Method and inspection apparatus for inspecting an object, in particular a bottle
First Claim
1. In a method of inspecting an object, in particular a bottle, which is irradiated by a radiation that is received and converted into an electrical videosignal which is converted into a digital signal, points of fault in said object being recognised by alterations in intensity between said digital signals from two adjacent image spots the improvement wherein(1) only alterations in intensity which exceed a definite threshold level are recorded as the start of a point of fault and the end of a point of fault;
- (2) for each of said points of fault one or more characteristic quantities are determined;
(3) said characteristic quantities are divided up into different classes corresponding with their magnitudes;
(4) the frequency distribution of the occurrence of said characteristic quantities in the different classes is established by adding; and
(5) said frequency distribution established is correlated with predetermined frequency distributions in order to decide about the quality of said object.
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Accused Products
Abstract
A method of and apparatus for inspecting an object, in particular a bottle, which is irradiated by a radiation that is received and converted into an electrical videosignal which is converted into a digital signal, points of fault in the object being established by alterations in intensity between the digital signals from two adjacent image spots, characterized in that:
(1) only alterations in intensity which exceed a definite threshold level are recorded as the start of a point of fault and the end of a point of fault;
(2) for each of these points of fault certain characteristic quantities such, e.g., as mean relative blackening, maximum relative blackening, width of the point of fault and/or overall extent of the point of fault, are determined;
(3) the characteristic quantities are divided up into different classes corresponding with their magnitudes;
(4) the frequency distribution of the occurrence of the characteristic quantities in the different classes is established by adding; and
(5) the frequency distribution established is correlated with predetermined frequency distributions in order to decide about the quality of the object.
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Citations
13 Claims
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1. In a method of inspecting an object, in particular a bottle, which is irradiated by a radiation that is received and converted into an electrical videosignal which is converted into a digital signal, points of fault in said object being recognised by alterations in intensity between said digital signals from two adjacent image spots the improvement wherein
(1) only alterations in intensity which exceed a definite threshold level are recorded as the start of a point of fault and the end of a point of fault; -
(2) for each of said points of fault one or more characteristic quantities are determined; (3) said characteristic quantities are divided up into different classes corresponding with their magnitudes; (4) the frequency distribution of the occurrence of said characteristic quantities in the different classes is established by adding; and (5) said frequency distribution established is correlated with predetermined frequency distributions in order to decide about the quality of said object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. In a method for inspecting an object such as a bottle by detecting radiation directed at the object, converting the detected radiation into an electrical signal representative of image spots from the object, and sensing alterations in the intensity of the signal from two adjacent image spots, the improvement comprising the steps of:
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recording alterations in the intensity of the signal which exceed a predetermined threshold level to define the start of a point of fault and the end of a point of fault; deriving from the alterations one or more characteristic quantities for each of the defined points of fault; sorting each of the one or more characteristic quantities into a plurality of different classes depending upon their magnitudes; counting the frequency of occurrence of each class of each of the one or more characteristic quantities; and correlating the counted frequencies of occurrence with established values to evaluate the quality of the object. - View Dependent Claims (13)
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Specification