Integrated approach to brightness and contrast normalization in appearance-based object detection

A method of forming eigenimages for multiresolution, the method comprising:

• sub-sampling a plurality of training images;
• forming training images of coarse resolution in accordance with the sub-sampled images;
• computing coarse eigenimages corresponding to the training images of coarse resolution;
• interpolating the coarse eigenimages for a finer resolution;
• orthonormalizing the interpolated images;
• and
• providing pseudo-eigenimages corresponding to the orthonormalized images for a finer resolution.

A system for brightness and contrast normalization in appearance-based object detection, the system comprising:

• extraction means for extracting a plurality of training images;
• finding means for finding eigenimages corresponding to the training images;
• receiving means for receiving an input image;
• forming means for forming a projection equation responsive to the eigenimages;
• solving means for solving for intensity normalization parameters;
• computing means for computing the projected and normalized images;
• fitting means for computing the error-of-fit of the projected and normalized images;
• thresholding means for thresholding the error-of-fit;
• and
• determining means for determining object positions in accordance with the thresholded error-of-fit.

A system for forming eigenimages for multiresolution, the system comprising:

• sub-sampling means for sub-sampling a plurality of training images;
• training means for forming training images of coarse resolution in accordance with the sub-sampled images;
• eigenimaging means for computing coarse eigenimages corresponding to the training images of coarse resolution;
• interpolating means for interpolating the coarse eigenimages for a finer resolution;
• orthonormalizing means for orthonormalizing the interpolated images;
• and
• pseudo-eigenimaging means for providing pseudo-eigenimages corresponding to the orthonormalized images for a finer resolution.

A program storage device readable by machine, tangibly embodying a program of instructions executable by the machine to perform method steps for brightness and contrast normalization in appearance-based object detection, the method steps comprising:

• extracting a plurality of training images;
• finding eigenimages corresponding to the training images;
• receiving an input image;
• forming a projection equation responsive to the eigenimages;
• solving for intensity normalization parameters;
• computing the projected and normalized images;
• computing the error-of-fit of the projected and normalized images;
• thresholding the error-of-fit;
• and
• determining object positions in accordance with the thresholded error-of-fit.

A program storage device readable by machine, tangibly embodying a program of instructions executable by the machine to perform method steps for forming eigenimages for multiresolution, the method steps comprising:

• sub-sampling a plurality of training images;
• forming training images of coarse resolution in accordance with the sub-sampled images;
• computing coarse eigenimages corresponding to the training images of coarse resolution;
• interpolating the coarse eigenimages for a finer resolution;
• orthonormalizing the interpolated images;
• and
• providing pseudo-eigenimages corresponding to the orthonormalized images for a finer resolution.