| 摘要 |
Errors in interpolation when using diagonal interpolation can be reduced, thereby high-quality intra-field interpolation can be achieved. A further upper data line ( 41 ) and an upper data line ( 42 ) are inputted into an upper diagonal correlation detection portion ( 21 ), and the upper data line ( 42 ) and a lower data line ( 43 ) are inputted into a lower diagonal correlation detection portion ( 22 ). The lower diagonal correlation detection portion ( 22 ) determines correlation of pixels on actual data lines above and below an interpolation point in a left diagonal direction, a central direction and a right diagonal direction around the interpolation point. The upper diagonal correlation detection portion ( 21 ) determines correlation of pixels on actual data lines above and below an auxiliary interpolation point, which is secondarily set, in a left diagonal direction, a central direction and a right diagonal direction around, for example, the auxiliary interpolation point. On the basis of the determination results, a direction having a strong correlation is detected to produce interpolation data by using pixels in the interpolation direction.
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