Two dimensional generating system for the geometry of a model using artificial vision

• US 5,041,961 A
• Filed: 04/28/1989
• Issued: 08/20/1991
• Est. Priority Date: 07/12/1988
• Status: Expired due to Fees

• Current Assignee: ONA Electro-Erosion
• Original Assignee: Ona Electro-Erosion, S.A.
• Inventors: Inaki, Goiricelaya
• Primary Examiner(s): Smith, Jerry
• Assistant Examiner(s): GORDON, PAUL P
• Application Number:
  US07/345,105
• Time in Patent Office: 844 Days
• Field of Search: 382/22, 382/49, 382/16, 382/20, 382/21, 364/191, 364/516, 364/521, 364/518, 364/520, 358/180, 358/209, 358/183
• US Class Current: 700/86
• CPC Class Codes: G05B 19/4207 in which a model is traced or scanned and corresponding data recorded
• CPC Class Codes: G06T 9/20 Contour coding, e.g. using detection of edges
• CPC Class Codes: G06V 10/46 Descriptors for shape, contour or point-related descriptors, e.g. scale invariant feature transform [SIFT] or bags of words [BoW]; Salient regional features colour feature extraction G06V10/56

Abstract

Two dimensional generating system for the geometry of a model using artificial vision, that consists of a matrix camera situated in front of a model that matrixes the image and by a process of binarization converts it into white and black, it is later treated by a microprocessor that interacts with the user for the extraction of the perimeter of the image by analysis of transitions of the data coming from the binarization, and the modelization of the perimeter by determining its lines and curves, and the definition and delimiting of its lines and curves, storing the contents in a memory with a DXF format.

Claims

1. A system for generating a two dimensional image of the geometry of a model using artificial vision comprising:

(a) a matrix camera which matrixes the model image and which has means for sending an analog video signal;

(b) an image acquisition card connected to the system by a connection bus which is adapted to receive the analog video signal from the matrix camera and which comprises;

(i) an analog/digital converter which converts the video signal;

(ii) a black-white binarization circuit which receives the converted video signal;

(iii) an image storage memory which is in communication with the binarization circuit;

(c) a microprocessor;

(d) a keyboard connected to the microprocessor;

(e) a work memory for the microprocessor;

(f) a system storage memory comprising;

(i) perimeter extraction program means for the extraction of the perimeter of the image by analysis of the data coming from the black-white binarization circuit;

(ii) perimeter modelization program means for the modelization of the perimeter by determining the lines and curves of the perimeter by assigning a maximum length to a perimeter segment being analyzed and;

(A) if the length of the measured segment is less than the predetermined maximum length, a comparison is made between the segment being currently measured with the segment previously measured by comparing a predetermined number of points in each segment by a chain code and if the conditions of the chain code are the same for each segment, there is no transition in direction, while if the conditions of the chain code are not the same, there is a transition in direction;

(B) if more than a predetermined number of segments situated along the perimeter in a continuous manner have less than a predetermined length, the segments form a curve; and

(iii) line definition means for the definition of the curve wherein the points of the segments of the curve are compared with the value of a curve program and determination is made that if there is an adjustable difference in the curves being compared, the segments are defined as a particular type of curve, and that if there is not an adjustable difference in the curves being compared, the segments are not defined as a curve but as straight segments; and

(g) a storage memory with a DXF format for storing the generated geometry of the model.

2. The system of claim 1 wherein the analog/digital converter converts the intensities of light transmitted by the analog video signal into discrete tones of light and the binarization circuit is adapted to turn a grey level digitalized image into a binarized black-white image once the binarized threshold is fixed at a predetermined level.

3. The system of claim 1 wherein the predetermined values are introduced into the system by means of the keyboard.

4. The system of claim 1 further comprising a monitor connected to the image acquisition card, the monitor being adapted to display the matrixed image.

5. The system of claim 1 further comprising an interface for communication between the system and a peripheral.