| 摘要 |
PROBLEM TO BE SOLVED: To perform data processing such as differentiation without making deterioration of data by sequentially extracting a one-dimensional data stream from two-dimensional processing data and calculating an approximation expression by approximating the one-dimensional data stream with a polynomial that uses a Chebyshev function. SOLUTION: Two-dimensional image data D(I, J) consists of pixel position data z in the directions X and Y of each pixel and pixel data y(z) which shows gradation. Dot column image data D(J) of a J-th column are extracted among the data D(I, J) after resetting a variable J that shows the position of a pixel column to be extracted there. An approximate expression is calculated by approximating the extracted one-dimensional data stream D(J) with a polynomial that uses a Chebyshev function. A differential expression of the approximate expression is calculated by differentiating the approximate expression and the differential value of processing data is acquired by calculating the differential value of each data of the data stream D(J) by using the differential expression. In such cases, because an approximate expression that uses the Chebyshev function is an aperiodic function, it approximates even to processing data in which values arbitrarily fluctuate with high accuracy. |
