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三恩时枯叶测试灰卡降噪中低对比度噪点测试

YE0265枯叶目标用于分析“纹理损失"，这是由于降噪或其他图像处理技术导致的图像中低对比度，精细细节的损失。

YE0265包括四个项目：

•背景

所有以下项目放在中性灰色背景上，灰度为18％

•注册标记

在测试图上放置四个对准标记，每个角上一个。这些标记用于分析软件中的自动注册，例如。图像工程iQ分析器

•灰色补丁

图卡包含16个灰色补丁。 这些补丁的反射在最亮补丁和最暗补丁之间是线性间隔的。

•枯叶模式

主要项目是所谓的死树叶模式。该图案由彼此堆叠的圆圈组成，具有已知的位置，半径和灰度级分布。灰度级限于最大可实现对比度的80％的最大对比度。 

推荐用法：

我们建议以这种方式使用被测设备再现图表，图卡填充不超过图像高度的1/3。

如果此图卡填充1/3的图像高度，它可以用于摄像机的采样率高达30万像素。 

枯叶模式及其属性在本文中描述：

“闭塞模型自然意象：一个尺度不变枯叶模型的统计研究"

由李安，戴维·芒福德和竞岗黄，国际计算机视觉41（1/2），35-59，2001

对于图像的基于软件的分析，捕获的YE0265，你可以使用图像工程IQ-分析第5版和更新。该软件将提供衡量这个目标的空间频率响应（SFR）。

The YE0265 Dead Leaves Target is used for the analysis of 'texture loss', which is the loss of low contrast, fine details in images due to noise reduction or other image processing techniques. 

The YE0265 consists of four items: 

• Background

All following items are placed on a neutral gray background with a gray level of 18% 

• Registration marks

Four registration marks are placed on the test chart, one in each corner. These marks are used for the automatic registration in analysis software, e.g. the Image Engineering iQ-Analyzer 

• Gray patches

The chart contains 16 gray patches. The reflection of these patches is linear spaced between the brightest patch and the darkest patch. 

• Dead Leaves Pattern

The main item is the so called Dead Leaves pattern. This pattern consists of circles stacked on top of each other with a known distribution of position, radius and gray level. The gray levels are limited to a maximum contrast of 80% of the maximum achievable contrast. 

Recommended usage: 

We recommend to reproduce the chart with the device under test in that way, that the chart fills not more than 1/3 of the image height. 

In case this chart fills 1/3 of the image height it can be used for cameras with a sampling rate of up to 30 Megapixels. 

The Dead Leaves pattern and its properties are described in this paper: 

"Occlusion Models for Natural Images: A Statistical Study of a Scale-Invariant Dead Leaves Model" 

by Ann Lee, David Mumford, and Jinggang Huang , International Journal of Computer Vision 41(1/2), 35-59, 2001 

For the software based analysis of images, captured of the YE0265, you can use the Image Engineering iQ-Analyzer Version 5 and newer. This software will provide the Spatial Frequency Response (SFR) measured on this target.

三恩时枯叶测试灰卡降噪中低对比度噪点测试