Fast access to reduced-resolution subsamples of high-resolution images

Details Fast access to reduced-resolution subsamples of high-resolution images Fast access to reduced-resolution subsamples of high-resolution images

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1460...80i&link_type=abstract

Proc. SPIE Vol. 1460, p. 80-91, Image Handling and Reproduction Systems Integration, Walter R. Bender; Wil Plouffe; Eds.

Astronomy and Astrophysics

Astronomy

Scientific paper

Frequently, displaying a digital image requires reducing the volume of data contained in a high-resolution image. This reduction can be performed by sub- sampling pixels from the high resolution image. Some examples of systems that need fast access to reduced resolution images are: modern digital prepress production; flight simulators; terrestrial planetary and astronomical imaging systems. On standard workstations, a lower resolution image cannot be read without essentially reading the whole high-resolution image. This paper demonstrates a method that allows fast access to lower scale resolution images. The method has the following characteristics. The proposed storage format greatly lessens the time needed to read a low-resolution image typically by an order of magnitude. The storage format supports efficient reading of multiple scale reduced resolutions. The image file size remains the same as in current formats. No penalty is imposed by using this new format for any operation that uses the image at full resolution. Additionally, an efficient method for rotating images in this format is demonstrated that is many times faster than methods currently employed. The last section gives benchmarks that demonstrate the utility of this format for reading an image at low resolution.

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