专利名称：HUE DISCRIMINATION CIRCUIT
发明人：KANDA HIROKO，神田 裕子
申请号：JP特願平11-164798
申请日：19990611
公开号：JP特開2000-354252(P2000-354252A)A
公开日：
20001219
hue trunc函数
专利内容由知识产权出版社提供
专利附图：
摘要：PROBLEM TO BE SOLVED: To efficiently perform realization at a low cost by small circuit constitution by directly detecting a specified color by using color difference signals. SOLUTION: The hue of chroma is divided on a plane where the hue is expressed by the color difference signals (R-Y and B-Y) and whether or not it is in a certain specified
hue is discriminated. The respective boundary lines of the discrimination areas (1)-(16) of the hue on the R-Y and B-Y plane are expressed by a formula K=α×(B-Y)+β(R-Y) on condition that it is the integer of the range of α=0-4 and β=-4-4. From the
positive/negative of the value of the expression, which side of the respective boundary lines the hue is on is discriminated. That is, in order to detect whether or not the chroma is in the certain hue, the two coefficient sets of the expression to be the boundary line of the hue are selected and discrimination is made by checking the positive/negative of the two expressions. When detection is performed by this method, since the need of tentatively converting the color difference signals (R-Y and B-Y) to RGB signals and processing them is eliminated, a chroma key is realized by the small circuit constitution.
申请人：SONY CORP,ソニー株式会社
地址：東京都品川区北品川6丁目7番35号
国籍：JP
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