| 摘要 |
By repeatedly adding items of picture element data representing an identical region of a serial picture element input which arrives serially in time, an improvement is effected in the S/N ratio of a periodic signal mixed in irregular, randomly occurring noise. A memory is provided for storing items of picture element data of one frame at storage locations corresponding to each of the picture elements. For each new item of picture element data that arrives, an item of picture element data of the same region accumulated and stored prior to said arrival is readout of the memory and added to the newly arrived data. The resulting sum is then written back into the memory at the same storage location. Thus, a single memory can be made to store picture data of enhanced S/N ratio merely by increasing slightly the bit storage capacity per data item in conformance with the number of times frames are accumulated.
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