Endoscope measurement apparatus for calculating approximate expression of line projected onto object to measure depth of recess or the like
AssigneeOlympus Optical Co., Ltd.
InventorKatsunori Sakiyama
Life of this patent
Estimating the term…
Abstract
A line projection part provided on a distal-end part of an endoscope for projecting a light of a line toward the side of an object. A plurality of points are assigned on a line which is projected so as to pass through a recess or the like which resides in an object surface, to calculate an approximate line which expresses the line three-dimensionally. Further, a measurement point is assigned onto the line which passes through the recess, to find a three-dimensional coordinate thereof. A distance from the three-dimensional coordinate to the approximate line is found to calculate a depth of the recess or the like.
Claims29
An endoscope measurement apparatus comprising:
- an endoscope having an elongated insertion part, an illumination optical system provided on the distal end of said insertion part, for outputting an illumination light to an object, an object optical system provided on the distal end of said insertion part for focusing an image of the object which is illuminated by said illumination light, reference-line projection means provided on the distal end of said insertion part for projecting a single reference line which passes through a recess or a projection residing on a plane of said object, and an image pickup element for photoelectrically converting an image on the basis of said object optical system;
- signal processing means which conducts signal processing with respect to said image pickup element, to generate an image signal;
- display means into which said image signal is inputted, for displaying an image corresponding to said object upon which said reference line is superimposed;
- position assignment means for assigning a position of said image;
- and
- operation means for carrying out calculation of an expression of an approximate line which three-dimensionally approximates the reference line passing through said plane, the operation means calculating a three-dimensional coordinate position corresponding to a point which is assigned by said position assignment means, on the reference line which passes through said recess or said projection, and the operation means calculating the depth of said recess or the height of the projection by an operation using a distance between said approximate line and said three-dimensional coordinate position.
A method of measuring a depth of a recess or a height of a projection, comprising:
- a first step of projecting a light or a shadow in the form of a single line from a reference-line projection means which is provided on the side of a distal end of an endoscope which is provided with image pickup means, onto a plane of an object in or on which the recess or the projection resides, to form a reference line which passes through said plane, and said recess or said projection;
- a second step of image-picking up said object by said image pickup means, to assign a plurality of points on the reference line which passes through said plane in the image of said object which is displayed by said display means;
- a third step of assigning a measurement point to measure the depth or the height of said recess or projection at said measurement point along the reference line which passes through said recess or said projection in an image of said object;
- and
- a fourth step of conducting calculation of the expression of the approximate line which expresses three-dimensionally the reference line which passes through said plane and which serves as the reference of measurement and calculation of a three-dimensional coordinate of said measurement point, by the assignment of said plurality of points, and further calculating a distance from said measurement point to said approximate line to calculate the depth of said recess or the height of said projection.
Dependencies are inferred from the claim text.