| 摘要 |
<p>A digital picture signal processing apparatus comprises memory devices (M0 to M15) each capable of storing digital words representing respective pixels which, when arranged in a two-dimensional (2-D) array, make up a picture. A read address generator (16) produces a digital read address identifying, in terms of positions along two orthogonal picture coordinate directions (X, Y), the position of a set of the stored words to be read from respective different ones of the memory devices (M0 to M15), the words of the set representing a set of pixels so positioned relative to one another as to constitute at least some of the pixels of a 2-D portion of the picture The read address comprises at least one least significant bit (X LSBs, Y LSBs) for each of the coordinate directions, the values of the LSBs indicating which one of a plurality of possible relationships between the words of the set and the respective memory devices in which they are stored holds true. A digital filter has a number of multipliers (20) equal to the number of words in the set, each multiplier being connected to a data bus (D) of a respective memory device (M0 to M15) so as to receive a respective one of the set of words read therefrom, and a plurality of coefficient memories (30). Each coefficient memory (30): is connected to a respective one of the multipliers (22); stores all of a plurality of weighting coefficients (C0 to C15) each appropriate to the position of a respective one of the set of pixels in the 2-D portion of the picture; and is responsive to the values of the LSBs and to identification of the memory device whose data bus (D) is connected to the associated multiplier (22) to supply to that multiplier that one of the coefficients stored therein that is appropriate to the position in the 2-D portion of the picture of the pixel represented by the word supplied to that multiplier.</p> |
