Title:
METHOD AND DEVICE FOR IMAGE PROCESSING
Document Type and Number:
Japanese Patent JPH01134578
Kind Code:
A
Abstract:
PURPOSE:To suppress the extraction of segments at a part where a contour line has a large curvature and to recognize an object accurately and speedily by setting a proper rectilinear threshold value in case a ridgeline is extracted from the distribution of size the gradient vectors of gradation images and applying polygonal approximation to the extracted ridgeline. CONSTITUTION:A segment tracking means 170 detects a ridgeline picture element string out of ridgeline picture element data stored in a ridgeline picture element memory means 100. A segment length measuring means 140 measures the rectilinear distance between a segment start picture element and a searching picture element. Then a polygonal approximation means 150 compares the value of the varying angle between the rectilinear distance and the gradient vector with a threshold value. When the varying angle exceeds the threshold value, a segment end point picture element is detected and a 1st segment is decided. Hereafter the segments are successively extracted out of the ridgeline picture element string. Then the polygonal approximation is applied to the contour line of an object.
Inventors:
MORIBE HIROSHI
SUKIGARA KAZUTOSHI
NAKANO KAN
KATO TOSHIO
ITO YOSHIAKI
SUKIGARA KAZUTOSHI
NAKANO KAN
KATO TOSHIO
ITO YOSHIAKI
Application Number:
JP29465187A
Publication Date:
May 26, 1989
Filing Date:
November 19, 1987
Export Citation:
Assignee:
TOYOTA CENTRAL RES & DEV
NIPPON DENSO CO
NIPPON DENSO CO
International Classes:
G06T7/60; (IPC1-7): G06F15/70
Domestic Patent References:
| JPS6075977A | 1985-04-30 |
Attorney, Agent or Firm:
Osamu Fujitani