Patent ID: 6563537
Filing Date: 2003-05-13
Classification: H04N

Abstract:
An image signal processing apparatus comprising:first edge judgement means for judging from at least four pixels adjacent to an object pixel whether the object pixel constitutes a single edge; first edge direction judging means for judging whether the single edge is horizontal or vertical, if said first edge judging means judges that the object pixel constitutes the single edge; interpolating means for interpolating the object pixel in accordance with at least right and left two pixels adjacent to the object pixel in a horizontal direction, if said first edge direction judging means judges that the single edge is horizontal, and for interpolating the object pixel in accordance with at least upper and lower two pixels adjacent to the object pixel in a vertical direction, if said first edge direction judging means judges that the single edge is vertical; second edge judgement means for judging from the at least four pixels adjacent to the object pixel whether the object pixel constitutes two edges, if said first edge judgement means judges that the object pixel does not constitute the single edge; and second edge direction judging means for judging whether the two edges are horizontal or vertical, if said second edge judging means judges that the object pixel constitutes the two edges, wherein said interpolating means interpolates the object pixel in accordance with at least right and left two pixels adjacent to the object pixel in the horizontal direction, if said second edge direction judging means judges that the two edges are horizontal, and interpolates the object pixel in accordance with at least upper and lower two pixels adjacent to the object pixel in the vertical direction, if said second edge direction judging means judges that the two edges are vertical.