| 摘要 |
Picture data of frames [-2] to [+2] of an input picture signal is stored to frame memories fm [-2] to fm [+2]. The picture data of the frame f [0] is supplied to an area extracting circuit. In addition, the picture data of each frame is supplied to a pixel extracting circuit. A horizontal direction DR calculating circuit and a vertical DR calculating circuit calculate a DR in the horizontal direction and a DR in the vertical direction, respectively, and determine the maximum values thereof. A voting range determining circuit and a voting range updating circuit perform a process for finally determining a voting range corresponding to the maximum value of the DR in the horizontal direction and the maximum value of the DR in the vertical direction and a process for designating a new area. A pixel extracting circuit extracts pixels on a straight line defined by straight line parameters. A dispersion calculating and straight line parameter holding circuit performs a process for calculating the dispersion of the extracted pixels, comparing the calculated values, and holding the calculated value and straight line parameters corresponding to the calculated value and a process for updating the straight line parameter. A straight line parameter voting circuit selects the maximum frequency of the supplied straight line parameters. A voting pixel updating circuit updates voting pixels. |
