Method for precompensation of digital images for enhanced presentation on digital displays with limited capabilities
First Claim
1. A method of displaying an image on a display device which has known characteristics and is operated in a controlled fashion, comprising the steps of:
- providing a digital image signal of a visual image having a luminance dynamic range DR image for display on an electronic display device having a luminance dynamic range DR display, where DR image is greater than DR display;
determining a low frequency component signal of said digital image signal;
determining a high frequency component signal of said digital image signal;
producing an attenuated low frequency component signal of said digital image from said low frequency component signal by means of a low boost parameter which is a function of DR image and DR display;
producing an amplified high frequency component signal of said digital image signal from said high frequency component signal by means of a high boost parameter which is a function of said low boost parameter; and
combining said attenuated low frequency component signal and said amplified high frequency signal to produce a precompensated image signal which has improved luminance dynamic range and spatial frequency characteristics when the image is presented for display on said display device in a high ambient light environment.
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Abstract
A method of processing a digital image (medical, radiograph) in order to enhance viewing of the image when it is presented for display on a display device (video monitor). An original medical image is digitized and precompensation applied to the digital values to optimize the information content and detail at a CRT, for example. The luminance dynamic range and the spatial frequency content of the original image are reduced to present the most usable image on a display device. The characteristics of the human visual system and the ambient light incident on a calibrated display are factors in the final precompensation of the image.
130 Citations
26 Claims
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1. A method of displaying an image on a display device which has known characteristics and is operated in a controlled fashion, comprising the steps of:
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providing a digital image signal of a visual image having a luminance dynamic range DR image for display on an electronic display device having a luminance dynamic range DR display, where DR image is greater than DR display; determining a low frequency component signal of said digital image signal; determining a high frequency component signal of said digital image signal; producing an attenuated low frequency component signal of said digital image from said low frequency component signal by means of a low boost parameter which is a function of DR image and DR display; producing an amplified high frequency component signal of said digital image signal from said high frequency component signal by means of a high boost parameter which is a function of said low boost parameter; and combining said attenuated low frequency component signal and said amplified high frequency signal to produce a precompensated image signal which has improved luminance dynamic range and spatial frequency characteristics when the image is presented for display on said display device in a high ambient light environment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of displaying an image on a display device which has known characteristics and is operated in a controlled fashion, comprising the steps of:
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providing a digital image signal having luminance dynamic range and spatial frequency characteristics which are degraded when visually displayed on the display device; determining a high frequency component signal of said digital image signal; producing a scaled high frequency component signal of said digital image signal from said high frequency component signal; combining said scaled high frequency component signal and said digital image signal; and producing an attenuated signal of said combined digital image by proportionally reducing said combined digital image to produce a precompensated image signal which has improved luminance dynamic range and spatial frequency characteristics when the image is presented for display on a display device. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification