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2236 results about "Exposure" patented technology

In photography, exposure is the amount of light per unit area (the image plane illuminance times the exposure time) reaching a photographic film or electronic image sensor, as determined by shutter speed, lens aperture and scene luminance. Exposure is measured in lux seconds, and can be computed from exposure value (EV) and scene luminance in a specified region.

Electronic image sensor

An electronic imaging sensor. The sensor includes an array of photo-sensing pixel elements for producing image frames. Each pixel element defines a photo-sensing region and includes a charge collecting element for collecting electrical charges produced in the photo-sensing region, and a charge storage element for the storage of the collected charges. The sensor also includes charge sensing elements for sensing the collected charges, and charge-to-signal conversion elements. The sensor also includes timing elements for controlling the pixel circuits to produce image frames at a predetermined normal frame rate based on a master clock signal (such as 12 MHz or 10 MHz). This predetermined normal frame rate which may be a video rate (such as about 30 frames per second or 25 frames per second) establishes a normal maximum per frame exposure time. The sensor includes circuits (based on prior art techniques) for adjusting the per frame exposure time (normally based on ambient light levels) and novel frame rate adjusting features for reducing the frame rate below the predetermined normal frame rate, without changing the master clock signal, to permit per frame exposure times above the normal maximum exposure time. This permits good exposures even in very low light levels. (There is an obvious compromise of lowering of the frame rate in conditions of very low light levels, but in most cases this is preferable to inadequate exposure.) These adjustments can be automatic or manual.

Automatic exposure control method for digital photographic device

The invention discloses an automatic exposure control method for a digital photographic device. According to the automatic exposure control method, a partitioning counted brightness weight model corresponding to a photographing application scenario of the digital photographic device, the target brightness of a target frame image of the photographing application scenario and an exposure curved line corresponding to the photographing application scenario are selected, and the brightness of a current image is calculated in a partitioned mode; then, the average brightness of whole images is calculated, an environment photometry compensation coefficient is determined according to the average brightness, a difference value Delta Bv between the brightness of an image of a current frame and the target brightness serves as an adjustment condition, and the exposure time and an aperture value of a next frame are determined. According to the automatic exposure control method, image brightness estimation is carried out in the manner of adjusting different weight coefficients in a self-adaptation mode according to different scenarios and different collection targets, and photographing scenarios in actual application can be represented better; under the condition of not increasing the software cost and the hardware cost, accurate control over automatic exposure is achieved through simple calculation, and the photographing quality can be effectively improved.
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