| 摘要 |
PURPOSE:To remove an impulse noise by outputting an output data of an intermediate value selecting circuit as it is when an output of the intermediate value selecting circuit coincides with a data of a center position of an operating area and outputting an average value of an average value calculating circuit when they do not coincide with each other. CONSTITUTION:An unit data delay circuit 1 and an unit line delay circuit 2 extract an operation area of 3X3. The data in the extracted operating area is all except for a data e at a center position of an operating area inputted to an average value calculating circuit 3 and an extremum detecting circuit 4. A maximum value k and a minimum value l detected in the circuit 4 are inputted to an intermediate value selecting circuit 5 together with the data e, the intermediate value is selected and a signal p is obtained. The signal p is inputted together with an intermediate value j of the output of the data e and of the circuit 3 to a data selecting circuit 6. If the data e is larger or smaller than any other data in all the operating areas, it is judged that the data is disturbed by an impulse noise and it is replaced by an average value of other data in other operating area and in another cases, the data is not receive any change.
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