Automatic exposure measuring method

Abstract

This invention provides one automatic exposure measurement method to determine exposure value with host image, which comprises the following steps: host testing step to test image host position by use of focus value; exposure value computing step to compute image exposure value by use of automatic exposure computation function.

Description

technical field [0001] The invention relates to an automatic exposure measurement method for a digital camera. Background technique [0002] Automatic exposure (Automatic exposure (AE)), automatic white balance (automatic white balance (AWB)) and automatic focus (automatic focus (AF)), called 3A, are three in the digital still camera (DSC) system important technology. AE is mainly used to control the amount of light reaching the sensor and prevent overexposure or underexposure. [0003] The purpose of AE is to achieve a good exposure balance in the image, including two parts of measurement algorithm and exposure control. [0004] First, a measurement algorithm evaluates the amount of light hitting the sensor and calculates the appropriate exposure value (EV). Then, in terms of hardware control, the exposure control mechanism will control three related devices based on the obtained exposure value, i.e. aperture diameter, shutter speed and sensor sensitivity. [0005] When...

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Problems solved by technology

[0027] However, it is known that the matching degree of OES (that is, choosing the correct pattern) is still not good enough

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