SYSTEM AND METHOD OF DETERMINING MATERIAL REACTION OR SENSITIVITY USING HIGH-SPEED VIDEO FRAMES

• US 20140153772A1
• Filed: 11/30/2012
• Published: 06/05/2014
• Est. Priority Date: 11/30/2012
• Status: Active Grant

• Current Assignee: Safety Management Services, Inc.
• Original Assignee: Safety Management Services, Inc.
• Inventors: Guymon, Clint
• Granted Patent: US 9,202,145 B2
• Time in Patent Office: Days
• US Class Current: 382/103
• CPC Class Codes: G06F 18/2415 based on parametric or probabilistic models, e.g. based on likelihood ratio or false acceptance rate versus a false rejection rate
• CPC Class Codes: G06T 2207/10016 Video; Image sequence
• CPC Class Codes: G06T 2207/30108 Industrial image inspection
• CPC Class Codes: G06T 7/001 using an image reference approach
• CPC Class Codes: G06V 10/10 Image acquisition document image scanning and transmission H04N1/00; control of digital cameras H04N23/60
• CPC Class Codes: G06V 10/764 using classification, e.g. of video objects

Abstract

A system and method for evaluating the sensitivity of energetic substances or materials for transportation, storage, and in-process scenarios are disclosed. The disclosure discusses a system and method that use a high-speed video device, a CPU or computer, sensitivity equipment for testing and assessing the substance or material reaction or explosion sensitivities, such as an electrostatic discharge device or impact assessment device, and software for running a process or set of rules or instructions to be followed for quantifying and determining whether a reaction has occurred or not.

Claims

1. A method for evaluating a reaction event of an energetic material comprising:

capturing a plurality of image frames of a baseline reaction event using an image capturing device, wherein a baseline data set is obtained from the baseline reaction event and wherein the baseline data set does not comprise all information of the energetic material;

storing the plurality of image frames of the baseline reaction event in computer readable memory;

capturing a plurality of image frames of a trial reaction event using an image capturing device, wherein a trial data set is obtained from the trial reaction event and wherein the trial data set comprises information relating to the energetic material;

storing the plurality of image frames of the trial reaction event in computer readable memory;

quantifying the baseline data set and the trial data set, wherein the quantifying process further comprises the following identifiers;

calculating brightness from the plurality of image frames of the baseline reaction event and the trial reaction event;

calculating the buoyancy from the plurality of image frames of the baseline reaction event and the trial reaction event;

calculating the shape from the plurality of image frames of the baseline reaction event and the trial reaction event; and

calculating the uniformity from the plurality of image frames of the baseline reaction event and the trial reaction event;

comparing the quantified trial data set to the quantified baseline data set; and

determining whether a reaction event occurred based on the comparison of the quantified trial data set to the quantified baseline data set.

2. The method of claim 1, wherein the plurality of image frames are captured based on a triggering event that begins a capture session and an expected length of the baseline reaction event and the trial reaction event that ends the capture session, wherein the frames are recorded and identified as frames of interest.

3. The method of claim 2, wherein the triggering event is an image based trigger.

4. The method of claim 2, wherein the frames of interest are analyzed for an indication of a change obtained during the baseline reaction event and the trial reaction event, wherein the frames of interest that indicate a change are separated from the frames of interest where there is no indication of a change and the separated frames are identified as significant frames.

5. The method of claim 4, wherein the method further comprises creating a background map for each of the significant frames, wherein the background map eliminates ambient information from the quantization of the significant frames.

6. The method of claim 5, wherein the background map is created by standardizing all pixels in each of the significant frames to a baseline brightness value to thereby eliminate all visual effects of the ambient surroundings, such that the analysis is focused directly on an analysis site.

7. The method of claim 2, wherein the method further comprises identifying significant frames from among the frames of interest, wherein each of the frames of interest are analyzed for a change in an image property and a frame is identified as a significant frame when there is a change in the image property.

8. The method of claim 7, wherein each of the frames of interest are analyzed and compared to an average brightness and a frame is identified as a significant frame when its brightness is more than 5 standard deviations greater than a mean brightness.

9. The method of claim 7, wherein the method further comprises converting a color image for each of the significant frames identified to a grayscale image, and filtering each of the grayscale images.

10. The method of claim 9, wherein the method further comprises weighting the filter by giving each pixel a grayscale brightness value, wherein the filtering is centered on the brightest part of the grayscale image and then the grayscale brightness value is attenuated as a distance from a center of a brightest point increases.

11. The method of claim 10, wherein the attenuation is non-linear and follows a hyperbolic tangent distribution.

12. The method of claim 7, wherein the method comprises assigning a brightness value to each pixel in each of the significant frames, wherein the brightness value for a given significant frame is the sum of all pixel values in that significant frame normalized by resolution and the number of significant frames identified in the baseline reaction event or the trial reaction event.

13. The method of claim 12, wherein the method further comprises assigning a buoyancy value, wherein buoyancy is calculated from the difference between the average center of mass, based on a grayscale pixel value, and the value of the center of mass for the first of the plurality of image frames.

14. The method of claim 13, wherein uniformity is found from a reshaped pixel matrix where the number of peaks in the reshaped pixel matrix is found, summed and then normalized.

