Electronic view finder having a color vector display

Details Electronic view finder having a color vector display Electronic view finder having a color vector display

1994-07-22

1995-07-04

Razavi, Michael T.

Television

Camera, system and detail

With electronic viewfinder or display monitor

348223, 348259, H04N 530, H04N 5225

Patent

active

054304822

ABSTRACT:
In a video signal camera having a signal processor for generating a luminance signal Y and a chrominance signal components R-Y and B-Y, an electronic view finder having a color vector display for displaying a vector corresponding to white balance on a monochromatic electronic view finder includes an amplifier for amplifying the peak values R-Y.sub.pp and B-Y.sub.pp of the chrominance signal components, a clamping circuit for changing a direct current (DC) value of the chrominance signal components generated by the amplifier, an analog-to-digital converter (ADC) for converting the chrominance signal components output from the clamping circuit and the luminance signal into respective digital data values, an integrator for summing the digital data values provided by the ADC for each of a predetermined number of blocks corresponding to a screen, a controller for extracting a white area representing the integrated value of each block computed by the integrator and obtaining a white vector value for the extracted white area, and a display receiving the white vector value for displaying a respective white vector on the screen. Accordingly, since a white color vector is displayed in the OSD within a monochromatic electronic view finder, a white balance can be detected while employing the monochromatic electronic view finder.

REFERENCES:
patent: 5267026 (1993-11-01), Kawahara et al.
patent: 5295204 (1994-03-01), Parulski

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