.