RU2486403C2 - Image illumination method, image illumination system and machine-readable medium - Google Patents

Image illumination method, image illumination system and machine-readable medium Download PDF

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RU2486403C2
RU2486403C2 RU2011131415/07A RU2011131415A RU2486403C2 RU 2486403 C2 RU2486403 C2 RU 2486403C2 RU 2011131415/07 A RU2011131415/07 A RU 2011131415/07A RU 2011131415 A RU2011131415 A RU 2011131415A RU 2486403 C2 RU2486403 C2 RU 2486403C2
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illuminators
groups
image
group
light
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RU2011131415/07A
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Russian (ru)
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RU2011131415A (en
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Александр Викторович Белокопытов
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Александр Викторович Белокопытов
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Abstract

FIELD: physics.
SUBSTANCE: multiple groups of illuminators, each having at least one illuminator, are provided, wherein illuminators of each group emit visible light in the same predetermined wavelength range, and the wavelength range of illuminators of each of said groups is different from the wavelength ranges of illuminators in the rest of the groups; emission of illuminators of all groups is directed onto an image to be illuminated; intensity of light from illuminators of each group is controlled such that the spectral composition of the resultant illumination matches the spectral composition of illumination for which the image to be illuminated was formed.
EFFECT: wide range of equipment, enabling correct perception of an image based on illumination conditions existing when said image was created.
17 cl, 6 dwg

Description

FIELD OF THE INVENTION

This invention relates to lighting equipment. In particular, the invention relates to a method for illuminating images, a device for implementing this method, and a computer-readable medium. The invention can be used in museum business, as well as in image recognition, for example in forensics.

State of the art

The problem of illuminating paintings is due to the fact that the artist creates a picture in certain lighting conditions, for example, on a clear morning, on a cloudy day, in a forest (see, for example, US patent No. 2615121, publ. 21.10.1952).

When the picture enters the museum, the problem of its illumination arises: what kind of light should it be illuminated with: scattered daylight, special accent lighting lamps? What should be the intensity of the lighting, will the colors fade from the selected lighting method. It is known that, for example, oil paints change their color from exposure to ultraviolet radiation. Infrared radiation also has a bad effect on paints. Therefore, direct sunlight is excluded.

The traditional approach to lighting used in museums, which is reflected in the design of their buildings, is to organize scattered natural daylight in the halls, which falls on the paintings from above. However, for old paintings, ambient light illumination is insufficient in intensity due to the fact that the colors have already darkened. In addition, natural lighting depends on weather conditions - completely different lighting on a bright sunny day and on a cloudy day.

With artificial lighting there are a lot of difficulties. As an example of the difficulties encountered in organizing the coverage of the most valuable works, one can cite the coverage of the famous painting by Leonardo da Vinci “Mona Lisa” in the Louvre (see http://www.illuminator-magazine.ru/article.asp?articleid=725). In the meager description of this development, it is mentioned that it uses 7 LEDs with different wavelengths, it is mentioned that a beam is formed with a certain emission spectrum, and the spectrum changes along the beam cross section (some parts of the picture are highlighted by radiation with a different spectral composition than other parts). The illuminator uses a fiber optic image converter (VOPI), a description of which can be found in the patent of the Russian Federation No. 2144747 (publ. 10.01.1999).

VPI is needed in this illuminator for the spatial separation of high-power LEDs (so as not to overheat) and is a complex fiber-optic design. As a result, this illuminator is unique.

Other illuminants are also known (see, for example, US Pat. Nos. 6,036,334, publ. March 14, 2000, and 6,554,439, publ. April 29, 2003), which allow changing the spectral composition of lighting, including depending on the time of day, weather conditions, and so on. .P.

Disclosure of invention

The purpose of the present invention is to create such a technical solution that would provide an expansion of the arsenal of technical means, and also provide the opportunity for the correct perception (including automatic recognition) of the image, taking into account the lighting conditions that occurred when creating this image.

To achieve this result, in a first aspect of the invention, there is provided a method for illuminating an image, which comprises arranging several groups of illuminators containing at least one illuminator, the illuminators of each group emitting visible light in the same predetermined wavelength range, and the wavelength range of the illuminators in each of these groups differs from the wavelength ranges of the illuminators in all other groups; direct the radiation of illuminators of all groups to the image to be illuminated; adjust the light intensity from the illuminators of each group so that the spectral composition of the resulting lighting corresponds to the spectral composition of the illumination at which the image to be illuminated was created.

