Change detection system
A change detection system including an image analysis unit that analyzes an image gathered from an image gathering unit, a change detection unit that detects changes in a plurality of images taken over a predetermined time, where the change detection unit modifies the image to indicate areas where a change has occurred.
1. A change detection system including:
an image analysis unit configured to analyze an image gathered from an image gathering unit affixed to an airplane or drone;
a change detection unit configured to detect changes in a plurality of images taken over a predetermined time,
wherein,
the change detection unit separates each image into a plurality of tiles of a predetermined size,
an Otsu binary thresholding is applied to each pixel in each tile,
a vegetation mask having an analog value greater than 0 is assigned to each pixel based on the Otsu binary thresholding with pixels not assigned to vegetation being assigned a value of 0, and
the image analysis unit is configured to perform a pixel by pixel analysis of each pixel with a vegetation mask greater then 0 in each tile and to compare each pixel to a corresponding pixel stored over a predetermined period of time to determine a deviation in each pixel over time, and
the change detection unit modifies the image to indicate areas where a change has occurred.
2. The change detection system of claim 1 , wherein the change detection unit calculates a normalized differential vegetation index for each image gathered.
3. The change detection system of claim 1 , wherein the change detection unit calculates a soil adjusted vegetation index for each image gathered.
4. The change detection system of claim 1 , wherein the change detection unit performs a Gaussian blur to each tile.
5. The change detection system of claim 1 , wherein the change detection unit applies a local statistics method to each tile.
6. The change detection system of claim 1 , wherein each tile is a square.
7. The change detection system of claim 6 , wherein each square is 25 pixels by 25 pixels.
8. A change detection unit including a processor and a memory with a program being executed in the memory, the program performing the steps of:
analyzing an image gathered from an image gathering unit;
separating by the change detection unit each image into a plurality of tiles of a predetermined size,
applying an Otsu binary thresholding to each pixel in each tile,
assigning a vegetation mask having an analog value greater than 0 to each pixel based on the Otsu binary thresholding with pixels not assigned to vegetation being assigned a value of 0, and
performing a pixel by pixel analysis of each pixel with a vegetation mask greater then 0 in each tile and compare each pixel to a corresponding pixel stored over a predetermined period of time to determine a deviation in each pixel over time
wherein the change detection unit modifies the image to indicate areas where a change has occurred.
9. The method of claim 8 , including the step of calculating a normalized differential vegetation index for each image gathered.
10. The method of claim 8 , including the step of calculating a soil adjusted vegetation index for each image gathered.
11. The change detection system of claim 8 , wherein the change detection unit performs a Gaussian blur to each tile.
12. The change detection system of claim 8 , wherein the change detection unit applies a local statistics method to each tile.
13. The change detection system of claim 8 , wherein each tile is a square.
14. The method of claim 13 , wherein each square is 25 pixels by 25 pixels.