Transparency evaluation device, transparency evaluation method and transparency evaluation program

Patent metadata

Field	Value
Publication number	US-9750326-B2
Application number	US-201514955157-A
Country	US
Kind code	B2
Filing date	Dec 1, 2015
Priority date	Jun 7, 2013
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A transparency evaluation device includes a skin index calculation unit that calculates at least one of a luminance component in a captured image obtained by photographing a skin, a color component in the captured image, and an amount of generation of negative factors in which the luminance component or the color component in the captured image changes locally, as a first index, obtains at least one of an intensity distribution of the luminance component and an intensity distribution of the color component in the captured image, and calculates at least one of smoothness of a change in the luminance component and smoothness of a change in the color component as a second index based on the intensity distributions, and a transparency evaluation unit that evaluates transparency of the skin based on an overall index in which the first index and the second index are combined.

First claim

What is claimed is:

1. A transparency evaluation device comprising:
an image input processor that inputs a captured image obtained by photographing a skin of a subject;
a skin index calculation processor that calculates at least one of a representative value of a luminance component in the captured image, a representative value of a color component in the captured image, and an amount of generation of negative factors in which a value of the luminance component or a value of the color component in the captured image changes locally, as a first skin evaluation index, obtains at least one of an intensity distribution of the luminance component and an intensity distribution of the color component in the captured image, and calculates at least one of smoothness of a change in the luminance component and smoothness of a change in the color component as a second skin evaluation index based on the obtained intensity distributions;
an overall index calculation processor that combines a plurality of evaluation indexes including the first skin evaluation index and the second skin evaluation index calculated by the skin index calculation processor with one another to calculate an overall index for transparency of the skin; and
a transparency evaluation processor that evaluates transparency of the skin of the subject based on the overall index calculated by the overall index calculation processor.

2. The transparency evaluation device according to claim 1 ,
wherein the skin index calculation processor partitions the captured image according to the value of the luminance component and the value of the color component using a plurality of contour lines set stepwise with uniform intensity spacings in order to obtain the intensity distribution of the luminance component and the intensity distribution of the color component in the captured image.

3. The transparency evaluation device according to claim 2 ,
wherein the skin index calculation processor obtains respective spacings of the plurality of contour lines adjacent to each other, and calculates the second skin evaluation index based on uniformity of the obtained spacings of the plurality of contour lines.

4. The transparency evaluation device according to claim 2 ,
wherein the skin index calculation processor calculates the second skin evaluation index based on the number of the plurality of contour lines partitioning the captured image.

5. The transparency evaluation device according to claim 1 ,
wherein the skin index calculation processor sets the evaluation region for calculating the second skin evaluation index so that a linear connection from a cheek portion of the face of the subject to an outline portion of the face is made.

6. The transparency evaluation device according to claim 1 ,
wherein the skin index calculation processor calculates an average value of the luminance component in the captured image as a representative value of the luminance component, and calculates an average value of the color component in the captured image as a representative value of the color component.

7. The transparency evaluation device according to claim 1 ,
wherein the skin index calculation processor calculates the number, a total area, or an area proportion of the negative factors detected from the captured image as an amount of generation of the negative factors.

8. The transparency evaluation device according to claim 1 ,
wherein the skin index calculation processor detects a portion in which the value of the luminance component or the value of the color component in the captured image changes locally and that is larger than the negative factors as color unevenness, and calculates an amount of generation of the detected color unevenness as a third skin evaluation index, and
the overall index calculation processor combines a plurality of evaluation indexes further including the third skin evaluation index with one another to calculate the overall index.

9. The transparency evaluation device according to claim 8 ,
wherein the skin index calculation processor calculates a total area, an area proportion, or the number of instances of color unevenness detected from the captured image as an amount of generation of the color unevenness.

10. A transparency evaluation method comprising:
inputting a captured image obtained by photographing a skin of a subject;
calculating at least one of a representative value of a luminance component in the captured image, a representative value of a color component in the captured image, and an amount of generation of negative factors in which a value of the luminance component or a value of the color component in the captured image changes locally, as a first skin evaluation index, obtaining at least one of an intensity distribution of the luminance component and an intensity distribution of the color component in the captured image, and calculating at least one of smoothness of a change in the luminance component and smoothness of a change in the color component as a second skin evaluation index based on the obtained intensity distributions;
combining a plurality of evaluation indexes including the first skin evaluation index and the second skin evaluation index that have been calculated with one another to calculate an overall index for transparency of the skin; and
evaluating transparency of the skin of the subject based on the calculated overall index.

11. A non-transitory computer-readable medium storing a transparency evaluation program for causing a computer to execute the steps of:
acquiring a captured image obtained by photographing a skin of a subject;
calculating at least one of a representative value of a luminance component in the captured image, a representative value of a color component in the captured image, and an amount of generation of negative factors in which a value of the luminance component or a value of the color component in the captured image changes locally, as a first skin evaluation index, obtaining at least one of an intensity distribution of the luminance component and an intensity distribution of the color component in the captured image, and calculating at least one of smoothness of a change in the luminance component and smoothness of a change in the color component as a second skin evaluation index based on the obtained intensity distributions;
combining a plurality of evaluation indexes including the first skin evaluation index and the second skin evaluation index that have been calculated with one another to calculate an overall index for transparency of the skin; and
evaluating transparency of the skin of the subject based on the calculated overall index.

Assignees

• Fujifilm Corp

Inventors

• Yoshida Naoko
• Ohgaru Ikuko

Classifications

• G01N21/57

  Measuring gloss · CPC title

• G01N21/251

  Colorimeters; Construction thereof · CPC title

• G01J2003/467

  Colour computing · CPC title

• A61B2576/00

  Medical imaging apparatus involving image processing or analysis (A61B1/00009, A61B6/52 and A61B8/52 take precedence) · CPC title

• A61B5/743

  Displaying an image simultaneously with additional graphical information, e.g. symbols, charts, function plots · CPC title