Color correcting method and apparatus
First Claim
1. A color correcting method in a system for printing an image of an object on the basis of a color separation value of the image of the object under a given illuminant, the method comprising the steps of:
- converting a color separation value to be supplied to a system for printing an image of an object into an intermediate colorimetric system value of one of a spectral reflectance and a spectral transmittance;
calculating an estimation value of a colorimetric value of the object under a reference illuminant in accordance with the intermediate colorimetric system value and a spectral distribution of the reference illuminant; and
optimizing the color separation value in accordance with the estimation value of the colorimetric value and a colorimetric value of an image of the object under a given illuminant.
1 Assignment
0 Petitions
Accused Products
Abstract
A color correcting unit receives color separation values such as CMY values from an image input unit. Under the control of a control portion, inputs to a first conversion portion constituted by a neural network which has been trained in advance on the basis of the spectral distribution of an arbitrary illuminant are corrected so that outputs from the first conversion portion satisfy the color separation values and a predetermined requirement. The input values to the first conversion portion, which satisfy the predetermined requirement, are sent to an image output unit. The image output unit outputs an image in accordance with these input values.
78 Citations
11 Claims
-
1. A color correcting method in a system for printing an image of an object on the basis of a color separation value of the image of the object under a given illuminant, the method comprising the steps of:
-
converting a color separation value to be supplied to a system for printing an image of an object into an intermediate colorimetric system value of one of a spectral reflectance and a spectral transmittance; calculating an estimation value of a colorimetric value of the object under a reference illuminant in accordance with the intermediate colorimetric system value and a spectral distribution of the reference illuminant; and optimizing the color separation value in accordance with the estimation value of the colorimetric value and a colorimetric value of an image of the object under a given illuminant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A color correcting apparatus comprising:
-
an image input unit for imaging an object under a given illuminant, the object being printed by a given printing device to generate a color separation value; first conversion means, having a first neural network, for converting the color separation value; first conversion means, having a first neural network, for converting the color separation value into an intermediate colorimetric system value being one of a spectral reflectance and a spectral transmittance; means for obtaining an estimation value of the colorimetric value of the object under a reference illuminant in accordance with the intermediate colorimetric system value and a spectral distribution of the reference illuminant; and optimization means for optimizing the color separation value so that at least one of a square error and an average color difference between the estimation value of the colorimetric value and a colorimetric value of an object under the given illuminant becomes minimum. - View Dependent Claims (11)
-
Specification