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Paper details
Number 4 - December 2018
Volume 28 - 2018
Impact of low resolution on image recognition with deep neural networks: An experimental study
Michał Koziarski, Bogusław Cyganek
Abstract
Due to the advances made in recent years, methods based on deep neural networks have been able to achieve a state-of-the-art performance in various computer vision problems. In some tasks, such as image recognition, neural-based approaches
have even been able to surpass human performance. However, the benchmarks on which neural networks achieve these
impressive results usually consist of fairly high quality data. On the other hand, in practical applications we are often faced
with images of low quality, affected by factors such as low resolution, presence of noise or a small dynamic range. It is
unclear how resilient deep neural networks are to the presence of such factors. In this paper we experimentally evaluate the
impact of low resolution on the classification accuracy of several notable neural architectures of recent years. Furthermore,
we examine the possibility of improving neural networks’ performance in the task of low resolution image recognition
by applying super-resolution prior to classification. The results of our experiments indicate that contemporary neural
architectures remain significantly affected by low image resolution. By applying super-resolution prior to classification
we were able to alleviate this issue to a large extent as long as the resolution of the images did not decrease too severely.
However, in the case of very low resolution images the classification accuracy remained considerably affected.
Keywords
image recognition, deep neural networks, convolutional neural networks, low resolution, super-resolution