Resources Contact Us Home
Automated recognition of characters using optical filtering with maximum uncertainty - minimum variance (MUMV) functions

Image Number 3 for United States Patent #5371808.

A method and apparatus is described for recognition of hand printed characters using maximum uncertainty--minimum variance (MUMV) functions, such as Gabor functions, implemented by optical elements. A set of optical elements having varying optical density corresponding to a set of two-dimensional MUMV functions is generated. A pattern of illumination responsive to the image of the character to be identified is simultaneously transmitted through each of the optical elements implementing the MUMV functions. The amount of light transmitted through each of the elements is measured, providing a transmission coefficient. Such transmission coefficients are used as a set of inputs to a neural network, such that the inputs to the neural network are a set of transmission coefficients resulting from transmission of light corresponding to a character to be identified through a complete set of optical elements implementing a set of two-dimensional MUMV functions. The neural network calculates weighted sums of the transmission coefficients. The neural network may be implemented as a network of resistors connected between input nodes, intermediate nodes, and output nodes. The output node having the highest voltage identifies the character to be identified.

  Recently Added Patents
Transactional consistency scheme
Mass spectrometry method
Image surveillance system and method of detecting whether object is left behind or taken away
Lighting device with device for regulating the illumination according to the luminance of the illumination field and corresponding use
Polyureas made from aminocrotonates and enaminones
Real-time demand prediction in a fast service restaurant environment
Display apparatus
  Randomly Featured Patents
Device for transferring lead frame
Drum with improved emptying feature
Three-wheeled vehicle
Vinylogous porphyrins
Expandable container holder
File sharing method, computer system, and job scheduler
Touch screen device, method, and graphical user interface for determining commands by applying heuristics
Integrally molded vapor vent valve
Method and apparatus for measuring EEPROM threshold voltages in a nonvolatile DRAM memory device
Indicating system for security of spaces in an aircraft