Automatic focusing imaging module

Abstract

An automatic focusing imaging module comprises an imaging lens, an image sensor aligned to the optical axis of the imaging lens, a color separating processor, a controller and a shape memory alloy driver. Light passes through the imaging lens to be imaged on the image sensor. The color separating processor expresses an image sensed by the image sensor through three-primary colors respectively. The controller carries out MTF calculation on the image sensed by the image sensor, and current shooting object distance is determined according to a calculating result. When the current shooting object distance is larger than a preset standard value, the controller conducts defocusing fuzzy modification on the image sensed by the image sensor. When the shooting object distance is smaller than the preset standard value, the controller controls the shape memory alloy driver to drive the imaging lens to focus. The automatic focusing imaging module can obtain an image which is clearly focused no matter whether the object distance is larger than the preset standard value or not.

Description

technical field [0001] The invention relates to an imaging module, in particular to an autofocus imaging module. Background technique [0002] Digital auto-focus technology uses software simulation and calculation to process the image sensed by the image sensor, making the image blurred due to out-of-focus pixels on the image sensor become clear. Extended depth of field (ExtendedDepthofField: EDoF) technology is a common digital autofocus technology, which uses the three primary colors of light (red, green, blue) to have the best modulus transfer function (modulation transfer function, MTF) curve at different distances , so the best primary color at the current distance of the object can be used to digitally simulate the other two primary colors using an algorithm to achieve a full-frame, full-color, clear image. However, the defect of digital focusing is that for close distances, the imaging capability is insufficient due to the large similarity of the MTF curves. Generall...

AI Technical Summary

Problems solved by technology

However, the defect of digital focusing is that for close distances, the imaging capability is insufficient due to the large similarity of the MTF curves. Generally speaking, if the object distance is within the preset standard value range (the preset standard value is usually 40cm), then The focusing effect of digital autofocus technology is often unsatisfactory

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