Combined white balance switching device of video camera

Details Combined white balance switching device of video camera Combined white balance switching device of video camera

1990-12-17

1992-07-28

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 41, H04N 973, H04N 907

Patent

active

051344661

ABSTRACT:
The present invention relates to a combined white balance switching device for video camera, and more particularly to a combined white balance switching device that improves over-all color reproduction capability by mainly employing sensor type and in case where color temperature becomes different, switching to image signal sensing type. A sensor-type white balance device adjusts white balance by detecting B(blue) and R(red) components from incident light coming through a white cap 15, comparing said B(blue) and R(red) with reference voltages and outputting control voltages b,a from controllers 22, 23 to control Gain-Controller's 10,9 of color signal shaping circuit 100, and when difference of color temperature values becomes great, an image-signal-sensing-type white balance device adjusts the white balance by detecting R-Y(red-luminance), B-Y(blue-luminance) components from R-Y(red-luminance), B-Y(blue-luminance) matrices 12, 13, comparing said R-Y, B-Y components with reference voltages V1, V2, outputting control voltages c,d as much as the differences between said R-Y, B-Y components and said reference voltages V1, V2 and thus controlling Gain-Controller's 9, 10.

REFERENCES:
patent: 4739392 (1988-04-01), Ueda et al.
patent: 4739393 (1988-04-01), Seki et al.
patent: 4811086 (1989-03-01), Hieda
patent: 4931856 (1990-06-01), Hieda et al.

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