Method for compressing digital images to a predetermined size by calculating an optimal quality factor
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United States of America Patent
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Issued Date -
Jan 27, 2005
app pub date -
May 12, 2004
filing date -
Nov 13, 2001
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Abandoned
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Abstract
A method for compressing a digital image composed of a matrix of pixels to provide a compressed digital representation of said image of a predetermined size, the quality of the compressed digital representation being affected by a compression quality factor Q and the method including the fol-lowing steps: for a particular image producing device, developing a mathematical model defining a relationship between the content of the digital image and Q, developing said mathematical model by repeatedly compressing a set of digital test images with varying Q until each test image is compressed to a predetermined size, determining a metric M representing the content of the digital image, applying said metric M in said mathematical model to obtain an image determined quality factor Qmod and compressing the digital image using said quality factor Qmod.
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