| 摘要 |
<p>PURPOSE: To attain a fast conversion/coding operation by dividing an image into a fixed number of blocks, repeating the operations of a multiplier in the addresses pointed by a pointer, and also securing the cascade connection of steps in a conversion/coding operation. CONSTITUTION: A block generation circuit 2 divides an image input 1 into the two-dimensional square blocks of (8×8) pixels, for example. A 1st conversion circuit 8 simultaneously receives the input of a block image 3 of the circuit 2 and a pointer 7 of a coefficient counter A6. In the same way, a 2nd conversion circuit 14 successively receives a pointer 13 as well as every line of output 9 of conversion 1, i.e., the output of the circuit 8. Thus the circuit 14 performs an operation of conversion 2. Each of elements of a square matrix of output 15 of conversion 2 of the circuit 14 is supplied to a quantization circuit 20, and the corresponding quantization output 21 is acquired.</p> |
