1 May 2012 Measuring image quality performance on image versions saved with different file format and compression ratio
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Abstract
Digitization of existing documents containing images is an important body of work for many archives ranging from individuals to institutional organizations. The methods and file formats used in this digitization is usually a trade off between budget, file volume size and image quality, while not necessarily in this order. The use of most commons and standardized file formats, JPEG and TIFF, prompts the operator to decide the compression ratio that affects both the final file volume size and the quality of the resulting image version. The evaluation of the image quality achieved by a system can be done by means of several measures and methods, being the Modulation Transfer Function (MTF) one of most used. The methods employed by the compression algorithms affect in a different way the two basic features of the image contents, edges and textures. Those basic features are too differently affected by the amount of noise generated at the digitization stage. Therefore, the target used in the measurement should be related with the features usually presents in general imaging. This work presents a comparison between the results obtained by measuring the MTF of images taken with a professional camera system and saved in several file formats compression ratios. In order to accomplish with the needs early stated, the MTF measurement has been done by two separate methods using the slanted edge and dead leaves targets respectively. The measurement results are shown and compared related with the respective file volume size.
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Carles Mitjà, Jaume Escofet, Toni Bover, "Measuring image quality performance on image versions saved with different file format and compression ratio", Proc. SPIE 8436, Optics, Photonics, and Digital Technologies for Multimedia Applications II, 843617 (1 May 2012); doi: 10.1117/12.922354; https://doi.org/10.1117/12.922354
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