Method for generating gray scale transfer functions for use in displaying a digital radiogram

Claim 5

The method according to claim 1 wherein the parameters “b” and “c” are varied to produce a family of LUTs representing a family of GST curves having desired different contrast and brightness.

Claim 6

The method according to claim 2 wherein the input digital values for the X axis are normalized input digital values.

Claim 7

The method according to claim 4 wherein the output digital values from the Y axis are also normalized output digital values.

Claim 8

A program embodied in a machine readable medium for programming a control computer to generate on demand a gray scale transfer (GST) curve for use in deriving a Look-Up-Table (LUT) for displaying an image comprised of a plurality of digital values representing pixel densities with a desired contrast and brightness, using a single sigmoid function Y=f(X, a, b, c) wherein Y represents output values used in displaying an image, X represents input digital values representing captured image information, b=inv 1n (X max contrast *c) and is a first parameter controlling the location of the curve along the X axis, “c” is between 0.01% to 0.2% of X max value and is a second parameter controlling the curve slope and a=Y u *(1+b*e −cXu ) and wherein X u and Y u represent input and output digital data boundary conditions.

Claim 9

A program embodied in a machine readable medium for programming a control computer to generate on demand a gray scale transfer (GST) curve for use in deriving a Look-Up-Table (LUT) for displaying an image comprised of a plurality of digital values representing pixel densities with a desired contrast and brightness, using a single sigmoid function Y=f(X, a, b, c) wherein Y represents output values used in displaying an image, X represents input digital values representing captured image information, b=inv 1n (X max contrast *c) and is a first parameter controlling the location of the curve along the X axis, “c” is between 0.01% to 0.2% of X max value and is a second parameter controlling the curve slope and a=Y u *(1+b*e −cXu ) and wherein X u and Y u represent input and output digital data boundary conditions.

Claim 10

A program embodied in a machine readable medium for programming a control computer to generate on demand a gray scale transfer (GST) curve for use in deriving a Look-Up-Table (LUT) for displaying an image comprised of a plurality of digital values representing pixel densities with a desired contrast and brightness, using a single sigmoid function Y=f(X, a, b, c) wherein Y represents output values used in displaying an image, X represents input digital values representing captured image information, “b” is a first parameter controlling the location of the curve along the X axis, “c” is a second parameter controlling the curve slope and “a” is a number representing boundary conditions, wherein the function Y=f(X, a, b, c) is: Y=a/(1+b*e −cX ) where b=inv 1n (X max contrast *c); “c” is between 0.01% to 0.2% of X max value and: a=Y u *(1+b*e −cXu ).

Claim 11

A program embodied in a machine readable medium for programming a control computer to generate on demand a gray scale transfer (GST) curve for use in deriving a Look-Up-Table (LUT) for displaying an image comprised of a plurality of digital values representing pixel densities with a desired contrast and brightness, using a single sigmoid function Y=f(X, a, b, c) wherein Y represents output values used in displaying an image, X represents input digital values representing captured image information, “b” is a first parameter controlling the location of the curve along the X axis, “c” is a second parameter controlling the curve slope and “a” is a number representing boundary conditions, wherein the function Y=f(X, a, b, c) is: Y=a/(1+b*e −cX ) where b=inv 1n (X max contrast *c); “c” is between 0.01% to 0.2% of X max value and: a=Y u *(1+b*e −cXu ).

Claim 12

The computer program according to claim 7 wherein the output values are digital output values representing a radiogram.

Claim 15

A program embodied in a machine readable medium for programming a control computer to generate on demand a gray scale transfer (GST) curve for use in deriving a Look-Up-Table (LUT) for modifying a plurality of digital image values representing pixel densities with a first contrast and brightness to modified digital values having desired contrast and brightness, wherein said Look-Up-Table (LUT) is derived by generating on demand a gray scale transfer (GST) curve using a single sigmoid function Y=a/(1+b*e −cX ), and wherein Y represents output values used in displaying said image, X represents input digital values representing captured image information, b=inv 1n (X max contrast *c) and is a first parameter controlling the location of the curve along the X axis, “c” is between 0.01% to 0.2% of X max value and is a second parameter controlling the curve slope, and a=Y u *(1+b*e −cXu ) wherein X u and Y u represent input and output digital image data boundary conditions; and wherein the program further comprises modifying said plurality of input digital image values using said derived LUT and using said modified digital image values to display an image having a desired contrast and brightness.

Claim 16

A program embodied in a machine readable medium for programming a control computer to generate on demand a gray scale transfer (GST) curve for use in deriving a Look-Up-Table (LUT) for modifying a plurality of digital image values representing pixel densities with a first contrast and brightness to modified digital values having desired contrast and brightness, wherein said Look-Up-Table (LUT) is derived by generating on demand a gray scale transfer (GST) curve using a single sigmoid function Y=a/(1+b*e −cX ), and wherein Y represents output values used in displaying said image, X represents input digital values representing captured image information, b=inv 1n (X max contrast *c) and is a first parameter controlling the location of the curve along the X axis, “c” is between 0.01% to 0.2% of X max value and is a second parameter controlling the curve slope, and a=Y u *(1+b*e −cXu ) wherein X u and Y u represent input and output digital image data boundary conditions; and wherein the program further comprises modifying said plurality of input digital image values using said derived LUT and using said modified digital image values to display an image having a desired contrast and brightness.