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Psuedo-color-display-for-enhanced-visual-target-detection

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Psuedo-color display for enhanced visual target detection

Details

Inventors: Haugen, Marc D.; Morelock, Robin L.;
Assignee: Hughes Aircraft Company (Los Angeles, CA)
Primary Examiner: Lobo; Ian J.
Assistant Examiner:
Attorney, Agent or Firm: Alkov; Leonard A., Denson-Low; Wanda K.

A pseudo-color display useful for enhanced target detection of two-dimensional images such as SAR data. The system includes a color display apparatus responsive to red, green and blue display control signals, and apparatus responsive to the input image data for remapping the respective input data for each pixel comprising the input image into respective red, green and blue display control signals in accordance with respective nonlinear red, green and blue remapping functions dependent on a single intensity threshold. This apparatus can include respective look-up tables stored in memory for each color, to be addressed by the respective pixel values. The display in one form also includes an image data processor which analyzes the input image data to adaptively select the intensity threshold, and calculate the respective remapping function values.

DETAILED DESCRIPTION A pseudo-color display apparatus for the display of image data employs pseudo-color remapping to enhance image interpretation.
The apparatus includes a color display apparatus such as a color CRT responsive to red, green and blue display control signals.
In accordance with the invention, the display apparatus comprises means responsive to the input image data for remapping the respective input data for each pixel comprising the input image into respective red, blue and green display control signals in accordance with respective nonlinear red, green and blue remapping functions dependent on a single threshold value.
The color display apparatus is responsive to the red, green and blue display control signals to display the image in pseudo-color.
In the preferred embodiment, the remapping functions and the threshold are selected such that the image background is displayed as green, and targets are displayed in yellow, with corner reflectors and other high intensity returns displayed in white.
The remapping functions are further selected to provide an image display which provides gradual color and intensity transitions.
For certain applications, the display apparatus further comprises an image data processor responsive to the input image data for adaptively selecting the threshold value in dependence on predetermined characteristics of the image.

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