Method and apparatus for obtaining magnification error for image scanning apparatus
AssigneeMustek Systems Inc.
InventorsJenn-Tsair Tsai, Bill Chen
Life of this patent
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Abstract
A method and an apparatus for obtaining a magnification error in a first direction for an image scanning apparatus is disclosed. The method includes steps of (a) providing a marking pattern having a particular length in the first direction, (b) scanning the marking pattern to obtain a scanning length in the first direction, and (c) calculating the magnification error in the first direction from scanning length and the particular length.
Claims20
A method for determining a magnification error caused by an automatic driving device of a scanned image of an object in a scanning direction for an image scanning apparatus, comprising steps of:
- a) providing a marking pattern having a particular length in said scanning direction;
- b) scanning said marking pattern along said scanning direction to obtain a scanning length;
- and
- c) calculating said magnification error by mathematically operating said scanned length and said particular length.
An image scanning apparatus allowing a magnification error caused by an automatic driving device in a scanning direction to be modified, comprising:
- a scanning platform for placing thereon an object to be scanned;
- a marking pattern defining a particular length in said scanning direction on said scanning platform;
- an image-pickup device for picking data representative of an image of said object, and obtaining a scanned length of said marking pattern in said scanning direction;
- a driving device connected to said image-picking device for automatically driving said image picking device to move step by step in said scanning direction to scan said object and said marking pattern;
- and wherein said marking pattern is arranged beside said object on said scanning platform so that said marking pattern and said object are scanned by said image-picking device synchronously.
An image scanning apparatus allowing a magnification error caused by an automatic driving device in a scanning direction to be modified, comprising:
- a scanning platform for placing thereon an object to be scanned;
- a plurality of marking patterns attached onto said scanning platform, and equally spaced by a background color in said scanning direction;
- an image-picking device for picking and converting an image of said object into digital data, and realizing a scanned length of selected two of said marking patterns in said scanning direction;
- and
- a driving device connected to said image-picking device for automatically moving said image-picking device in said scanning direction to pass through said object and said selected two of marking patterns.
A method for determining a magnification modifying factor for modifying a magnification error of a scanned image of an object in a scanning direction for an image scanning apparatus, comprising steps of:
- providing a plurality of marking patterns equally spaced in said scanning direction;
- selecting two of said marking patterns of a particular length therebetween according to the length of said object in said scanning direction;
- scanning said object along said scanning direction to realize digital data representative of an image of said object;
- scanning said selected two of marking patterns along said scanning direction to realize a scanned length between said two marking patterns;
- and
- calculating said magnification modifying factor by mathematically operating said scanned length and said particular length.
Dependencies are inferred from the claim text.