Blind source separation technology controlled focusing system based on FASTICA algorithm

Abstract

The invention discloses a blind source separation technology controlled focusing system based on an FASTICA algorithm. The system comprises a blind source separation module, a GCC-PHAT time delay estimation module, a geometric positioning module and a camera module which are connected in sequence, wherein the blind source separation module comprises an amplifying circuit, a synchronous data acquisition circuit and a signal processing module; the GCC-PHAT time delay estimation module comprises a multichannel audio input circuit an a digital signal processor; the geometric positioning module comprises multiple voice channels and a digital signal processor and a control logic CPLD; and the camera module comprises an image information analysis and focusing weight adjustment module and a digital camera module. The system adjusts the distance between the internal parts of the camera lens and the photosensitive component according to the shooting distance measured during shooting, thus the subject can be clearly imaged on the photosensitive component, and the best focusing point can be obtained through adjustment even under low light level and low contrast conditions to achieve focusing. The system combines the blind source separation technology with the camera, thus the camera is simple to operate, accurate to position, intelligent and short in focusing time.

Description

technical field [0001] The invention relates to the field of signal processing and the field of optical-mechanical integration, in particular to blind source separation technology and automatic focusing technology. Background technique [0002] Autofocus technology is developed gradually from the prototype of an autofocus camera exhibited by Canon at the Cologne Fair in 1963. It uses the basic principle of object light reflection to transmit the reflected light to the sensor CCD, and through the intelligent chip processor, it drives the electric focusing device to focus. It can be divided into active and passive. At present, most digital cameras adopt a passive auto-focus method, that is, directly receive and analyze the reflected light of the subject, and use the principle of phase difference to focus. It does not need a launching device, reduces energy consumption, saves space and is conducive to miniaturization. But in low light conditions, low contrast and other condi...

AI Technical Summary

Problems solved by technology

[0003] In order to provide better camera focus, provide convenience for group selfies, and avoid problems such as unclear photos caused by multiple refractions of light caused by failure to focus normally, the present invention provides an algorithm based on FASTICA (Fast Independent Component Analysis) The Blind Source Separation Technology Controls the Focusing System

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