Image resize using sinc filter in linear lumen space
First Claim
1. An apparatus for resizing a first image contained in a first array of digital pixels of a first sampling frequency to a second image contained in a second array of digital pixels of a second sampling frequency, comprising:
- means for receiving the first array of digital pixels;
a sinc digital filter for converting digital pixel values contained in the first array of digital pixels wherein the first digital pixel values are linearly representative of the brightness of light of the image as it is intended to be finally displayed to digital pixel values stored in the second array of digital pixels; and
means for outputting from the resizing apparatus the digital pixel values contained in pixels of the second array.
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Accused Products
Abstract
a scanner which converts an oversampled substrate image into a digital pixel array which may be at an arbitrary sampling frequency lower than the first sampling frequency. The scanner sensor converts the substrate image into an array of analog pixel at a first sampling frequency. Preferably the first sampling frequency substantially oversamples the image from the actual frequency desired in the final digital image. The analog pixels are converted into a first array of digital pixels. The first digital pixel array is converted by a sinc filter in the linear lumen domain, i.e. the digital pixels are linearly representative of the brightness of light sensed by the sensor, to a second array of pixels at a second sampling frequency. The second sampling frequency should be much lower than the first sampling frequency to produce high quality images with substantially fewer pixels than required by the prior art.
80 Citations
18 Claims
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1. An apparatus for resizing a first image contained in a first array of digital pixels of a first sampling frequency to a second image contained in a second array of digital pixels of a second sampling frequency, comprising:
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means for receiving the first array of digital pixels; a sinc digital filter for converting digital pixel values contained in the first array of digital pixels wherein the first digital pixel values are linearly representative of the brightness of light of the image as it is intended to be finally displayed to digital pixel values stored in the second array of digital pixels; and means for outputting from the resizing apparatus the digital pixel values contained in pixels of the second array. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for resizing a first image contained in a first array of digital pixels of a first sampling frequency to a second image contained in a second array of digital pixels of a second sampling frequency, comprising the steps of:
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receiving the first array of digital pixels; converting digital pixel values contained in the first array of digital pixels wherein the first digital pixel values are linearly representative of the brightness of light of the image as it is intended to be finally displayed to digital pixel values stored in the second array of digital pixels; and outputting from the resizing apparatus the digital pixel values contained in pixels of the second array. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A computer product in a computer readable medium for resizing a first image contained in a first array of digital pixels of a first sampling frequency to a second image contained in a second array of digital pixels of a second sampling frequency, comprising:
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means for receiving the first array of digital pixels; means for converting digital pixel values contained in the first array of digital pixels wherein the first digital pixel values are linearly representative of the brightness of light of the image as it is intended to be finally displayed to digital pixel values stored in the second array of digital pixels; and means for outputting from the resizing apparatus the digital pixel values contained in pixels of the second array. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification