彩色照相材料信道容量的研究

本文从信息论观点出发,将彩色照相材料作为一个客观景物信息的传输通道,其单个空间可分辨面积构成一个独立信道,照相材料是大量独立信道并联组成的扩展信道,并提出了使用复层Shannon熵计算彩色照相材料独立信道容量的方法。作者在PDS显微光密度计——电子计算机系统上发展了全套测试计算程序,并完成了中国1821型彩色红外航空负片的信道容量测试。

THE CHANNEL CAPACITY OF COLOR PHOTOGRAPHIC MATERIALS

A photographic film can be regarded as an information transmission channel. In this case, input is the optical image and output is the photographic image. Although the image information is continuative and should be treated as a continuous information channel, it can be simplified to a discrete channel and treated by a shrinkaging quasi-noiseless channel model due to the existance of graininess in photographic materials. In this paper, the channel capacity of color photographic materials was studied using the concept of muti-layer Shannon's entropy and parallel information channels, and a calculating formula was derived. The Color Infrared Aero Negative Film Typa 1821 was selected as the sample. A set of measurement and calculation programmes on the PDS microdensitometer-computer system were developed.