Automatic focusing compensating device and method for image taking equipment by anti-red eye

Abstract

An automatic focusing compensator and method. An automatic focusing assembly evaluates approximate distance between the camera and object at first and then actuates focus regulator to have a rough operation. Next, the focusing assembly evaluates the distance again according to the first value while an auxiliary device flashes, so that focusing operation achieves.

Description

[0001] Technical solutions [0002] The present invention relates to an image capture device, in particular to an automatic focus compensation device and method using red-eye reduction as the image capture device. Background technique [0003] The auto-focusing methods of the existing traditional camera or digital camera image capturing equipment can be roughly divided into active and passive. Among them, the active auto-focusing method is mostly used by point-and-shoot cameras, which is a continuation of the traditional camera, plus one An independent auto-focusing device, such as a rangefinder composed of an infrared transmitter and an infrared receiver, can detect the brightness of the reflected light from the subject to calculate the distance between the camera and the subject; and the passive type Autofocus is widely used in low- and middle-end digital cameras. It uses the image sensor of the digital camera itself to analyze the focal length evaluation value of the subject, et...

AI Technical Summary

Problems solved by technology

[0004] However, an image capture device using active auto-focus requires an additional independent auto-focus device, and the resolution of its auto-focus varies greatly due to the complexity of the rangefinder, and the addition of a rangefinder will lead to an increase in cost. Increase the inconvenience of mass production; and the passive autofocus image capture device only needs to use its own image sensor to directly calculate the focal length evaluation value inside the camera, which greatly reduces the cost and mass production. problem; but because it has to rely on the judged focal length evaluation value, when the subject is in a dark state or the subject is too simple, its performance is very unsatisfactory, please refer to figure 1 , which shows the change of the focal length evaluation value to the focus position of the lens in the dark state and the bright state. From the curve in the figure, it can be seen that in the dark state (that is, when the light is insufficient) and the bright state (that is, when the light is appropriate), compared with In the bright state, it has a clear focus point, and it is easy to find the correct focus position, but in the dark state, there is no obvious focus point, and it is difficult to obtain the best focus position

Images