JP2000020680A - Color modification device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have a color of an original image obtained by a photographing of a subject reproduced by a color under a light source at the time of photographing or a color which a person feels is desirable. SOLUTION: This color correction device modifies a color separation value of an original image that can be obtained by photographing a subject to be the color separation value, that can reproduce a color under a photographing light source situation or a color which a person feels is desirable at a color modification part, which selectively uses a conversion system in accordance with the light source situation at the time of photographing. The device consists of a color separation value input part 1 for inputting the color separation value of the original image obtained by photographing the subject, a color modification part 3 for converting the color separation value into an output image color separation value, and a color separation value output part 5 for outputting the output image color separation value concerned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a digital camera,
The present invention relates to a color correction device that corrects a color of a subject photographed by a photographing device such as a video so that the color can be reproduced in a color under a light source condition at the time of photographing or in a color that humans prefer.

[0002]

2. Description of the Related Art One of the methods for expressing colors is a color separation value. These color separation values are generally subtractive YMCK (cyan, magenta, yellow, black) for printing, and additive RGB (red, green, blue) for display.
Is used. By using the color separation values, each color of the original and the object can be reproduced. 2. Description of the Related Art Conventionally, color correction of a captured color image has been performed by converting a color separation value of a subject obtained from an input unit into a color separation value by a linear conversion based on a matrix calculation or a lookup table method. Was. However, these methods have a problem that a large amount of data is required to create a conversion system according to the light source conditions at the time of photographing, or that the overall color balance is easily broken.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to easily output the color of a subject obtained by photographing with a digital camera, video, or the like without deteriorating the overall color balance. An object of the present invention is to provide a color correcting device for reproducing a color under an illuminant condition at the time of shooting on an image or a color that is preferably felt by a human.

[0004]

A first aspect of the present invention is a color correcting apparatus for correcting the color of an image obtained by photographing a subject in accordance with the light source conditions at the time of photographing. An input unit for inputting the color separation value of the original image obtained in the above, a color correction unit configured by a neural network and reproducing a color under light source conditions at the time of shooting from the color separation value of the original image, An output unit for outputting a color separation value reproduced by the correction unit. A second invention is a color correction device that corrects the color of an image obtained by shooting a subject according to the light source conditions at the time of shooting, and the color separation value of an original image obtained by shooting the subject. An input unit for inputting a color correction unit configured by a neural network to reproduce a color that a human would preferably feel under the light source conditions at the time of shooting from the color separation values of the original image, and a color correction unit reproduced by the color correction unit. An output unit for outputting a color separation value.

[0005]

According to the color correcting apparatus of the present invention, the input section inputs the color separation values of the original image obtained by photographing the subject. The color correction unit selectively uses an exchange system in accordance with the characteristics of the light source condition and, based on the input color separation values, determines the color under the light source condition at the time of photographing or the color that humans prefer under the light source condition at the time of shooting. Reproduce. The output unit outputs the color separation reproduced by the color correction unit.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a block diagram showing a main configuration of a color correction apparatus according to the present invention. The color correction device includes a color separation value input unit 1 and a light source. The color correction device performs correction so that the color of an original image obtained by photographing a subject can be reproduced in a color under a light source condition at the time of photographing, or in a color that humans prefer. It comprises a situation input unit 2, a color correction unit 3, a memory unit 4, and a color separation value output unit 5. The color separation value input unit 1 reads a color separation value of an original image. As the color separation value input unit 1, a digital camera, a video camera, or the like can be used. Further, when the color separation values of the original image are stored in the external storage means, they can be read from the storage means.

The light source status input unit 2 reads the light source status at the time of photographing the subject. The color correction unit 3 is configured by a plurality of neural networks, selects an optimal conversion system by inputting a light source condition at the time of subject photographing from the light source condition input unit 2, and receives an input from the color separation value input unit 1. Color separation values of the original image
Alternatively, a correction is made so that the color can be reproduced in a color that humans prefer. The memory unit 4 stores the parameters of the neural network used in the color correction unit 3, and the parameters are read out and used at the time of color correction. The color separation value output section 5 outputs the color separation value corrected by the color correction section 3. As the color separation value output unit 5, a color printer or the like can be used.

The color correction apparatus needs to learn a neural network for converting an input color separation value into an output image color separation value corresponding to the color separation value. The procedure of the processing will be described with reference to the flowchart of FIG. First, as a process A1 before learning, a color sample having a known color separation value for photographing an output image in a color under a light source condition or a color that a human perceives to be preferable is taken and the color separation value of an original image is taken. Get. In the next process A2, the color separation values of the original image obtained in the above process are input to the neural network, and the color separation values for the output image are input to the neural network as teacher signals, and learning is performed in the next process A3. That is, learning is performed so as to minimize the square error between the output of the network and the teacher signal. The above processing is completed (processing A4),
After the neural network has been fully trained,
In process A5, the structure and weight of the network are stored in the memory 4, and the construction of the conversion system ends. A plurality of conversion systems are constructed by performing a series of learning processes using the color separation values for each light source condition at the time of color sample shooting as input signals.

Next, the operation procedure of the color correcting apparatus will be further described with reference to the flowchart of FIG. First, a color separation value of an original image obtained by photographing a subject is read from the color separation value input unit 1 (procedure B1). Next, the light source condition at the time of photographing the subject is input from the light source condition input unit 2, and the optimal neural network to be used in the color correction unit 3 is selected (procedure B2). Thereafter, in the color correction unit 3, the input color separation value is corrected to the output image color separation value by the neural network selected in step B2 (step B3). Finally, the color separation value corrected in step B3 is output by the color separation value output unit 5 (step B4).

[0010]

As described in detail above, according to the present invention,
It is possible to provide a color correction device that corrects a color of an original image obtained by photographing a subject so that the color can be reproduced in a color under the conditions of a photographing light source or in a color that is preferable to humans.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining a configuration of a device of the present invention.

FIG. 2 is a flowchart for explaining a processing procedure for constructing a conversion system of the apparatus of the present invention.

FIG. 3 is a flowchart for explaining the operation of the apparatus of the present invention at the time of color correction;

[Explanation of symbols]

 1: color separation value input section 2: light source status input section 3: color correction section 4: memory section 5: color separation value output section

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 9/73 H04N 1/46 Z F-term (Reference) 5B057 BA02 BA11 CA01 CA08 CA12 CB01 CB08 CB12 CC01 CE17 CH08 DB06 DB09 5C066 AA01 AA05 BA20 CA17 EA13 EC01 FA01 GA01 KD07 KE02 KE03 KE16 KM05 5C077 LL19 MP08 NP01 PP37 PP71 PQ15 TT09 5C079 HB12 JA25 LA02 LA23 LB01 MA13 NA03 NA06

Claims (2)

[Claims] 1. A color correcting apparatus for correcting the color of an image obtained by photographing a subject in accordance with the light source condition at the time of photographing, wherein a color separation value of an original image obtained by photographing the subject is calculated. An input unit for inputting, a color correction unit configured by a neural network to reproduce a color under light source conditions at the time of shooting from the color separation values of the original image, and a color separation value reproduced by the color correction unit. And an output unit for outputting.
A color correction device characterized by the above-mentioned. 2. A color correction device for correcting the color of an image obtained by photographing a subject according to the light source condition at the time of photographing, wherein the color separation value of an original image obtained by photographing the subject is calculated. An input unit for inputting, a color correction unit configured by a neural network, which reproduces a color that is preferably felt by a human under light source conditions at the time of shooting from the color separation values of the original image, and a color reproduced by the color correction unit A color correction device, comprising: an output unit for outputting a separation value.