数字影像又称数字图像。即数字化的影像。基本上是一个二维矩阵,每个点称为像元。
像元空间坐标和灰度值均已离散化,且灰度值随其点位坐标而异。数字影像可直接在航天或航空遥感的扫描式传感器成像时产生,并记录在磁带上;也可利用影像数字化装置对模拟像片进行数字化,也记录在数字磁带上。数字影像像元数及像元灰度的量化级数,通常取2的整数幂。一般灰度量化级数最多为28即256级。数字影像表达方式可通过傅里叶变换由“空间域”形式转变为“频率域”形式,且可进行各种数字图像处理,如数据压缩、影像增强、自动分类等。
数码摄影指的是完全以一种有规则的数字量的集合来表现的物理图案。数码的特点是:灰阶动态范围大;密度分辨率相对较高;线性好;层次丰富;可进行后处理;辐射剂量小,数码影像与传统影像相比,成像原理、记录载体、传输方式,处理方式都发生了彻底的改变。在方便性、拍摄成本、拍摄效果、后期处理、灵活性等方面都有着无可比拟的优势。数码摄影的后期制作,是在所谓的“电子暗房”里,利用电脑软件,按摄影者的创作意图调整和改善画面,软件的强大图像处理功能,可以使创作者发挥极强的主观能动性。
关于医疗机器人介绍的英语作文?
Robot Elena
The name of the robot I want to invent is Elena. She is as tall as me. Her body is white and fat. It feels like a round balloon.
Elena's head is round, her eyes are big, and she has a small mouth. The most important thing is that her voice is not as hard as other robots, but very soft, so that she can be closer to us!
Every morning, Elena wakes me up and makes a special nutritious breakfast. She makes a variety of breakfast. She protected me like a bodyguard, so my parents didn't have to worry about my safety.
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