Image processing apparatus, image processing method, and computer product
AssigneeFujitsu Limited
InventorYoshihiro ISHIMARU
Life of this patent
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Abstract
An image processing apparatus includes a contour extraction unit and a contour correcting unit. The contour extraction unit ascertains intensity difference between each of the pixels in the original image data and pixels around the pixel, and evaluates sharpness of a contour to determine intensity of a pixel in the contour image data based on gradient of intensity of the pixel. The contour correcting unit shifts a contour of the pixel in a predetermined direction based on a direction of a slant of the gradient of intensity when an absolute value of the gradient of intensity is larger than threshold.
Claims15
An image processing apparatus that generates contour image data indicative of a contour in original image data, the image processing apparatus comprising:
- a calculating unit that calculates intensity difference between each pixel in the original image data and pixels around the pixel;
- a contour extracting unit that extracts a first pixel as belonging to a contour in the contour image data when an absolute value of intensity difference between intensity of the first pixel and intensity of a second pixel adjacent to the first pixel is larger than a threshold;
- and
- a contour correcting unit that corrects the contour based on whether the intensity of the first pixel is larger than the intensity of the second pixel.
A method of generating contour image data indicative of a contour in original image data, the method comprising:
- calculating intensity difference between each pixel in the original image data and pixels around the pixel;
- extracting a first pixel as belonging to a contour in the contour image data when an absolute value of intensity difference between intensity of the first pixel and intensity of a second pixel adjacent to the first pixel is larger than a threshold;
- and
- correcting the contour based on whether the intensity of the first pixel is larger than the intensity of the second pixel.
A computer-readable recording medium that stores therein a computer program that causes a computer to generate contour image data indicative of a contour in original image data, the computer program causing the computer to execute:
- calculating intensity difference between each pixel in the original image data and pixels around the pixel;
- extracting a first pixel as belonging to a contour in the contour image data when an absolute value of intensity difference between intensity of the first pixel and intensity of a second pixel adjacent to the first pixel is larger than a threshold;
- and
- correcting the contour based on whether the intensity of the first pixel is larger than the intensity of the second pixel.
Dependencies are inferred from the claim text.