KR940023182A - Camcorder's Auto White Balance Circuit - Google Patents

Abstract

This article relates to the automatic white balance adjustment of a video camera. A commonly used white balance circuit uses IR.IG.IB data, which integrates the entire screen for one field, If IG is calculated and its values are within the preset white area, it is judged whether white balance is performed. In some cases, the white balance is distorted in a combination of colors that are complementary to each other.

In the present invention, in order to solve the defect caused by the white balance circuit of the conventional camcorder as described above, in integrating an entire screen, it is determined whether or not it is an approximate white color for each pixel unit, and the portion considered to be the primary color or the intermediate color is It is an object of the present invention to provide a white balance adjustment circuit of a camcorder for adjusting white balance by removing and integrating only a portion judged to be white and determining whether it is again within the white balance tracking area.

Description

Camcorder's Auto White Balance Circuit

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

4 is an automatic white balance circuit diagram of a camcorder of the present invention, FIG. 5 is an exemplary diagram of a white region for explaining the operation of FIG. 4, and FIG. 6 is a detailed circuit diagram of the white detector 13 in FIG.

Claims (2)

CD 10 for converting light input into the camcorder into electrical energy, a camera signal processor 11 for generating RGB signals required for the electrical signal output from the CD 10, and the camera signal processor 11 A calculation unit 12 for obtaining R / G and B / G using the RGB signal of the < RTI ID = 0.0 >), a white detector 13 for detecting only the data of the R / G, B / G < / RTI > Integrator 14 for integrating the output for one field, switch unit 15 for selecting RGB signals under the control of the microcomputer 18, and integrated signals for each RGB and reference triangle wave signals are compared with each other. PWM conversion of the pulse output of the comparator 17, the triangular wave generator 16 for generating a reference signal to the comparator 17, and the comparator 17 to calculate IR / IG, IB / IG Camcorder chair characterized in that it consists of a microcomputer 18 to perform automatic white balance White balance circuit. The R / G and B / G outputs of the divider 12 have respective comparators 13-1, 13-2, 13-3, and 13-. 4) are respectively input to one input terminal of the comparators 13-1 to 13-4, and y ₁ , y ₂ , x ₁ , x ₂ , which are boundary values of the approximate white region in FIG. The outputs of the comparators are inputted and combined at the AND gates 13-5 and 13-6, respectively, and the reference signal Vref is input to one side thereof, and the R / G and B / G signals are inputted to the other side thereof. The outputs of the auto amplifiers 13-7 and 13-8 and ground signals respectively applied to the switches 13-9 and 13-10 are controlled by the outputs of the AND gates 13-5 and 13-6. Automatic white balance circuit of the camcorder, characterized in that configured to be selected and output through. ※ Note: The disclosure is based on the initial application.