IMAGE RESOLUTION CONVERSION METHOD AND APPARATUS
First Claim
1. An image resolution conversion method comprising:
- detecting an edge region and a direction of the edge region in an input low-resolution image frame in order to generate an edge map and edge direction information;
generating a directional point spread function based on the generated edge map and the edge direction information;
interpolating the input low-resolution image frame into a high-resolution image frame;
generating a residual term based on the input low-resolution image frame, the high-resolution image frame, and the directional point spread function; and
renewing the high-resolution image frame according to a result of comparing the residual term with a threshold.
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Abstract
An image resolution conversion method and apparatus based on a projection onto convex sets (POCS) method are provided. The image resolution conversion method comprises detecting an edge region and a direction of the edge region in an input low-resolution image frame in order to generate an edge map and edge direction information, generating a directional point spread function based on the edge map and the edge direction information, interpolating the input low-resolution image frame into a high-resolution image frame, generating a residual term based on the input low-resolution image frame, the high-resolution image frame, and the directional point spread function, and renewing the high-resolution image frame according to a result of comparing the residual term with a threshold.
25 Citations
23 Claims
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1. An image resolution conversion method comprising:
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detecting an edge region and a direction of the edge region in an input low-resolution image frame in order to generate an edge map and edge direction information; generating a directional point spread function based on the generated edge map and the edge direction information; interpolating the input low-resolution image frame into a high-resolution image frame; generating a residual term based on the input low-resolution image frame, the high-resolution image frame, and the directional point spread function; and renewing the high-resolution image frame according to a result of comparing the residual term with a threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An image resolution conversion apparatus comprising:
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an edge detection unit which detects an edge region and a direction of the edge region in an input low-resolution image frame in order to generate an edge map and edge direction information; a directional function generation unit which generates a directional point spread function based on the edge map and the edge direction information generated by the edge detection unit; an interpolation unit which interpolates the input low-resolution image frame into a high-resolution image frame; a residual term calculation unit which generates a residual term based on the input low-resolution image frame, the high-resolution image frame, and the directional point spread function; and an iteration unit which renews the high-resolution image frame according to a result of comparing the residual term with a threshold. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A computer-readable recording medium having recorded thereon a program for implementing an image resolution conversion method, the image resolution conversion method comprising:
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detecting an edge region and a direction of the edge region in an input low-resolution image frame in order to generate an edge map and edge direction information; generating a directional point spread function based on the generated edge map and the edge direction information; interpolating the input low-resolution image frame into a high-resolution image frame; generating a residual term based on the input low-resolution image frame, the high-resolution image frame, and the directional point spread function; and renewing the high-resolution image frame according to a result of comparing the residual term with a threshold.
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Specification