White balancing device and method for automatic flash lamp of digital camera

Abstract

The present invention is white balancing device and method for automatic flash lamp of digital camera. The digital camera has an image sensor to sense the outside image and a flash lamp module, and the flash lamp module flashes when the first voltage signal representing the sensed brightness is not greater than the first reference voltage signal. The present invention sets one exposure time basedon the image brightness sensed by the image sensor, senses the brightness with the flash lamp module based on the exposure time to set one second voltage signal, and sets and regulates the white balance according to the ratio between the reference voltage signal and the second voltage signal.

Description

technical field [0001] The invention belongs to a camera white balance device, in particular to an automatic flash light white balance device of a digital camera and a method thereof. Background technique [0002] The color of an object is mainly determined by two factors: the selective reflection spectrum of the object, and the light source spectrum in the environment where the object is located. So under different light sources, the same object will have different colors. Therefore, the automatic white balance function provided by the digital camera is to solve the problem that the captured image can still present a consistent color in the environment of light sources with different color temperatures. [0003] In order to automatically detect or estimate the light source in the environment, various solutions have been proposed. The simplest method is to completely follow the built-in flashlight on the body. The spectrum shall prevail, and the preset value stored in the ...

AI Technical Summary

Problems solved by technology

Although this method can obtain a better white balance effect, the process is complicated, requiring a total of two flashes and three shots, and it is necessary to convert the R / G / B of the entire image into a Y signal for brightness comparison

In addition, this method must be based on the following premise: (1) The time interval between the three shooting actions must be extremely short, so that the influence of light sources other than the flash can be regarded as unchanged; In this way, it only makes sense to compare the results of the first flash with the results of no flash

However, due to the huge power consumption of the flash, it will take a considerable amount of time to replenish the main capacitor of the flash device to make up the main capacitor of the flash device in order to make the amount of light emitted by the front and rear flashes the same for the second time, and the first item will be destroyed. assumption; if the time interval is to be shortened, the second assumption will be violated, because the main capacitance may not be replenished

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