A feature of this method is that the direction of the radiation of the illuminators to the image to be illuminated can be achieved by directing the illuminators directly to this image, or using reflectors and (or) diffusers designed to direct the radiation of the illuminators to the image to be illuminated.

Another feature of this method is that you can arrange either three groups of illuminators (red, green and blue), or at least ten groups of illuminators, and in each of these groups all illuminators emit light in the same a predetermined wavelength range, and the wavelength ranges of light from the illuminators of all groups overlap the wavelength range of visible light.

Another feature of this method is that the method may further comprise stages in which the photosensors are arranged in at least the number of groups of illuminators directed away from the image to be illuminated; provide filters, the passband of each of which corresponds to the range of wavelengths of light from the illuminators of each of the groups, and install each of these filters in front of at least one of the photosensors; The light intensity from the illuminators of each group is regulated based on the signals from the photosensors, in front of which a filter with the same passband is installed as the light wavelength range from the illuminators of this group. The number of photosensors may be equal to the number of groups of illuminators.

To achieve the same result, in a second aspect of the invention, there is provided a system for lighting an image, including: a holder; several groups of illuminators installed on the holder, each containing at least one illuminator, the illuminators of each group emitting light directed to the image in the same predetermined wavelength range, and the wavelength range of the illuminators of each of these groups differs from the wavelength ranges of illuminators in all other groups; a control device configured to adjust the light intensity from the illuminators of each group so that the spectral composition of the resulting lighting corresponds to the spectral composition of the lighting at which the image to be illuminated was created.

The peculiarity of this system is that the illuminators can be directed directly to the image to be illuminated, or with the help of additionally contained reflectors and (or) diffusers.

Another feature of this system is that illuminators of different groups can be installed on the holder in rows with alternating illuminators of different groups in the same row, or illuminators of different groups can be installed on the holder in rows of illuminators of the same group with alternating rows of illuminators from different groups.

Another feature of this system is that it further comprises: photosensors of at least the number of groups of illuminators mounted on the holder and directed away from the image to be illuminated; filters, the passband of each of which corresponds to the range of wavelengths of light from the illuminators of each of the groups, each installed in front of at least one of the photosensors; while the control device is configured to adjust the light intensity from the illuminators of each group based on signals from the photosensors in front of which a light filter with the same passband is installed as the light wavelength range from the illuminators of this group.

The number of photosensors may be equal to the number of groups of illuminators.

Finally, another feature of this system is that it can contain three groups of illuminators (red, green and blue), or at least ten groups of illuminators, and in each of these groups all illuminators are designed to emit light in the same predetermined wavelength range, and the wavelength ranges of light from the illuminators of all groups overlap the wavelength range of visible light.

To achieve the same result, a third object of the invention provides a machine-readable medium designed for direct use in the control device of the above system and containing a program under which this control device controls the light intensity from the illuminators of each group so that the spectral composition of the resulting lighting corresponds to the spectral composition of the lighting at which the image to be illuminated was created.

Brief Description of the Drawings

Figure 1 presents a diagram of a system of the present invention.

Figure 2 shows the spectra of daylight in various conditions.

Figures 3-5 show radiation spectra modeled for three different lighting conditions (morning, afternoon, and evening) using the system of the present invention.

Figure 6 shows the emission spectra of 10 illuminators in the visible range.

Detailed Description of Embodiments

The present invention is explained below using exemplary embodiments.

Figure 1 presents a diagram of a system according to this invention. Groups 1 of illuminators 2 are arranged in a row with alternating illuminators of red, green and blue colors (i.e. different groups 1). It will be appreciated by those skilled in the art that there may be several such rows, and also that each row may contain illuminators of only one color, or there may be more than three rows. The illuminators 2 can be any illuminators, but in a preferred embodiment, they are LEDs commercially available in the form of a tape sold in pieces of the desired length.

