Image processing apparatus and method that avoid generation of moire
First Claim
1. An image processing apparatus, comprising a spatial filtering unit which applies spatial filtering to input image data to generate filtered image data such that said spatial filtering provides a broader dynamic range for outputs than for inputs;
- and a high-resolution conversion unit which interpolates the filtered image data in a first direction by an average of values of two pixels adjacent in the first direction, in a second direction perpendicular to the first direction by an average of values of two pixels adjacent in the second direction, and in a direction diagonal to the first and second directions by an average of four pixels surrounding a pixel of interest, thereby converting the filtered image data into high-resolution image data.
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Abstract
An image processing apparatus includes a spatial filtering unit which applies spatial filtering to input image data to generate filtered image data such that the spatial filtering provides a broader dynamic range for outputs than for inputs, and a high-resolution conversion unit which interpolates the filtered image data in a first direction by an average of values of two pixels adjacent in the first direction, in a second direction perpendicular to the first direction by an average of values of two pixels adjacent in the second direction, and in a direction diagonal to the first and second directions by an average of four pixels surrounding a pixel of interest, thereby converting the filtered image data into high-resolution image data.
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Citations
11 Claims
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1. An image processing apparatus, comprising
a spatial filtering unit which applies spatial filtering to input image data to generate filtered image data such that said spatial filtering provides a broader dynamic range for outputs than for inputs; - and
a high-resolution conversion unit which interpolates the filtered image data in a first direction by an average of values of two pixels adjacent in the first direction, in a second direction perpendicular to the first direction by an average of values of two pixels adjacent in the second direction, and in a direction diagonal to the first and second directions by an average of four pixels surrounding a pixel of interest, thereby converting the filtered image data into high-resolution image data. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An information processing apparatus, comprising
an input unit which optically scans a document to generate input image data; -
a spatial filtering unit which applies spatial filtering to the input image data to generate filtered image data such that said spatial filtering provides a broader dynamic range for outputs than for inputs;
a high-resolution conversion unit which interpolates the filtered image data in a first direction by an average of values of two pixels adjacent in the first direction, in a second direction perpendicular to the first direction by an average of values of two pixels adjacent in the second direction, and in a direction diagonal to the first and second directions by an average of four pixels surrounding a pixel of interest, thereby converting the filtered image data into high-resolution image data, followed by limiting the dynamic range of the high-resolution image data; and
an output unit which prints, on a paper sheet, image data that has undergone predetermined processing after being output from said high-resolution conversion unit.
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8. An image processing apparatus, comprising:
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a high-resolution conversion unit which interpolates input image data in a first direction by an average of values of two pixels adjacent in the first direction, in a second direction perpendicular to the first direction by an average of values of two pixels adjacent in the second direction, and in a direction diagonal to the first and second directions by an average of four pixels surrounding a pixel of interest, thereby converting the input image data into high-resolution image data; and
a spatial filtering unit which applies spatial filtering to the high-resolution image data.
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9. A method of processing an image, comprising the steps of:
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applying spatial filtering to input image data to generate filtered image data such that said spatial filtering provides a broader dynamic range for outputs than for inputs; and
interpolating the filtered image data in a first direction by an average of values of two pixels adjacent in the first direction, in a second direction perpendicular to the first direction by an average of values of two pixels adjacent in the second direction, and in a direction diagonal to the first and second directions by an average of four pixels surrounding a pixel of interest, thereby converting the filtered image data into high-resolution image data. - View Dependent Claims (10, 11)
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Specification