Perceptibility and acceptability of JPEG 2000 compressed images of various scene types
Perceptibility and acceptability of JPEG 2000 compressed images of various scene types
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DOI：
10.1117/12.2042582
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发表时间：
2014-01
影响因子：
2.7
通讯作者：
E. Allen;S. Triantaphillidou;R. E. Jacobson
中科院分区：
文献类型：
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作者：
E. Allen;S. Triantaphillidou;R. E. Jacobson
本研究探讨了图像保真度，可接受阈值和场景内容之间的关系，图像失真压缩。一组具有广泛代表性场景内容的图像样本的场景特征被量化，使用简单的度量（场景度量），这些度量先前被发现与全局场景亮度、全局对比度、繁忙度和色彩度相关。使用有损JPEG 2000算法将图像压缩到一定范围的压缩比，逐渐将失真引入到超过检测阈值的水平。12名观察者参加了配对比较实验，以评估感知阈值压缩比。进一步的心理物理实验使用相同的场景，压缩到更高的压缩比，以确定压缩的图像在视觉上变得不可接受的水平。测试图像集的感知阈值和可接受阈值显著相关；这两个阈值也与忙碌度指标相关。根据可感知性和可接受性之间的关系，对两个阈值的图像进行排名，并进一步分组。在组内检查场景内容和场景描述器的结果，以确定特定的共同场景特征对两个阈值的影响。
This investigation examines the relationships between image fidelity, acceptability thresholds and scene content for images distorted by lossy compression. Scene characteristics of a sample set of images, with a wide range of representative scene content, were quantified, using simple measures (scene metrics), which had been previously found to correlate with global scene lightness, global contrast, busyness, and colorfulness. Images were compressed using the lossy JPEG 2000 algorithm to a range of compression ratios, progressively introducing distortion to levels beyond the threshold of detection. Twelve observers took part in a paired comparison experiment to evaluate the perceptibility threshold compression ratio. A further psychophysical experiment was conducted using the same scenes, compressed to higher compression ratios, to identify the level of compression at which the images became visually unacceptable. Perceptibility and acceptability thresholds were significantly correlated for the test image set; both thresholds also correlated with the busyness metric. Images were ranked for the two thresholds and were further grouped, based upon the relationships between perceptibility and acceptability. Scene content and the results from the scene descriptors were examined within the groups to determine the influence of specific common scene characteristics upon both thresholds.