| 摘要 |
PURPOSE:To display an enlarged picture more naturally by calculating the difference of data between picture elements adjacent to a part to be enlarged and interpolating the adjacent picture elements like a step function in accordance with the increase of the difference of the data or linearly at the small difference of data. CONSTITUTION:A window position selecting circuit 6 selects the position and range of a window 2a of a frame memory 2 and determines the position and range of a part to be expanded by a keyboard or the like while observing the video screen 5a of a TV image receiver 5. The number of picture elements in the window 2a is set up to an integer to simplify the processing, and at the time of enlargement, the most outside picture elements of the screen in both the horizontal and vertical directions are made to coincide with the most outside picture elements of the window 2a, the data of the picture elements in the window 2a are read out and supplied to a microprocessor 8, the adjacent picture elements are interpolated, and the interpolated data are supplied to a frame memory 9. At the interpolation of the adjacent picture elements, the picture elements are interpolated linearly when the difference DELTA of data between the adjacent picture elements is small, or like a step function when the difference DELTA is large. |
