Method and apparatus for photogrammetric assessment of biological tissue
First Claim
1. A method for remotely determining the normal view shape of a region of biological tissue such as a wound comprising;
- a. positioning a target object having a target plane containing known contrasting visual features and dimensions so as to locate said target plane proximate a plane tangent to a wound,b. forming an optical image of said target object and said wound using an optical imaging system that has an optical axis which may be inclined at an arbitrary oblique angle to a normal to said tangent plane of said wound and said target plane,c. determining a coordinate transformation that maps an oblique image of said target object into normal view thereof,d. mapping by said coordinate transformation said image of said target object into a normal image thereof, ande. mapping by said coordinate transformation said wound image, thereby obtaining a normal image of said wound.
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Accused Products
Abstract
A remote wound assessment method and apparatus includes forming an oblique image of a wound and a target plate containing a rectangle and placed near the wound. Using a novel method of determining vanishing points where photographic images of parallel lines on the target object intersect, coordinate transformations are calculated which map the oblique image of the rectangle into a normal image thereof. Using the same coordinate transformations, an oblique image of a wound adjacent to the target plate is mapped into a normal view thereof, allowing precise measurement of wound features. By forming two separate images of a wound and target plate at two different oblique inclinations, three dimensional features of a wound may be measured.
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Citations
21 Claims
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1. A method for remotely determining the normal view shape of a region of biological tissue such as a wound comprising;
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a. positioning a target object having a target plane containing known contrasting visual features and dimensions so as to locate said target plane proximate a plane tangent to a wound, b. forming an optical image of said target object and said wound using an optical imaging system that has an optical axis which may be inclined at an arbitrary oblique angle to a normal to said tangent plane of said wound and said target plane, c. determining a coordinate transformation that maps an oblique image of said target object into normal view thereof, d. mapping by said coordinate transformation said image of said target object into a normal image thereof, and e. mapping by said coordinate transformation said wound image, thereby obtaining a normal image of said wound. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 19, 20)
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12. A method for optically assessing characteristics of a wound comprising:
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a. positioning a target object comprising a thin sheet having formed thereon optically contrasting fratures proximate a plane tangent to a wound, b. forming an optical image of said target object and said wound using an optical imaging system that has an optical axis which may be inclined at an oblique angle to a normal to said plane tangent to said wound and said target object, c. determining a coordinate transformation that maps an oblique image of said target object into a normal view thereof, d. mapping by said coordinate transformation said image of said target object into a normal image thereof, e. mapping by said coordinate transformation said wound image, thereby obtaining a normal image of said wound, and f. observing features of said normal image of said wound. - View Dependent Claims (13, 14, 15, 21)
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16. An apparatus for remotely assessing characteristics of a wound comprising:
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a. a target object having a plane containing quantifiable visual features for placement proximate a plane tangent to a wound, b. means for forming a composite image including images of said target object and said wound at an arbitrary oblique angle to said wound and said target object, c. means for performing a coordinate transformation that maps an oblique image of said target object into a normal view thereof, and d. means for mapping by said coordinate transformation said image and said wound image of said target object into normal images thereof. - View Dependent Claims (17, 18)
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Specification