Effects of Image Compression on Image Quality

Ford, Adrian; Jacobson, Ralph E.; Attridge, G.G.

doi:10.1080/00223638.1995.11738616

Cited by 2 publications

(2 citation statements)

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“…Hence, changing the compression metric is intuitively a good transcoding metric for JPEG images. Earlier work [28][29][30] confirmed that JPEG compression metrics such as JPEG Quality Factor outperformed other measures in predicting the quality loss of an image.…”

Section: Transcoding That Changes the Jpeg Compression Metricmentioning

confidence: 54%

<title>Transcoding characteristics of Web images</title>

et al. 2000

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Transcoding is a technique employed by network proxies to dynamically customize multimedia objects for prevailing network conditions and individual client characteristics. Transcoding can be performed along a number of different axes and the specific transcoding technique used depends on the type of multimedia object. Our goal in this paper is to understand the nature of typical Internet images and their transcoding characteristics. We focus our attention on transcodings intended to customize an image for file size savings. Our results allow the developers of a transcoding proxy server to choose the appropriate transcoding techniques for the important classes of Internet images.We analyze the characteristics of images available on the Web through a representative trace. We show that most GIF images accessed on the Internet are small; about 80% of the GIF images are smaller than 6 KBs. JPEG images are larger than GIF images; about 40% of the JPEG images are larger than 6 KBs. We also establish the characteristics of popular image transcoding operations. We show that for JPEG images, the JPEG compression metric and a transcoding that reduces the spatial geometry are productive transcoding operations (saves at least 50% of the file size for 50% of the images). Our systematic study of image characteristics leads to some surprising results. For example, a naive spatial geometry reduction of GIF images by a factor of 2 along each axis actually causes to an increase in the file size compared to the original image for 40% of the images. Thus it is important to understand the characteristics of individual images before choosing the proper transcoding operation.

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Section: Transcoding That Changes the Jpeg Compression Metricmentioning

confidence: 54%

<title>Transcoding characteristics of Web images</title>

et al. 2000

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“…A reliable quality measure is a much-needed tool for determining the type and amount of image distortion. The method most commonly used for comparing the similarity of two images is to compute the PSNR [12], [13]. The first 3D integral image ) , ( j i f is generated by using fully integral ray tracing algorithm, and the second 3D integral image ) , ( j i g is obtained by using 3D integral interpolation algorithm.…”

Section: Expermital and Resultsmentioning

confidence: 99%

Enhanced Still 3D Integral Images Rendering Based on Multiprocessor Ray Tracing System

Eljdid¹,

Aggoun²,

Youssef³

2015

JOIG

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The main purpose of this paper is to introduce 3D integral imaging interpolation method, to overcome the 3D missing information problem occurred between cylindrical lenses (micro-images) due to occluded areas in the previous cylindrical lens, new cylindrical lens shows an area, to generate one single photo-realistic 3D integral imaging frame. The method is based on a Multiprocessor ray-tracer containing 3D integral imaging parser, 3D integral camera model, a 3D integral imaging renderer, spatial coherence and 3D scene transformations. Consequently, an increase in speed in the generation of still 3D integral image is achieved compared to fully ray tracing time of missing pixels. Experiments show that a significant reduction in execution time is achieved by using the 3D integral interpolation process. Savings up to (57%-66%) in the ray tracing time when compared to fully ray tracing the missing pixels depends on the complexity of the scene. 

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Effects of Image Compression on Image Quality

Cited by 2 publications

References 0 publications

<title>Transcoding characteristics of Web images</title>

<title>Transcoding characteristics of Web images</title>

Enhanced Still 3D Integral Images Rendering Based on Multiprocessor Ray Tracing System

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