Abstract: There are provided an image processing apparatus, line detection method and a computer-readable, non-transitory medium that can precisely detect boundaries of a document from a read image. The image processing apparatus includes an edge pixel extractor for extracting edge pixels from an input image, a line candidate detector for extracting a line candidate from the extracted edge pixels by using Hough transformation, and a line detector for detecting a line from edge pixels within a predetermined distance from the line candidate by using the least square method.

Abstract: Provided are an image processing apparatus, a region determining method and a computer-readable, non-transitory medium that can appropriately determine a cutting off region from a read image. The image processing apparatus includes an edge pixel extractor for extracting edge pixels from an input image, a region detector for detecting a subject region surrounded by connected edge pixels among the edge pixels, a straight line detector for detecting a plurality of straight lines within the subject region, a rectangle region detector for detecting a rectangle region formed of four straight lines where two straight lines each are substantially at right angles to each other among the plurality of straight lines, and a region determination module for determining the rectangle region as a cutting off region from the input image when the rectangle region and the subject region are substantially the same.

Abstract: There are provided an image processing apparatus, line detection method and a computer-readable, non-transitory medium that can precisely detect boundaries of a document from a read image. The image processing apparatus includes an edge pixel extractor for extracting edge pixels from an input image which includes a document, a grouping unit for forming mutually adjoining edge pixels in the extracted edge pixels into a group, and an approximated line detector for detecting a line which connects edge pixels which are positioned at the two ends in a horizontal direction and vertical direction among edge pixels which are included in the group as a line which approximates an end of the document.

Abstract: Provided are an image processing apparatus, a region determining method and a computer-readable, non-transitory medium that can appropriately determine a cutting off region from a read image. The image processing apparatus includes an edge pixel extractor for extracting edge pixels from an input image, a region detector for detecting a subject region surrounded by connected edge pixels among the edge pixels, a straight line detector for detecting a plurality of straight lines within the subject region, a rectangle region detector for detecting a rectangle region formed of four straight lines where two straight lines each are substantially at right angles to each other among the plurality of straight lines, and a region determination module for determining the rectangle region as a cutting off region from the input image when the rectangle region and the subject region are substantially the same.

Abstract: There are provided an image processing apparatus, rectangle detection method and a computer-readable, non-transitory medium that can precisely detect boundaries of a document from a read image. The image processing apparatus includes an edge pixel extractor for extracting edge pixels from an input image, a line extractor for extracting a plurality of lines from the extracted edge pixels, a rectangle candidate extractor for extracting a plurality of rectangle candidates each of which is comprised of four lines, and a rectangle selector for, for each of the plurality of rectangle candidates, finding a number of edge pixels within a predetermined distance of each side of the rectangle candidate, using a distribution of edge pixels as the basis to find a corner likeness of each corner, and using the number of edge pixels and degree of corner likeness as the basis to select a rectangle from the plurality of rectangle candidates.

Abstract: There are provided an image processing apparatus, rectangle detection method and a computer-readable, non-transitory medium that can precisely detect boundaries of a document from a read image. The image processing apparatus includes an edge pixel extractor for extracting edge pixels from an input image, a line extractor for extracting a plurality of lines from the extracted edge pixels, a rectangle candidate extractor for extracting a plurality of rectangle candidates each of which is comprised of four lines, and a rectangle selector for, for each of the plurality of rectangle candidates, finding a number of edge pixels within a predetermined distance of each side of the rectangle candidate, using a distribution of edge pixels as the basis to find a corner likeness of each corner, and using the number of edge pixels and degree of corner likeness as the basis to select a rectangle from the plurality of rectangle candidates.

Abstract: There are provided an image processing apparatus, line detection method and a computer-readable, non-transitory medium that can precisely detect boundaries of a document from a read image. The image processing apparatus includes an edge pixel extractor for extracting edge pixels from an input image, a line candidate detector for extracting a line candidate from the extracted edge pixels by using Hough transformation, and a line detector for detecting a line from edge pixels within a predetermined distance from the line candidate by using the least square method.

Abstract: There are provided an image processing apparatus, line detection method and a computer-readable, non-transitory medium that can precisely detect boundaries of a document from a read image. The image processing apparatus includes an edge pixel extractor for extracting edge pixels from an input image which includes a document, a grouping unit for forming mutually adjoining edge pixels in the extracted edge pixels into a group, and an approximated line detector for detecting a line which connects edge pixels which are positioned at the two ends in a horizontal direction and vertical direction among edge pixels which are included in the group as a line which approximates an end of the document.