PURPOSE: To optimize linearity correction and energy correction and prevent linearity, etc., from sacrificing for nonuniformity correction by making the nonuniformity correction after executing the linearity correction and energy correction.
CONSTITUTION: When the low-order seven digits of information stored in an address to which a random number generating circuit 6 outputs a random number of, for example, seven digits at random become smaller than the random number, a comparing circuit 7 supplies "1" to a timing signal generating circuit 8, and the most significant digit "0" is supplied from an nonuniformity correction memory 5 to put a hold and output circuit 4 in operation. An output circuit 3 generates position signals X' and Y' and an unblank signal and then the hold and output circuit 4 outputs the same position signals X' and Y' and unblank signal a specific time later. The probability that the low-order seven digits of information output successively are smaller than the random number corresponds to the ratio of the degree of nonuniformity appearing at a low side, and the position signals X' and Y' and unblank signal are added nearly according to the probability. The count number C of the position signal X' and Y' and unblank signal after the nonuniformity correction mentioned above is equal to a mean value M at every position.
TOCHI MASAAKI
TANAKA MITSUHIRO
| JPS54111879A | 1979-09-01 | |||
| JPS52137180A | 1977-11-16 |
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