卫星图像中的车辆分析--A Large Contextual Dataset for Classification, Detection and Counting of Cars
卫星图像中的车辆分析--A Large Contextual Dataset for Classification, Detection and Counting of Cars
A Large Contextual Dataset for Classification, Detection and Counting of Cars with Deep Learning ECCV2016 https://gdo-datasci.ucllnl.org/cowc/
本文针对卫星图像中的车辆分析建立了一个新的数据库：Cars Overhead with Context (COWC)，然后使用几个 CNN网络对该数据库进行了分析：主要是分类、检测、计数
首先来看看这个新的数据库 Cars Overhead with Context (COWC) 数据库含有 32716个不同的车，来自6个不同的图像库，图像覆盖的区域包括：Toronto Canada [5], Selwyn New Zealand [6], Potsdam [7] and Vaihingen Germany [8], Columbus [9] and Utah [4] United States。 我们的数据库还标记了 58247个有用的负样本，这些样本和正样本比较相似，难以区分，Examples of these are boats, trailers, bushes and A/C units context is included around targets. Context can help tell us something may not be a car (is sitting in a pond?) or confirm it is a car (between other cars, on a road).
我们对输入图像做了一个归一化，不用考虑车辆的尺度问题。 standardized to 15cm per pixel at ground level from their original resolutions. This makes cars range in size from 24 to 48 pixels。 车辆在图像中的尺寸是 24-48像素之间。有灰度图像，也有彩色图像。 quality, appearance or rotation 这些都是不可控的，需要通过算法来解决
图像是像素级标记的，每个车在其中心点标记一个 dot The image set is annotated by single pixel points. All cars in the annotated images have a dot placed on their center
对 occlusions， Large trucks， Vans and pickups 做了相应的约定。
我们从卫星图像中间隔的裁出图像块分别作为训练图像和测试图像
测试场景
这里我们对新的数据库上完成三个任务： 1）two-class classifier，即判断图像块中有无车辆 2) detection and localization 3) vehicle counting 这里没有密度图，走检测计数的路线
4 Classification and Detection 设计了一个新的网络结构
我们从卫星图像中裁出 256 × 256 大小的图像块 a set of 308,988 training patches and 79,447 testing patches
4.1 Does Context Help?
从上面可以看出，context 增加到一定之后，性能就下降了。
4.2 Detection
5 Counting
我们是对卫星图像分块计数的。
5.2 Counting Efficiency
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