EP-4740061-A1 - METHOD FOR ADJUSTING COLOR OF AT LEAST ONE ACTIVE LENS OF A SMART SPECTACLE, AND CORRESPONDING OPHTHALMIC SYSTEM

EP4740061A1EP 4740061 A1EP4740061 A1EP 4740061A1EP-4740061-A1

Abstract

The invention provides a method implemented by computer means for adjusting color of at least one active lens of a smart spectacle (1) when used by a wearer, said method comprising: acquiring (100) at least one image representing said wearer and its current environment; determining (110) a first set of N colors, N being an integer greater or equal to 1, said first set of N colors comprising dominant colors in said at least one acquired image; determining (120) a second set of M harmonized colors, M being an integer greater or equal to 1, based on said first set of N colors; selecting (130) at least one harmonized color within said second set of M harmonized color; and controlling (140) said at least one active lens so that an external color of said at least active lens corresponds to the selected at least one harmonized color.

Inventors

LE CAIN, Aurélie
DUBAIL, Marie
PONOT, Solange

Assignees

ESSILOR INTERNATIONAL

Dates

Publication Date: 20260513
Application Date: 20240705

Claims (14)

1 . A method implemented by computer means for adjusting color of at least one active lens (1 1 ) of a smart spectacle (1 ) when used by a wearer, said method comprising: - acquiring (100) at least one image representing said wearer and its current environment; - determining (1 10) a first set of N colors, N being an integer greater or equal to 1 , said first set of N colors comprising dominant colors in said at least one acquired image; - determining (120) a second set of M harmonized colors, M being an integer greater or equal to 1 , based on said first set of N colors; - selecting (130) at least one harmonized color within said second set of M harmonized colors; and - controlling (140) said at least one active lens (1 1 ) so that at least one external color of said at least active lens corresponds to the selected at least one harmonized color, wherein: - if said first set is limited to a unique color, determining (120) said second set of harmonized colors comprises calculating a harmonized color corresponding either to the complementary color of said unique color, or to a monochromatic color with the same hue as for the unique color, but a difference of chroma and luminance, or to an analogous harmony color; - if said first set is limited to a pair of colors, determining (120) said second set of harmonized colors comprises calculating harmonized colors each corresponding either to the complementary color of a respective color of the pair, or to a monochromatic color with the same hue as for the respective color, but a difference of chroma and luminance, or to an analogous harmony color, or to a triadic harmonious color; and - if said first set comprises three or more colors, determining (120) said second set of harmonized colors comprises using color harmonic templates on a hue wheel, such as i type, V type, L type, I type, T type, Y type or X type templates.
2. A method according to claim 1 , wherein acquiring (100) at least one image comprises capturing said at least one image representing said wearer and its current environment.
3. A method according to claim 1 , wherein acquiring (100) at least one image comprises receiving said at least one image representing said wearer and its current environment.
4. A method according to anyone of the preceding claims, wherein determining (1 10) said first set of N colors comprises extracting (1 16) a predetermined number of dominant colors from said at least one acquired image.
5. A method according to claim 4, wherein determining (1 10) said first set of N colors further comprises selecting at least one zone of interest within said at least one acquired image, and wherein said predetermined number of dominant colors is extracted from the at least one selected zone of interest.
6. A method according to anyone of claims 4 or 5, wherein said predetermined number of dominant colors is greater than two and is preferably equal to six.
7. A method according to anyone of claims 4 to 6, further comprising completing the first set of N colors by at least one additional color selected by the wearer.
8. A method according to any of the preceding claims, wherein determining (120) said second set of harmonized colors comprises canceling at least one determined color based on lens constraints.
9. A method according to any of the preceding claims, wherein selecting (130) a harmonized color comprises generating (131 ) a color harmony score between each of the M harmonized colors within said second set and a predetermined color.
10. A method according to claim 9, wherein generating (131 ) a color harmony score comprises applying a color harmony model for two colors, or determining arclength distances on a hue wheel.
1 1. A method according to anyone of claims 9 and 10, wherein selecting (130) at least one harmonized color comprises having (132) the wearer select among a final set of harmonized colors having the highest scores.
12. An ophthalmic system comprising a smart spectacle (1 ) equipped with at least one active lens and means for: - acquiring (100) at least one image representing said wearer and its current environment; - determining (1 10) a first set of N colors, N being an integer greater or equal to 1 , said first set of N colors comprising dominant colors in said at least one acquired image; - determining (120) a second set of M harmonized colors, M being an integer greater or equal to 1 , based on said first set of N colors; - selecting (130) at least one harmonized color within said second set of M harmonized colors; and - controlling (140) said at least one active lens (1 1 ) so that at least one external color of said at least active lens corresponds to the selected at least one harmonized color wherein: - if said first set is limited to a unique color, determining (120) said second set of harmonized colors comprises calculating a harmonized color corresponding either to the complementary color of said unique color, or to a monochromatic color with the same hue as for the unique color, but a difference of chroma and luminance, or to an analogous harmony color; - if said first set is limited to a pair of colors, determining (120) said second set of harmonized colors comprises calculating harmonized colors each corresponding either to the complementary color of a respective color of the pair, or to a monochromatic color with the same hue as for the respective color, but a difference of chroma and luminance, or to an analogous harmony color, or to a triadic harmonious color; and - if said first set comprises three or more colors, determining (120) said second set of harmonized colors comprises using color harmonic templates on a hue wheel, such as i type, V type, L type, I type, T type, Y type or X type templates.
13. An ophthalmic system according to claim 12, wherein said means are fully integrated in said smart spectacle (1 ).
14. An ophthalmic system according to claim 12, wherein: - said smart spectacle (1 ) further comprises wireless communication means (17a-17c); - said ophthalmic system further comprises at least one distinct equipment (2, 3a-3c) designed for communicating with said wireless communication means (17a-17c) according to a least one wireless protocol, said at least one distinct equipment being a server (2), or a smart phone (3a), or a smart watch (3b), or a personal computer (3c), and wherein said at least one wireless protocol is Bluetooth or WiFi or a mobile telecommunications standard; and - said means are distributed between said smart spectacle (1 ) and said at least one distinct equipment (2, 3a-3c).

