Invention Application
US20050018908A1 Method for compressing digital images to a predetermined size by calculating an optimal quality factor 审中-公开
通过计算最佳质量因子将数字图像压缩到预定尺寸的方法

Method for compressing digital images to a predetermined size by calculating an optimal quality factor
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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