Systems and methods for detecting defects in coatings utilizing color-based thermal mismatch
First Claim
1. A method of analyzing a thermal image of a coated substrate to determine the presence of defects, the method comprising:
- determining a color of the coated substrate;
determining a maximum temperature range of a coated substrate from a thermal image;
determining a defect temperature range of the coated substrate based on the color and the maximum temperature;
identifying a pixel of interest; and
processing the thermal image by;
a) determining a signal value of the pixel of interest based on;
a temperature of the pixel of interest;
temperatures of pixels in a kernel of pixels surrounding the pixel of interest; and
the color of the coated substrate; and
b) comparing the signal value to a lower temperature threshold and an upper temperature threshold of the defect temperature range, wherein the pixel of interest is a defect location when the signal value of the pixel of interest is greater than or equal to the lower temperature threshold and less than the upper temperature threshold.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of analyzing a thermal image of a coated substrate to determine the presence of defects includes determining a defect temperature range based on a color of the coated substrate and the maximum temperature of the coated substrate in the thermal image. Thereafter, the thermal image is processed by determining a signal value of a pixel of interest based on a temperature of the pixel of interest, temperatures of pixels in a kernel of pixels surrounding the pixel of interest, and the color of the coated substrate. The signal value of the pixel of interest is then compared to the lower temperature threshold of the defect temperature range, wherein the pixel of interest is a defect location when the signal value of the pixel of interest is greater than or equal to the lower temperature threshold.
73 Citations
20 Claims
-
1. A method of analyzing a thermal image of a coated substrate to determine the presence of defects, the method comprising:
-
determining a color of the coated substrate; determining a maximum temperature range of a coated substrate from a thermal image; determining a defect temperature range of the coated substrate based on the color and the maximum temperature; identifying a pixel of interest; and processing the thermal image by; a) determining a signal value of the pixel of interest based on; a temperature of the pixel of interest; temperatures of pixels in a kernel of pixels surrounding the pixel of interest; and the color of the coated substrate; and b) comparing the signal value to a lower temperature threshold and an upper temperature threshold of the defect temperature range, wherein the pixel of interest is a defect location when the signal value of the pixel of interest is greater than or equal to the lower temperature threshold and less than the upper temperature threshold. - View Dependent Claims (2, 3, 4)
-
-
5. A method for detecting defects in a coated substrate comprising:
-
determining a color of the coated substrate; manipulating a temperature of the coated substrate; acquiring a thermal image of the coated substrate; determining a maximum temperature of the coated substrate from the thermal image; determining a defect temperature range based on the color of the coated substrate and the maximum temperature of the coated substrate; and processing the thermal image by; a) determining a signal value of a pixel of interest based on; a temperature of the pixel of interest; temperatures of pixels in a kernel of pixels surrounding the pixel of interest; and the color of the coated substrate; and b) comparing the signal value of the pixel of interest to a lower temperature threshold and an upper temperature threshold of the defect temperature range, wherein the pixel of interest is a defect location when the signal value of the pixel of interest is greater than or equal to the lower temperature threshold and less than the upper temperature threshold. - View Dependent Claims (6, 7, 8, 9, 10, 11)
-
-
12. A defect detection system for detecting a defect in a coated substrate comprising a thermal detector electrically coupled to a controller and at least one temperature manipulation device coupled to the controller, wherein the controller is programmed to:
-
receive an input indicative of a color of the coated substrate; manipulate a temperature of the coated substrate with the temperature manipulation device; acquire a thermal image of the coated substrate with the thermal detector; determine a maximum temperature of the coated substrate from the thermal image; determine a defect temperature range based on the color of the coated substrate and the maximum temperature of the coated substrate; identify a pixel of interest; and process the thermal image by; a) determining a signal value of the pixel of interest based on; a temperature of the pixel of interest; temperatures of pixels in a kernel of pixels surrounding the pixel of interest; and the color of the coated substrate; and b) comparing the signal value of the pixel of interest to a lower temperature threshold and an upper temperature threshold of the defect temperature range, wherein the pixel of interest is a defect location when the signal value of the pixel of interest is greater than or equal to the lower temperature threshold and less than the upper temperature threshold. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
Specification