Patent ID: 7573506

Claim:
An imaging device-evaluation method comprising: obtaining by a computer an output function f(P) of original image data by comparing a plurality of pieces of image data obtained by imaging one spatial brightness distribution surface for different exposure times, a ratio k, and an nth object point brightness P n ; wherein the k is an exposure time ratio, the P n is an nth object point brightness in ascending order, and f(P n ) is an output brightness of first image data corresponding to the object-point brightness, and f(kP n ) is an output brightness of second image data corresponding to the object point brightness and the output function f(P) of the original image data is obtained based on the following expressions: R n - 1 = f ⁢ ⁢ ( kP n - 1 ) kf ⁢ ⁢ ( P n - 1 ) f ⁢ ⁢ ( P n ) = kP n - 1 - P n + kR n - 1 ⁡ ( P n - P n - 1 ) ( k - 1 ) ⁢ ⁢ P n - 1 ⁢ ⁢ f ⁢ ⁢ ( P n - 1 ) .