摘要
为了提高三色光栅彩色摄影的数字解码速度,得到高质量的解码彩色图像,需选择适当的数字化频率。根据Nyquist采样定理,分析了采样频率fs,光栅频率fg和光栅数字化频率fgs三者之间的关系,找到了fs最佳值的确定方法。结果表明,对于20line/mm的三色光栅,fs的最佳值为2032d/i,不仅使解码时间缩短为原来的1/3,而且完整保留了编码图像的细节和彩色信息。fs最佳值的确定方法为三色光栅彩色数码摄影术的进一步成熟提供了依据。
In tricolor grating color photography, the digital frequency fs is a key parameter, which affects the decoding speed and the quality of the decoded image. Therefore, the value of fs should be determined. The triangle relation among digital frequency fs, gratings frequencyfg and gratings sampling frequency fgs is analyzed in accordance with the Nyquist sampling theorem. The method to determne the optimum value of parameter fs is obtained. The result shows that fs should be 2032 d/i when fg is 20 line/man. It has not only kept the original encoded image information completely but also improved the decoding speed to 3 times. It is of great benefit to the development of tricolor grating digital color photography and its further application in the future.
出处
《激光与光电子学进展》
CSCD
北大核心
2010年第3期74-77,共4页
Laser & Optoelectronics Progress
关键词
光栅
数字化频率
抽样定理
编码图像
傅里叶变换
gratings
digital frequency
sampling theorem
encoded image
Fourier transform
