KR950025736A - Auto Focusing Device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic focusing apparatus, comprising: a lens unit that receives an image of a subject, a solid-state image pickup device for photoelectric conversion of image information received by the lens unit, and an electrical signal converted by the solid-state image pickup device as a video signal. A video signal processing unit for creating and processing an image, a band pass filter unit for passing only a frequency of a predetermined range of luminance signals from the video signal output from the video signal processing unit, and A for converting the band-passed analog signal into a digital signal. A / D converter, a detection processor for selectively accepting only signals in the detection window by window pulse signals, and a digital signal converted into a digital signal by the analog / digital converter, and a luminance signal output from the video signal processor. A low pass filter, an amplifier, and a position shift pulse generator for generating shift pulses; A microcomputer receiving the position shift pulse generated by the position shift pulse generating unit and an output signal of the detection processing unit and outputting a motor driving control signal and window data, and a window pulse generating unit generating window pulses by receiving the window data from the microcomputer; And a motor drive unit for driving the motor according to the control signal of the microcomputer, thereby detecting the movement of the subject as a change in the luminance signal and moving the position of the detection window according to the detection degree, thereby improving the performance of the autofocus control. It would be.

Description

Auto Focusing Device

Since this is an open matter, no full text was included.

2 is a block diagram of an automatic focus cutting apparatus according to the present invention,

3 is a diagram illustrating a process of generating a position shift pulse by detecting a luminance signal;

4 is a view for explaining an embodiment of the present invention;

Claims (2)

A lens unit 100 which receives an image of a subject; A solid-state imaging device (110) for photoelectric conversion of the image information; An image signal processor (200) for image processing the electrical signal converted by the solid scratch device (110) into an image signal; A band pass filter unit 300 for passing only a frequency within a predetermined range of luminance signals from the image signal output from the image signal processor 200; An analog / digital converter 310 for converting the band-passed analog signal into a digital signal; A window pulse generator 330 which receives window data and generates window pulses; A detection processor (320) for selectively receiving only a signal in a detection window by the window pulse signal generated by the window pulse generator (330), the digital signal converted by the analog / digital converter into a digital signal; A low pass filter 400 for passing only a low frequency of the luminance signal output from the image signal processor; An amplifier 410 for amplifying an output signal of the low pass filter; A position movement pulse generator 420 for generating a position pulse by using the signal amplified by the amplifier and the window pulse generated by the window pulse generator; Receives the position movement pulse generated by the position movement pulse generator and the output signal of the detection processor, detects the movement of the subject, outputs a control signal to the motor driver 600, and sends window data to the window pulse generator 330. Providing 500; Automatic focus control apparatus including a motor driving unit for driving a motor in accordance with the control signal of the microcomputer. The method of claim 1, wherein the window pulse generator comprises a counter (900, 910, 920, 930) for calculating the window data value output from the microcomputer, or gates (940, 950) for logical operation of the output value of the counter; Autofocus control device, characterized in that consisting of the end gate (970). ※ Note: The disclosure is based on the initial application.