Automatic focusing method and image capturing system

Abstract

The invention relates to an automatic focusing method and an image capturing system. The automatic focusing method comprises the following steps of: focusing in a first movement interval of a focusing mode by using a focusing lens, and recording a plurality of first focusing positions and a plurality of corresponding first focusing data; then judging whether an absolute maximum value exists in the first focusing data; if not, determining a second movement interval, and enabling the focusing lens to focus in the second movement interval to obtain a plurality of second focusing data; and determining the absolute maximum value according to the second focusing data, and enabling a second focusing position corresponding to the absolute maximum value to be an automatic focusing position.

Description

technical field [0001] The invention relates to an imaging technology, in particular to an automatic focusing method of an image capture system. Background technique [0002] Before the digital camera leaves the factory, it usually calibrates the infinity focus position of the focus lens, and records the corrected infinity focus position in the internal memory of the digital camera. When the user half-presses the shutter button to start the auto-focus procedure, the digital camera uses the stored infinity focus position as a reference to move the focus lens to focus. [0003] However, digital cameras are often affected by external environmental changes, such as temperature or humidity changes, or by external forces, such as falling or different placements, causing the focus lens to shift, making the real infinity focus position different from the calibration value before leaving the factory , causing the focus lens to fail to move to the correct focus position, allowing use...

AI Technical Summary

Problems solved by technology

[0003] However, digital cameras are often affected by external environmental changes, such as temperature or humidity changes, or by external forces, such as falling or different placements, causing the focus lens to shift, making the real infinity focus position different from the calibration value before leaving the factory , causing the focus lens to fail to move to the correct focus position, allowing users to shoot blurry images due to poor focus or failure

Especially for lenses made of plastic, since the plastic material itself is easy to absorb moisture, it is easy to cause changes in the refractive index of the lens

In addition, the lens may expa...

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