Psuedo-color display for enhanced visual target detection
First Claim
1. Apparatus for display of input image data employing pseudo-color remapping to enhance image interpretation, comprising:
- a color display apparatus responsive to red, green and blue intensity control signals;
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 intensity control signals in accordance with respective nonlinear red, blue and green intensity functions dependent on a single threshold value, and wherein said means responsive to the input image data remaps the input intensity data values x into corresponding output intensity values y in accordance with the following relationships;
for values of x greater than zero but less than the threshold value T
space="preserve" listing-type="equation">y.sub.blue =0
space="preserve" listing-type="equation">y.sub.green =x
space="preserve" listing-type="equation">y.sub.red =-((x-T)(-T).sup.2M-1).sup.(1/2M) +T,and for values of x greater than or equal to the threshold value T
space="preserve" listing-type="equation">y.sub.blue =S((x-T)/(S-T))
space="preserve" listing-type="equation">y.sub.green =((x-T)(S-T).sup.2M-1).sup.1/(2M) +T
space="preserve" listing-type="equation">y.sub.red =((x-T)(S-T).sup.2M-1).sup.1/(2M) +Twhere S represents the maximum saturation intensity value and M is related to the order of the polynomial function defining remapping functions;
said color display apparatus responsive to said red, green and blue display control signals to display the image in pseudo-color.
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Abstract
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.
29 Citations
19 Claims
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1. Apparatus for display of input image data employing pseudo-color remapping to enhance image interpretation, comprising:
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a color display apparatus responsive to red, green and blue intensity control signals; 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 intensity control signals in accordance with respective nonlinear red, blue and green intensity functions dependent on a single threshold value, and wherein said means responsive to the input image data remaps the input intensity data values x into corresponding output intensity values y in accordance with the following relationships; for values of x greater than zero but less than the threshold value T
space="preserve" listing-type="equation">y.sub.blue =0
space="preserve" listing-type="equation">y.sub.green =x
space="preserve" listing-type="equation">y.sub.red =-((x-T)(-T).sup.2M-1).sup.(1/2M) +T,and for values of x greater than or equal to the threshold value T
space="preserve" listing-type="equation">y.sub.blue =S((x-T)/(S-T))
space="preserve" listing-type="equation">y.sub.green =((x-T)(S-T).sup.2M-1).sup.1/(2M) +T
space="preserve" listing-type="equation">y.sub.red =((x-T)(S-T).sup.2M-1).sup.1/(2M) +Twhere S represents the maximum saturation intensity value and M is related to the order of the polynomial function defining remapping functions; said color display apparatus responsive to said red, green and blue display control signals to display the image in pseudo-color. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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12. The apparatus of claim 11 wherein the image data comprises log-detected synthetic aperture radar data.
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13. A method for displaying input image data on color display apparatus responsive to red, green and blue intensity control signals, employing pseudo-color remapping to enhance image interpretation, comprising the steps of:
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remapping the respective input data for each pixel comprising the input image into respective red, blue and green intensity control signals in accordance with respective nonlinear red, blue and green intensity functions dependent on a single threshold value, wherein said remapping step comprises remapping the input intensity data values x into corresponding output intensity values y in accordance with the following relationships; for values of x greater than zero but less than the threshold value T
space="preserve" listing-type="equation">y.sub.blue =0
space="preserve" listing-type="equation">y.sub.green =x
space="preserve" listing-type="equation">y.sub.red =-((x-T)(-T).sup.2M-1).sup.(1/2M) +T,and for values of x greater than or equal to the the threshold value T
space="preserve" listing-type="equation">y.sub.blue =S((x-T)/(S-T))
space="preserve" listing-type="equation">y.sub.green =((x-T)(S-T).sup.2M-1).sup.1/(2M) +T
space="preserve" listing-type="equation">y.sub.red =((x-T)(S-T).sup.2M-1).sup.1/(2M) +Twhere S represents the maximum saturation intensity value and M is related to the order of the polynomial function defining remapping functions; sending said red, green and blue display control signals to the color display apparatus to display the image in pseudo-color. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification