| 摘要 |
PURPOSE:To save the process detecting the period of network point intervals and to reduce the hardware and processing time, by processing video element data through blocking it into a pair of white and black continuous dots. CONSTITUTION:An original video data Din is received at a blocking circuit 51 to form the block of pairs of white and black continuous dots, the preceding block is set to a shift register 53, and the succeeding block is set to a shift register 55. At the same time, the preceding block length L1 is set to a register 52, the preceding block L2 is set to a register 54, the block lengths L1, L2 from the registers 52, 54 are received at a control circuit 56, and the both are compared. When the block length L1 is equal to L2, the data in L2 bit from the head is set to the registers 52, 54 and when L1 L2, the data in L2+1-bit length is set, and the error between blocks is detected and outputted with an exclusive OR 58 under the control of the counter 57. |
