前移补偿小比例尺航摄底片影象质量的评定与分析

On the Eualuation and Analysis of Image Quality of Rmall Rcale Negatives with Forward Motion Compensation

影响小比例尺航空摄影质量及其量测性能的主要因素是像移或者软片性能,这是在 1:5 万地形图修测中选定摄影方案时应该考虑的主要问题之一。为此,本文就两种高分辨率测图软片(柯达 2412和国产双—200)与两种高感光度软片(柯达 2402和国产HV—2)所摄取的航摄底片进行了影象质量的分析和量测性能的比较,其中高分辨率软片使用了象移补偿装置,其结论是:在1:5万和1:8万摄影比例尺情况下,象移补偿装置对提高影象质量甚微,而影响影象质量的主要因素在于感光材料的微观特性。

In working out flight planning ot small scale serial photographs for the revisiontopogprahic maps at the scale of 1: 50000, it is quite important to Consider with one isa main facter effecting on the quality of small scale aerial photographs and its measur-ing performance: either image forward motion or film characteristics. In view of thisproklem, the test of image quality analysis and the comparsion of measuring pfrformancewere carried out using two kinds of film with different resolution and three photographscale among them the Forward Motion Compensation Camera has been used for the filmof high resolution. Based on the enalysis of experiments it has bee shown that, the main factor effect-ing on the quality of photograph at scalas of 1:50000 and 1:80000 is the macro—char-acterisfic of film, and the effects of FMC on image quality could be omited.