Focus curve establishment method and device

Abstract

The invention provides a method and device for establishing a focus curve, and relates to the field of image processing. The method includes: establishing a coordinate system with the zoom parameter as the abscissa and the focus parameter as the ordinate, wherein the object distance in the process of capturing the image to be processed by the lens is a fixed value; using a monotone hill climbing algorithm to determine the preset zoom parameters in the coordinate system The key points, and the focus parameter points corresponding to the preset zoom parameter key points that meet the preset sharpness conditions; according to the focus parameter points that meet the preset sharpness conditions corresponding to the preset zoom parameter key points, a focus curve is generated . Compared with the prior art, it can improve the efficiency of generating the focus curve, provide a focus curve that can actually be followed for the simple motorized lens zoom follow, reduce the focusing time of the simple motorized lens, and weaken the focus jitter and fluctuation of the simple motorized lens.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a method and device for establishing a focus curve. Background technique [0002] With the popularization of surveillance in safe cities, smart cities, and future snow-bright projects, the demand for cameras is increasing, and the demand for optical lenses, known as the "eyes" of cameras, is also increasing, especially in high-definition, In the tide of intelligence, with the improvement of resolution, the demand for high resolution and support for electric zoom lens is particularly strong. [0003] However, the price of an integrated lens with high-quality optical performance and support for precise control is relatively expensive, and the price-performance ratio of cheap motorized lenses makes more products choose to sacrifice zoom follow-up or auto-focus effects. [0004] The simple motorized lens technology and structure are much simpler than the integrated ...

AI Technical Summary

Problems solved by technology

[0003] However, the price of integrated lens with high-quality optical performance and support for precise control is relatively expensive, and the price performance ratio of cheap motorized lens makes more products choose to sacrifice zoom follow or auto focus effect

[0004] The simple motorized lens technology and structure are much simpler than the integrated movement lens, but because of the omission of the Pi point, precision slider and process differences, the control accuracy and return distance are relatively large. Most manufacturers only support full-scale search for this type of lens. The automatic focus, the focus blur is serious after zooming, the focus time is long, the process is repeatedly clear and blurred, and the focus effect experience is extremely poor

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