Real-time automatic focusing method

Abstract

A method for real-time auto-focusing, comprising the steps of: (a) using an automatic exposure unit and an automatic white balance unit of a real-time auto-focusing system to determine whether the focusing environment has changed; (b) if the focusing environment has not changed, then Continue framing and go back to step (a); if yes, use the image obtained by the sensor of the real-time autofocus system to calculate a contrast value; (c) repeat steps (a) and (b) to calculate Another contrast value, comparing one contrast value with another contrast value to determine whether the other contrast value is greater than the one contrast value; (d) if so, move a lens in a certain direction; or, If not, move the lens to another direction; and (e) repeat the cycle of steps (b) to (d) until the number of cycles reaches a predetermined total number of cycles.

Description

technical field [0001] The present invention relates to a real-time auto focus method, in particular to a method that can use information obtained in real time while the user uses LCD to find a view, and after calculation, to control the movement of the lens, and Find the sharpest position on the sensor where the image can be presented. Background technique [0002] Nowadays, there are many ways for people to commemorate the good times, and among them, photos are the most frequently used, because no matter it is a trip, a party, or even any memorable moment, it can be recorded by the camera for the user in the future memories. Furthermore, based on the convenience of using a digital camera to transmit the captured image data to an electronic device (such as a computer) for modification and processing, and its price is gradually falling, so the use of digital cameras Those are increasing day by day. [0003] Furthermore, the auto focus system (auto focus system) has been w...

AI Technical Summary

Problems solved by technology

[0005] 1. Regardless of whether the imaging environment changes, it is usually set to automatically focus every 3 seconds, thus causing unnecessary power consumption;

[0006] 2. Every time when autofocusing, the lens needs to go through the set number of focusing steps (steps) before finding the best focusing point, so the focusing speed is slow, and the real "real-time focusing" cannot be achieved; as well as

[0007] 3. The accuracy of the existing autofocus depends on the number of focus steps set by the lens, and in consideration of the speed, it is usually impossible to set more focus steps, so fine-tuning of the lens cannot be performed, which will affect the to the precision of the autofocus

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