IMAGE PROCESSING APPARATUS AND METHOD, RECORDING MEDIUM, AND PROGRAM
First Claim
1. An image processing apparatus comprising:
- contrast detecting means for detecting a contrast intensity of a target pixel being considered in a first image, the contrast intensity indicating an intensity of contrast in a region including and neighboring the target pixel;
flat-intensity detecting means for detecting a flat intensity of the target pixel on the basis of the contrast intensity, the flat intensity indicating a degree of smallness of change in pixel value relative to change in position in the region including and neighboring the target pixel;
edge-intensity detecting means for detecting an edge intensity of the target pixel on the basis of the contrast intensity, the edge intensity indicating a degree of largeness of change in pixel value relative to change in position in the region including and neighboring the target pixel;
flat-weight setting means for setting a flat weight for the target pixel, the flat weight being a weight that increases as flat intensities of pixels in the region including and neighboring the target pixel increase and that decreases as the flat intensities decrease;
edge-weight setting means for setting an edge weight for the target pixel, the edge weight being a weight that increases as edge intensities of the pixels in the region including and neighboring the target pixel increase and that decreases as the edge intensities decrease;
attenuating means for attenuating components in a predetermined frequency band of the first image to form a second image;
first combining means for combining the first image and the second image to form a third image by adding together pixel values of pixels at corresponding positions of the first image and the second image, using weights that are based on the flat weight;
edge enhancing means for enhancing edges in the third image to form a fourth image; and
second combining means for combining the first image and the fourth image by adding together pixel values of pixels at corresponding positions of the first image and the fourth image, using weights that are based on the edge weight.
1 Assignment
0 Petitions
Accused Products
Abstract
An image processing apparatus including a contrast detector that detects a contrast intensity of a pixel in a first image; a flat-intensity detector that detects a flat intensity of the pixel; an edge-intensity detector that detects an edge intensity of the pixel; a flat-weight setter that sets a flat weight for the pixel; an edge-weight setter that sets an edge weight for the pixel; an attenuator that attenuates components in a predetermined frequency band of the first image to form a second image; a first combiner that combines the first and second images to form a third image using weights based on the flat weight; an edge enhancer that enhances edges in the third image to form a fourth image; and a second combiner that combines the first and fourth images using weights based on the edge weight.
44 Citations
10 Claims
-
1. An image processing apparatus comprising:
-
contrast detecting means for detecting a contrast intensity of a target pixel being considered in a first image, the contrast intensity indicating an intensity of contrast in a region including and neighboring the target pixel; flat-intensity detecting means for detecting a flat intensity of the target pixel on the basis of the contrast intensity, the flat intensity indicating a degree of smallness of change in pixel value relative to change in position in the region including and neighboring the target pixel; edge-intensity detecting means for detecting an edge intensity of the target pixel on the basis of the contrast intensity, the edge intensity indicating a degree of largeness of change in pixel value relative to change in position in the region including and neighboring the target pixel; flat-weight setting means for setting a flat weight for the target pixel, the flat weight being a weight that increases as flat intensities of pixels in the region including and neighboring the target pixel increase and that decreases as the flat intensities decrease; edge-weight setting means for setting an edge weight for the target pixel, the edge weight being a weight that increases as edge intensities of the pixels in the region including and neighboring the target pixel increase and that decreases as the edge intensities decrease; attenuating means for attenuating components in a predetermined frequency band of the first image to form a second image; first combining means for combining the first image and the second image to form a third image by adding together pixel values of pixels at corresponding positions of the first image and the second image, using weights that are based on the flat weight; edge enhancing means for enhancing edges in the third image to form a fourth image; and second combining means for combining the first image and the fourth image by adding together pixel values of pixels at corresponding positions of the first image and the fourth image, using weights that are based on the edge weight. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. An image processing method comprising the steps of:
-
detecting a contrast intensity of a target pixel being considered in a first image, the contrast intensity indicating an intensity of contrast in a region including and neighboring the target pixel; detecting a flat intensity of the target pixel on the basis of the contrast intensity, the flat intensity indicating a degree of smallness of change in pixel value relative to change in position in the region including and neighboring the target pixel; detecting an edge intensity of the target pixel on the basis of the contrast intensity, the edge intensity indicating a degree of largeness of change in pixel value relative to change in position in the region including and neighboring the target pixel; setting a flat weight for the target pixel, the flat weight being a weight that increases as flat intensities of pixels in the region including and neighboring the target pixel increase and that decreases as the flat intensities decrease; setting an edge weight for the target pixel, the edge weight being a weight that increases as edge intensities of the pixels in the region including and neighboring the target pixel increase and that decreases as the edge intensities decrease; attenuating components in a predetermined frequency band of the first image to form a second image; combining the first image and the second image to form a third image by adding together pixel values of pixels at corresponding positions of the first image and the second image, using weights that are based on the flat weight; enhancing edges in the third image to form a fourth image; and combining the first image and the fourth image by adding together pixel values of pixels at corresponding positions of the first image and the fourth image, using weights that are based on the edge weight.
