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A fast automatic camera exposure time adjustment method and device

A technology that automatically adjusts the device and exposure time. It is used in cameras, exposure control, optics and other directions. It can solve the problems of high image quality requirements, difficult to meet mechanical shutter and aperture, and achieve high computing speed, easy hardware transplantation, and strong real-time performance. Effect

Active Publication Date: 2018-01-26
凯迈(洛阳)测控有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a fast automatic adjustment method of camera exposure time to solve the problem that the existing mechanical shutter and aperture are difficult to meet the requirements of automatic, fast exposure and high image quality

Method used

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  • A fast automatic camera exposure time adjustment method and device
  • A fast automatic camera exposure time adjustment method and device
  • A fast automatic camera exposure time adjustment method and device

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Embodiment Construction

[0025] Due to the particularity of large impact and high-speed applications, some image reconnaissance devices cannot choose the traditional mechanical shutter and aperture to adjust the normal exposure of the camera. In order to make the system adapt to certain changes in the external light intensity, the applied imaging system uses a fixed aperture and an automatic continuously adjustable electronic shutter to realize adaptive exposure control. The entire control logic is designed and implemented on a single FPGA.

[0026] First divide the exposure time of the camera, and the exposure time corresponds to different gears from short to long; initialize a fixed exposure time Tms for the camera, and the exposure time corresponds to a gear, and the corresponding relationship between the gear and the exposure time is preset Ok, and take the first shot, and count the average grayscale of the image.

[0027] Such as figure 1 , the abscissa of the image grayscale histogram represen...

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Abstract

The present invention relates to a fast automatic adjustment method and device for camera exposure time, which divides camera exposure time into different gears, and the exposure time corresponds to different gears from short to long; initializes the exposure time for the camera, and takes pictures to obtain an image , and calculate the average gray value of the image; express the average gray value in eight-digit binary, and compare the upper five digits with the exposure intensity value in the preset exposure intensity-adjustment step table to obtain the The adjustment step value corresponding to the exposure intensity; adjust the current gear according to the adjustment step value to get a new gear, then the exposure time corresponding to the new gear is the camera exposure time for the next shooting, realizing the camera exposure time Automatic adjustment; the invention only relies on high-performance FPGA to collect image data at high speed, and evaluates the camera exposure intensity by using the average gray scale of the image. The algorithm is simple, effective, and real-time, and it is convenient for hardware transplantation.

Description

technical field [0001] The invention belongs to the technical field of camera automatic exposure, and relates to a fast automatic adjustment method for aerial camera exposure time. Background technique [0002] In the process of taking pictures with traditional digital cameras, photometers are generally used as the light metering unit to adjust and control the mechanical aperture and mechanical shutter. Loss of interesting details; in addition, some image detection devices fall fast and have high levels of mechanical shock, which requires the camera's automatic exposure control algorithm to be simple, fast, accurate and effective, occupy less system resources, and have strong hardware Portability, obviously, the mechanical shutter and aperture are difficult to meet the requirements of fast exposure, anti-vibration, anti-shock, etc., and the obtained aerial photos are not good. [0003] In recent years, there have been methods such as using the CCD sensor to output grayscale...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235G03B7/08
Inventor 张帆肖佑平刘洋王春江李萍
Owner 凯迈(洛阳)测控有限公司
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