15. The method of claim 14, wherein the method further comprises identifying the shape of each of the significant frames, wherein shape is calculated by weighting each significant frame'"'"'s shape by performing matrix multiplication with the pixel matrix and the weighting matrix minus the product of the brightness and center of mass in the horizontal and vertical directions, and normalizing the resulting value and summing those resulting values over all significant frames.

16. The method of claim 7, wherein the method further comprises calculating a mean baseline value and a baseline standard deviation for each of the identifiers of brightness, buoyancy, shape and uniformity for the baseline reaction event and storing the results in computer readable memory.

17. The method of claim 16, wherein the method further comprises normalizing the identifiers of brightness, buoyancy, shape and uniformity for the trial reaction event and assigning a value to each identifier, wherein normalizing is based on the mean baseline value and the standard deviation for brightness, buoyancy, shape and uniformity of the baseline reaction event.

18. The method of claim 17, wherein normalizing each of the identifiers of brightness, buoyancy, shape and uniformity for the trial reaction event further comprises subtracting the mean baseline values of the baseline identifiers of brightness, buoyancy, shape and uniformity from the values of each of the trial identifiers of brightness, buoyancy, shape and uniformity, and then dividing the result by the baseline standard deviation for that identifier.

19. The method of claim 18, wherein the normalized value of each identifier is combined to yield a single identifying value that reflects a difference between the trial reaction event and the baseline reaction event.

20. The method of claim 19, wherein the identifying value is determined from the summation of the trial identifiers of brightness, buoyancy, shape and uniformity and the identifying value is proportional to the number of standard deviations from the baseline values.

21. The method of claim 20, wherein the method further comprises setting a specified threshold value to determine whether a reaction event falls within predetermined parameters characterizing the reaction event as a go or no-go reaction, such that if the identifying value of the trial identifiers of the reaction event is greater than the specified threshold, the trial is then designated as a go reaction;

and if the identifying value of the trial identifiers of the reaction event is less than the specified threshold, the trial is then designated as a no-go reaction.

22. The method of claim 21, wherein the method comprises calculating Type I error and Type II error for the specified threshold.

23. The method of claim 22, wherein a recursive method is used to calculate the Type I error and Type II error, wherein the distribution of the identifying value of the trial identifiers for the go reactions and the distribution of the identifying value of the trial identifiers for the no-go reactions are located in a continuous probability distribution.

24. The method of claim 23, wherein the value of the Type I error or the Type II error is optimized by changing the threshold value to reflect the appropriate amount of risk obtained by the sensitivity test results.

25. The method of claim 24, wherein the method further comprises:

reclassifying a portion of the reactions identified as go reactions to no-go reactions based on the estimated probabilities of go reactions and no-go reactions at a given identifying value or collection of identifying values, and reclassifying a portion of the reactions identified as no-go reactions to go reactions based on the estimated probabilities of go reactions and no-go reactions at a given identifying value or collection of identifying values;

updating the values for go reactions and no-go reactions;

re-estimating the distribution of go reactions and no-go reactions based on the updated values for go reactions and no-go reactions at each identifying value or collection of identifying values;

re-estimating the proportion of go reactions and no-go reactions at each identifying value or collection of identifying values based on the updated distribution of go reactions and no-go reactions;

wherein this process is recursively completed to convergence.

26. The method of claim 25, wherein the method further comprises:

estimating the proportion of go reactions to no-go reactions at a given identifying value or collection of identifying values from a ratio of the probability of a go reaction to a no-go reaction at a given identifying value or collection of identifying values, wherein the probability of a go reaction is found from the estimated distribution of go reactions and the probability of a no-go reaction is found from the estimated distribution of no-go reactions.

27. The method of claim 22, wherein the method comprises adjusting the threshold to optimize the Type I error and the Type II error to minimize the risk to personnel during operations, storage, and transportation.

28. A method for evaluating a reaction event of an energetic material comprising:

performing a baseline reaction test using one or more sensitivity devices, wherein no energetic material is present during the baseline reaction test;

performing a trial reaction test for the energetic material using one or more sensitivity devices;

capturing a plurality of image frames of the baseline reaction test using an image capturing device, wherein a baseline data set is obtained from the baseline reaction test and wherein the baseline data set does not comprise all information relating to the energetic material;

capturing a plurality of image frames of a trial reaction test using an image capturing device, wherein a trial data set is obtained from the trial reaction test and wherein the trial data set comprises information relating to the energetic material;

quantifying the baseline data set and the trial data set, wherein the quantifying process further comprises;

calculating brightness of the baseline reaction test and the trial reaction test;

calculating the buoyancy of the baseline reaction test and the trial reaction test;

calculating the shape of the baseline reaction test and the trial reaction test; and

calculating the uniformity of the baseline reaction test and the trial reaction test;

comparing the quantified trial data set to the quantified baseline data set; and

determining whether a reaction event occurred based on the comparison of the quantified trial data set to the quantified baseline data set.

29. A system for evaluating a reaction event of an energetic material comprising:

an image capturing device that captures a plurality of image frames of the reaction event;

a storage device coupled to the imaging capturing device for storing the plurality of image frames in memory;

at least one sensitivity testing device for conducting a test on the energetic material; and

a set of instructions that quantify a plurality of reaction event characteristics, wherein the instructions comprise calculating brightness, buoyancy, shape and uniformity of the reaction event.