IEEE Geoscience and Remote Sensing Magazine - December 2021 - 10

concentrates on challenges to and recent advances in addressing
these problems and can be summarized as follows:
◗ This article systematically analyzes the challenges of
small, weak target detection. According to their causes,
the challenges have been divided into three aspects: image
quality, object variations, and complex context.
◗ The technical evolution of object detection, including main
developments in the fields of computer vision and remote
sensing, is comprehensively involved; the existing benchmark
data sets and their contributions to small, weak object
detection are introduced and analyzed.
◗ The existing works that address the various challenges
are also summarized, and some promising research directions
into further improvements to small, weak object
detection are discussed.
DIFFICULTIES AND CHALLENGES IN REMOTE
SENSING SMALL, WEAK OBJECT DETECTION
GENERIC OBJECT DETECTION IN REMOTE SENSING
Object detection, a fundamental and essential task, has attracted
broad attention over the past decades. The task is
defined as follows: given a remote sensing image, determine
whether it includes instances of objects from predefined
categories, and, if it does, predict the spatial location and
the extent of each instance [27]. Although thousands of
geospatial objects occupy optical remote sensing images,
research scholars interested in this topic use the term objects
to refer to human-made or highly structured bodies (e.g.,
ships, vehicles, and airplanes) that have shape boundaries
and are independent of the background environment and
landscape items [11] rather than unstructured bodies or
scenes, such as the sky or clouds.
Generally, the spatial location and extent of an object
can be defined using a bounding box (BB) (a horizontal
or orientation rectangle tightly bounding the object) or
a precise pixelwise segmentation mask, as shown in Figure
1. Over the past several years, BB annotation has become
the most widely used method for evaluating detection
performance in remote sensing images; it can define
the location of an object by the corner coordinates of a
rectangle. The main advantage of this type of annotation
is that it focuses on locating only objects of interest, ignoring
the context. Therefore, it can greatly save labor costs
(a)
(b)
(c)
(d)
FIGURE 1. The different annotation types in the HRSC2016 [26] data set. (a) The original image, (b) the HBBs' annotation, (c) the OBBs' annotation,
and (d) the pixelwise segmentation mask.
10
IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE DECEMBER 2021

IEEE Geoscience and Remote Sensing Magazine - December 2021

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