Description

Method for adjusting color of at least one active lens of a smart spectacle, and corresponding ophthalmic system FIELD OF THE DISCLOSURE The present disclosure relates to a method for adjusting color of at least one active lens of a smart spectacle, and to a corresponding ophthalmic system. BACKGROUND OF THE DISCLOSURE Generally, the choice to purchase ophthalmic devices such as spectacles tends to be based on esthetic and fashion trend. In most of the cases, when a customer wants to buy spectacles, especially sunglasses, the tint of the lenses is generally already defined. Most sunglasses are chosen according to the frame aesthetic (color and design) rather than the solar filter applied. Consequently, most sold sun lenses are grey, brown and grey-green. Colored lenses are chosen in an optical shop, based on the wearer's preference but without any advice or input from his habits. Besides, this choice may turn out to be irrelevant according to the wearer's outfit or environment. For spectacles equipped with passive lenses, the customer needs to have several spectacles if he wants to adapt his look to the environment. More recently, smart spectacles with electrochromic (or active) lenses have been developed which enable an automatic change in the tint of the lenses by applying control signals generated by the frame to activate electrochromic dyes in the lenses. For instance, document WO 2018 153 878 disclose several embodiments to achieve variable color transmissive electrochromic lenses and document US 2018 239 170 discloses solutions for providing reflective EC lens using for instance liquid crystal in Cholesteric phase, having pitch determined according to the wavelength to be filtered (Bragg Reflection). Document EP 3 422 086 discloses the use of electrochromic lenses to adjust the color based on the environment characteristics. However, this document focuses on solutions to propose vision improvement for the user, such as better contrast, better color vision... and does not address an observer point of view and so the aesthetic of the wearer. Therefore, there is an unfulfilled need to help a wearer to select, among a large palette of available colors provided by an electrochromic lens, the color the most relevant for wearer’s appearance, considering both his/her current environment color characteristics, and his/her own color characteristics (such as hair, dress code, make-up, frame color...) SUMMARY OF THE DISCLOSURE To solve this problem, the disclosure provides a method implemented by computer means for adjusting color of at least one active lens of a smart spectacle when used by a wearer according to claim 1 , said method comprising: - acquiring at least one image representing said wearer and its current environment; - determining a first set of N colors, N being an integer greater or equal to 1 , said first set of N colors comprising dominant colors in said at least one acquired image; - determining a second set of M harmonized colors, M being an integer greater or equal to 1 , based on said first set of N colors; - selecting at least one harmonized color within said second set of M harmonized colors; and - controlling said at least one active lens so that at least one external color of said at least active lens corresponds to the selected at least one harmonized color. In some embodiments, acquiring at least one image may comprise capturing said at least one image representing said wearer and its current environment. In other embodiments, acquiring at least one image may comprise receiving said at least one image representing said wearer and its current environment. In some embodiments, determining said first set of N colors may comprise extracting a predetermined number of dominant colors from said at least one acquired image. In such embodiments, determining said first set of N colors may further comprise selecting at least one zone of interest within said at least one acquired image, and said predetermined number of dominant colors is extracted from the at least one selected zone of interest. In such embodiments, said predetermined number of dominant colors is greater than two and is preferably equal to six. In such embodiments, the method may further comprise completing the first set of N colors by at least one additional color selected by the wearer. If said first set is limited to a unique color, determining said second set of harmonized colors comprises calculating a harmonized color corresponding either to the complementary color of said unique color, or to a monochromatic color with the same hue as for the unique color, but a difference of chroma and luminance, or to an analogous harmony color. If said first set is limited to a pair of colors, determining said second set of harmonized colors comprises calculating harmonized colors each corresponding either to the complementary color of a respective color of the pair, or to a monochromatic color with the same hue as for the respective