Method and device for regulating exposure

Abstract

The embodiment of the invention discloses a method for regulating exposure, which is characterized by dividing the lightness interval of a system into at least three subintervals in advance, respectively setting a fitting function for each subinterval, and presetting an object lightness value, an upper limit value and a lower limit value thereof. The method comprises the following steps: obtaining parameter values at the current time, wherein the parameter values comprise a lightness statistic value of an input image at the current time; when the lightness statistic value is not within the interval composed of the upper limit value and the lower limit value of the object lightness value, judging the subinterval to which the lightness statistic value belongs; and regulating the exposure through the fitting function corresponding to the subinterval to which the lightness statistic value belongs. The embodiment of the invention further discloses an exposure regulating device. The embodiment of the invention also discloses an exposure regulating device. Different fitting functions are set for different lightness intervals, so new grains and exposure times of different intervals can be calculated according to the different fitting functions in the exposure regulating process, thereby reducing overshoot and enhancing the stability of exposure control of the system.

Description

technical field [0001] The present application relates to the field of imaging technology, and in particular to an exposure adjustment method and device. Background technique [0002] Exposure is the process of forming an image through a photosensitive device such as CMOS (Complementary Metal-Oxide Semiconductor, Complementary Metal Oxide Semiconductor) receiving light from the lens, and the time when the photosensitive device receives light is the exposure time. In the process of shooting, the intensity of light and shade of the background or subject will change, so when the external light becomes stronger, it will be overexposed, resulting in the captured picture being too bright and lacking in layers and details, and it will be exposed when the external light becomes weaker Insufficient, resulting in the pictures taken are too dark to reflect the real color, so the exposure needs to be adjusted and controlled during the shooting process, in which the automatic exposure ad...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiment of the present application is to provide an exposure adjustment method and device to solve the problem in the prior art that the exposure adjustment process is unstable due to a single fitting function

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