-
-
8. A program for causing a computer to execute processing comprising the steps of:
-
detecting a contrast intensity of a target pixel being considered in a first image, the contrast intensity indicating an intensity of contrast in a region including and neighboring the target pixel; detecting a flat intensity of the target pixel on the basis of the contrast intensity, the flat intensity indicating a degree of smallness of change in pixel value relative to change in position in the region including and neighboring the target pixel; detecting an edge intensity of the target pixel on the basis of the contrast intensity, the edge intensity indicating a degree of largeness of change in pixel value relative to change in position in the region including and neighboring the target pixel; setting a flat weight for the target pixel, the flat weight being a weight that increases as flat intensities of pixels in the region including and neighboring the target pixel increase and that decreases as the flat intensities decrease; setting an edge weight for the target pixel, the edge weight being a weight that increases as edge intensities of the pixels in the region including and neighboring the target pixel increase and that decreases as the edge intensities decrease; attenuating components in a predetermined frequency band of the first image to form a second image; combining the first image and the second image to form a third image by adding together pixel values of pixels at corresponding positions of the first image and the second image, using weights that are based on the flat weight; enhancing edges in the third image to form a fourth image; and combining the first image and the fourth image by adding together pixel values of pixels at corresponding positions of the first image and the fourth image, using weights that are based on the edge weight. - View Dependent Claims (9)
-
-
10. An image processing apparatus comprising:
-
a contrast detector configured to detect a contrast intensity of a target pixel being considered in a first image, the contrast intensity indicating an intensity of contrast in a region including and neighboring the target pixel; a flat-intensity detector configured to detect a flat intensity of the target pixel on the basis of the contrast intensity, the flat intensity indicating a degree of smallness of change in pixel value relative to change in position in the region including and neighboring the target pixel; an edge-intensity detector configured to detect an edge intensity of the target pixel on the basis of the contrast intensity, the edge intensity indicating a degree of largeness of change in pixel value relative to change in position in the region including and neighboring the target pixel; a flat-weight setter configured to set a flat weight for the target pixel, the flat weight being a weight that increases as flat intensities of pixels in the region including and neighboring the target pixel increase and that decreases as the flat intensities decrease; an edge-weight setter configured to set an edge weight for the target pixel, the edge weight being a weight that increases as edge intensities of the pixels in the region including and neighboring the target pixel increase and that decreases as the edge intensities decrease; an attenuator configured to attenuate components in a predetermined frequency band of the first image to form a second image; a first combiner configured to combine the first image and the second image to form a third image by adding together pixel values of pixels at corresponding positions of the first image and the second image, using weights that are based on the flat weight; an edge enhancer configured to enhance edges in the third image to form a fourth image; and a second combiner configured to combine the first image and the fourth image by adding together pixel values of pixels at corresponding positions of the first image and the fourth image, using weights that are based on the edge weight.
-
Specification