| 摘要 |
<p>An image signal processing apparatus for converting an interlaced image signal to a progressive scanned image signal is provided. Image signals of three fields are acquired for each pixel by delaying each interlaced input image signal using two field memories connected in series. An intermediate signal is selected from the three signals, and intra-field interpolation or inter-field interpolation is performed using one of the signals depending on the selection result. Meanwhile, the difference between the image signals of the preceding and following fields is calculated. If the difference is not smaller than a reference value, the intra-field interpolation is automatically performed without selecting from the two interpolation methods. Such interpolated pixel values and the pixel values of the present field are alternately read at double speed. As a result, the progressive scanned image signal is obtained.</p> |
