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Subjective and objective quality evaluation of synthetic and high dynamic range images
Recent years have seen a huge growth in the acquisition, transmission, and storage of videos. The visual data consists of both natural scenes as well as synthetic scenes, such as animated movies, cartoons and video games. In all these cases, the ultimate goal is to provide the viewers with a satisfactory quality-of-experience. In addition to the traditional 8-bit images, high dynamic range imaging is also becoming popular because of its ability to represent the real world luminances more realistically. Coming up with objective image quality assessment algorithms for these applications is an interesting research problem. In this work, I have developed a synthetic image quality database by introducing varying degrees of different types of distortions and conducted a subjective experiment in order to obtain the ground-truth data. I evaluated the performance of state-of-the-art image quality assessment algorithms (typically meant for natural images) on this database, especially no-reference algorithms that have not been applied to the domain of computer graphics images before. I identified the top-performing algorithms along with analyzing the types of distortions on which the present algorithms show a less impressive performance. For high dynamic range(HDR) images, I have designed two new full-reference image quality assessment algorithms to judge the quality of tonemapped HDR images using statistical features extracted from them. I have also conducted a massive online crowd-sourced subjective test for HDR image artifacts arising from tonemapping, multiple-exposure fusion and post processing. To the best of our knowledge, presently this is the largest HDR image database in the world involving the largest number of source images and most number of human evaluations. Based on the subjective evaluations obtained, I have also proposed machine learning based no-reference image quality assessment algorithms to predict the perceptual quality of HDR images.Electrical and Computer Engineerin
A New Image Quality Database for Multiple Industrial Processes
Recent years have witnessed a broader range of applications of image
processing technologies in multiple industrial processes, such as smoke
detection, security monitoring, and workpiece inspection. Different kinds of
distortion types and levels must be introduced into an image during the
processes of acquisition, compression, transmission, storage, and display,
which might heavily degrade the image quality and thus strongly reduce the
final display effect and clarity. To verify the reliability of existing image
quality assessment methods, we establish a new industrial process image
database (IPID), which contains 3000 distorted images generated by applying
different levels of distortion types to each of the 50 source images. We
conduct the subjective test on the aforementioned 3000 images to collect their
subjective quality ratings in a well-suited laboratory environment. Finally, we
perform comparison experiments on IPID database to investigate the performance
of some objective image quality assessment algorithms. The experimental results
show that the state-of-the-art image quality assessment methods have difficulty
in predicting the quality of images that contain multiple distortion types
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