| 摘要 |
PURPOSE:To evaluate the propriety of a color picture signal by discriminating the propriety depending whether a differentiating vector combined value written in a 3rd picture memory is larger than a specified value or not so as to specify the range of color unevenness. CONSTITUTION:Single color signals R, G, B are outputted from a signal source 1, inputted to a converter 2, in which they are converted into I, Q signals. The I, Q signals are stored in a 1st picture memory 3A and a 2nd picture memory 3B having addresses corresponding to each picture element, the stored data is read out as a block data, differentiated by differentiating devices 4A, 4B and the result is extracted. The outputs differentiated by the differentiating devices 4A, 4B are subjected to vector synthesis at a computing element 5 and the result of computation is written in an address corresponding to each picture element location in a 3rd picture memory 6, the effect of color shading is eliminated and the portion having color unevenness is stored while being emphasized. The synthesized value written in the memory 6 is read to specify the range in the color unevenness. |
