FOV MTF RI & VOI

FOV MTF RI & VOI

FOV是 field of view 可看範圍

The field of view (also field of vision) is the (angular or linear or areal) extent of the observable world that is seen at any given moment.

Paraxial EFL--- 近軸有效焦長

Image circle 影像大小

Chief Ray Angle ---通過光圈的那條線就是Chief Ray ,Chief Ray 與光軸所形成的夾角就叫Chief Ray Angle


MTF 影像清晰度 MODULATION TRANSFER FUNCTION

RI 相對照度

VOI VOLUME OF INTREST

The purpose of a VOI analysis is to calculate the distribution of pixel values within delineated tissue structures. There are several VOI definitions available in PMOD.

Contour VOIs

In PMOD a contour VOI is defined as a stack of planar, closed polygons which are named ROIs (region-of-interest). The contours are manually or semi-automatically outlined on the loaded images, and the pixels contained within the contour boundaries are considered for the VOI statistics.

焦距﹑離焦﹑像差

Ｄｅｆｏｃｕｓｅｄｉｍａｇｅｓ

機器視覺中存在的離焦現象
採用該系統對物體進行面積測量時，由於被測
物體厚度的變化，引起實際物面偏離系統對準物面
（載物台表面），因而存在離焦成像現象．離焦成像時
ＣＤ採集到的圖像是模糊的


reference data : http://www.pmod.com/technologies/doc/pbas/640.htm

http://hi.baidu.com/wwgblog/blog/item/6d264cb5ae1260ce37d3ca72.html

http://blog.yam.com/ian1007/article/27088673