Automatic white balance control apparatus capable of performing

Details Automatic white balance control apparatus capable of performing Automatic white balance control apparatus capable of performing

1992-10-05

1993-12-28

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 41, H04N 973, H04N 904, H04N 964

Patent

active

052744400

ABSTRACT:
In an automatic white balance control apparatus which is less sensitive to a monochromic subject, color difference signals R-Y and B-Y are converted into digital values by A/D converters (20, 21). A quadrant determination circuit (22) determines for each digital color difference value to which quadrant of a two-dimensional coordinate system with an ordinate representing (R-Y) and an abscissa representing (B-Y) it belongs. Digital color difference values within one field are accumulated by accumulation device (28, 29, 30) per each quadrant. With respect to the digital color difference values (R-Y) wig& one field, digital difference values of pairs each one sampling period apart from each other are accumulated per each quadrant. The above two kinds of accumulations are carried out also with respect to the digital color difference values (B-Y) within one field. When the accumulated values of the two color difference values (R-Y) and (B-Y) within the respective quadrants are compared to control gains for R-Y and B-Y by a microprocessor (31), the accumulated value of the color differences in the quadrant, of which accumulated value of the digital difference values is small, is given a small weight.

REFERENCES:
patent: 4602277 (1986-07-01), Guichard
patent: 4922330 (1990-05-01), Saito et al.
patent: 5021875 (1991-06-01), Iida et al.
patent: 5099316 (1992-03-01), Ogawa
patent: 5170247 (1992-12-01), Takagi et al.
patent: 5198890 (1993-03-01), Suga

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