Light metering mode selection method and image acquisition device utilizing same

Abstract

The invention provides a light metering mode selection method and an image acquisition device utilizing same. The light metering mode selection method comprises the following steps of acquiring a first exposure compensation value, a first white balance compensation value and a first focusing distance, wherein the first exposure compensation value, the first white balance compensation value and the first focusing distance correspond with a first image; determining whether a first light temperature which corresponds with the first white balance value is higher than a preset color temperature; if yes, determining a fact that an ambient brightness which corresponds with the first exposure compensation value is higher than a preset brightness; if yes, setting the light metering mode to an average light metering mode; and otherwise, setting the light metering mode to a central weight average light metering mode; if the first light temperature is not higher than the preset color temperature, determining whether the first focusing distance is larger than a preset focusing distance; if yes, setting the light metering mode to the central weight average light metering mode; and otherwise, setting the light metering mode to a point light metering mode.

Description

technical field [0001] The present invention relates to an image processing technology, and in particular to a method for selecting a light metering mode and an image acquisition device thereof. Background technique [0002] The automatic exposure mechanism (AutoExposure, referred to as AE) has always been a very important part of the development of digital cameras. How to find out a set of most suitable exposure compensation values ​​(Exposure Value, EV for short) for different scenes, no matter outdoors or indoors, is the primary task of digital cameras when restoring captured images. [0003] Traditionally, digital cameras can be roughly divided into three different metering methods (MeteringMethod), which are average metering (Average), center-weighted average metering (Center-Weighted Average) and spot metering (Spot). The basic light metering algorithm will cut a complete image into N blocks, after calculating the brightness value of each independent block, multiply t...

AI Technical Summary

Problems solved by technology

However, if spot metering is used, since spot metering only takes into account the brightness of the center of the frame, as long as the objects in the center area are not bright enough, the exposure compensation will be strengthened a lot, and the brighter sky area will be overexposed

In addition, most of the digital cameras or mobile phones are mostly open on the interface for users to choose the appropriate light metering mode, or directly fix a light metering mode, but in such a use situation, it is easy to let the user choose the appropriate light metering mode. Users take images that are overexposed or not bright enough

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