Geospatial information creating system and geospatial information creating method
First Claim
1. A geospatial information creating system for extracting a footprint of a house from an aerial photograph, comprising a processor for executing a program, a memory for storing data required for executing the program, and a storage unit for storing the aerial photograph, wherein the processor is configured to:
- detect edges of an image based on a characteristic quantity of neighboring pixels in the aerial photograph stored in the storage unit;
extract an orientation of the house by analyzing directions of the detected edges;
generate a polygon of an outline of the house by using linear lines of the extracted orientation of the house;
receive specification of a position by an operator for the house to extract the footprint;
determine a house area by an extent covered by extracted edges by periodically extracting neighboring pixels more similar than a threshold before extraction of the edges; and
change the threshold by decreasing it, and extract again neighboring pixels more similar than the changed threshold in the case where the determined house area does not include the specified position.
2 Assignments
0 Petitions
Accused Products
Abstract
To be precisely extracted a house footprint. There is provided a geospatial information creating system for extracting a footprint of a house from an aerial photograph, comprising a processor for executing a program, a memory for storing data required for executing the program, and a storage unit for storing the aerial photograph. The processor detects edges of an image based on a characteristic quantity of neighboring pixels in the aerial photograph stored in the storage unit; extracts an orientation of the house by analyzing directions of the detected edges; and generates a polygon of an outline of the house by using linear lines of the extracted orientation of the house.
20 Citations
10 Claims
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1. A geospatial information creating system for extracting a footprint of a house from an aerial photograph, comprising a processor for executing a program, a memory for storing data required for executing the program, and a storage unit for storing the aerial photograph, wherein the processor is configured to:
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detect edges of an image based on a characteristic quantity of neighboring pixels in the aerial photograph stored in the storage unit; extract an orientation of the house by analyzing directions of the detected edges; generate a polygon of an outline of the house by using linear lines of the extracted orientation of the house; receive specification of a position by an operator for the house to extract the footprint; determine a house area by an extent covered by extracted edges by periodically extracting neighboring pixels more similar than a threshold before extraction of the edges; and change the threshold by decreasing it, and extract again neighboring pixels more similar than the changed threshold in the case where the determined house area does not include the specified position. - View Dependent Claims (2, 3, 4, 5)
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6. A geospatial information creating method for extracting a footprint of a house from an aerial photograph, the method being carried out by a computer system including a processor for executing a program, a memory for storing data required for executing the program, and a storage unit for storing the aerial photograph, the method comprising:
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detecting edges of an image based on a characteristic quantity of neighboring pixels in the aerial photograph stored in the storage unit; extracting an orientation of the house by analyzing directions of the detected edges; generating a polygon of an outline of the house by using linear lines of the extracted orientation of the house; receiving specification of a position by an operator for the house to extract the footprint; determining a house area by an extent covered by extracted edges by periodically extract neighboring pixels more similar than a threshold before extraction of the edges; and changing the threshold by decreasing it, and extracting again neighboring pixels more similar than the changed threshold in the case where the determined house area does not contain the specified position. - View Dependent Claims (7, 8, 9, 10)
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Specification