Method and apparatus for producing classifier training images via construction and manipulation of a three-dimensional image model
View Patent ↗A system ( 400 ) for generating training images for a pattern recognition classifier ( 54 ) from three-dimensional image data representing an output class comprises a model constructor ( 404 ) that constructs an image model in a standard coordinate domain from the three-dimensional image data. A model transformer ( 406 ) manipulates the image model in the standard coordinate domain to produce at least one manipulated image model. An image restorer ( 408 ) maps the at least one manipulated image model from the standard coordinate domain to a coordinate domain associated with an image source utilized during the run-time operation of the pattern recognition classifier.
1. An occupant classifier training method for use in vehicle restraining systems comprising the steps of:
at least one processor performing the steps of:
producing an image model in a vehicle coordinate domain; transforming the image model to simulate at least one desired property associated with a vehicle occupant, wherein transforming the image model comprises applying a transformation matrix, comprising a plurality of randomly selected coefficients, to the image model, the plurality of coefficients being selected according to associated probability density functions; mapping the transformed image model to a camera coordinate domain associated with the run-time operation of the classifier; merging data associated with the transformed image model with a desired background image to create a training image; and training a pattern recognition classifier using the training image.
2. The method of claim 1 wherein the step of producing the image model includes:
imaging a subject with a plurality of stereo camera assembles, each comprising at least two cameras, arranged at a plurality of different orientations to acquire base image data from each camera;
mapping at least a portion of the acquired base image data at each stereo camera assembly from a coordinate domain associated with the stereo camera assembly to a vehicle coordinate domain; and
fusing the mapped image data from the plurality of stereo camera assemblies to produce an image model representing the subject.
3. The method of claim 1 wherein the step of training the classifier includes classifying the training image and providing training data associated with the training image to the classifier if the classifier produces an incorrect classification.
4. The method of claim 1 wherein the steps of transforming the image model, mapping the transformed image model to the camera coordinate domain, and training the classifier are repeated iteratively until a termination event occurs.
5. The method of claim 4 , wherein the termination event is the achievement of a desired level of classifier accuracy.
6. The method of claim 1 further comprising extracting feature data from the training image.