Survey on Image Fusion: Hand Designed to Deep Learning Algorithms
Abstract—Image fusion is the process of
combining/integrating multiple images to generate the single
image having all meaningful information. The input/source
images are captured through various sensing devices under
different parameter setting. It is impossible to focus on all
information or all small objects in single image. Hence, Image
fusion methods provide the composite image known as fused
image with complementary information. Fused image should be
more suitable for human as well as machine perception.
Therefore, several methods have been developing to improve the
quality of images. Traditional methods include spatial and
transform domain based image fusion in which spatial domain
includes the fusion methods with pixel, blocks or segmentation
based processing. Whereas, transform domain utilizes the
transform theories to transform the image in another domain
rather than same domain of the input and performs fusion rule
on transformed image. Spatial domain methods produce spatial
and spectral distortion in the fused image whereas transform
methods often perform inadequately when images obtained from
different sensor modalities. Recently the concept of deep learning
has enlarged to enhance the development in image processing
and computer vision problems such as segmentation,
classification, super-resolution, etc. Deep learning algorithms
such as convolutional neural network (CNN), deep autoencoder
(DAE), and deep belief networks (DBN) with different category
of images such as multi-modal, multi-resolution, multi-temporal
and multi-focus have been proposed for image fusion. Its
applications include disease analysis, disaster assessment,
providing a complete information for diagnosis, detection of
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