All illuminators 2 are mounted on the holder 3, for example, in the form of a plate or any other shape. You can use the design described, for example, in the aforementioned US patent No. 6036334, or any other suitable design. Those skilled in the art will understand that groups 1 of illuminators 2 can be located on all sides of the image 4 to be illuminated, or only on some of its sides. The illuminators 2 can be directed to the image 4 directly (as shown by the bold arrow in figure 1) or oriented to the reflector 5, the reflection of which is directed to the image 4 (dashed arrow in figure 1). As a reflector (or several reflectors) 5, you can use both mirrors and scattering screens, for example, such as those used in studio photography.

Reflectors of the same name 2 of all groups 1 (i.e., reflectors 2 of the same color) are connected to the corresponding output of the control device 6. As a control device 6, it can be used as a purely hardware adjustment device (for example, in the form of variable resistors powered by constant voltage) for manual adjustments. However, it is preferable that the control device 6 was made on the basis of a controller, processor or other computing means controlled by the corresponding program. In principle, the control device 6 may be a conventional personal computer, laptop or other computer device. The principle of control using the control device 6 is described below. Photosensors 7, the number of which is at least equal to the number of groups 1, can be connected to the inputs of the control device 6. Photosensors 7 can be larger if, for example, two photosensors 7 are used per group 1. In front of the photosensors 7 corresponding to each group 1 illuminators 2, a light filter 8 is installed having the same passband as the spectral range of illuminators 2 of this group 1.

The principle of operation of the described system is as follows. Illumination of each image can be carried out by one such system, or one system can be used to illuminate several neighboring images. For each image to be illuminated, the lighting conditions under which this image was created are set. It is clear that several images illuminated by one system should have approximately the same conditions for their creation. Specification of specific lighting conditions can be carried out by a person with relevant experience in recognizing lighting conditions.

Figure 2 presents the radiation spectra in various conditions (see Maksimov V.V. Color transformation with changing lighting. - M: Nauka, 1984, p. 39, www.iitp.ru/upload/publications/690/Maximov_book.pdf ) The left graph of figure 2 (reference position I) shows the relative spectral energy distributions of daylight radiation corresponding to the three phases of daylight: A – H — main Fraunhofer absorption lines in the spectrum of the sun, D40 — spectrum of direct sunlight when the sun is low above the horizon, D65 is the spectrum of the total radiation of the sky and the sun in the daytime, D250 is the spectrum of the radiation of a clear spring sky. Note that the letter D denotes standard radiation sources developed by ... (MCO). The right graph of figure 2 (reference position II) shows the light spectra (distribution of the spectral density of irradiation of the horizontal surface) measured in the forests of America: 1 - in the open space in the deciduous forest, 2 - in the pine forest, 3 - in the mixed forest, 4 - under the canopy of a bunk rainforest, 5 - lighting in a coniferous forest at sunset. These graphs clearly show that the spectral composition of the three primary colors of visible light varies significantly depending on the time of day, as well as on the surrounding environment.

Depending on the given lighting conditions, the control device 6 provides suitable voltages to the illuminators 2 of the corresponding groups 1 so that the radiation intensities of these illuminators 2 produce a total spectrum similar in spectral composition to the illumination in which the illuminated image is created.

Figures 3-5 show radiation spectra modeled by the author for three different lighting conditions (morning, day, and evening) and measured using a X-Rite model I1 hand-held spectrophotometer in high resolution mode (3 nm).

Of course, when setting lighting conditions, one can also take into account variations in the spectra given depending on weather conditions, geographical location (latitude), etc.

To take into account the existing external lighting, it is possible to use signals from photosensors 7, which with the help of filters 8 perceive radiation intensities in one or another sub-band of visible light.

Figure 6 shows the emission spectra of ten specific illuminators in the visible range. In this case, the test results of the Betlux BL-L48 series LEDs are shown (see the website www.chipdip.ru). The use of such a large number of groups 1 of illuminators 2 is preferable for some groups of viewers - these are people with sharp color vision, for example, artists. It is also known that many women (up to 50%) have four-color vision.

The use of this invention allows to obtain images illuminated with exactly the light in which they were created. This can be very important when recognizing photographic images, because proper lighting ensures accurate perception of details that might otherwise be lost in other lighting conditions.

Claims (17)

1. The method of lighting the image, which consists in the fact that there are several groups of illuminators, each containing at least one illuminator, the illuminators of each group emit visible light in the same predetermined wavelength range, and the wavelength range of the illuminators of each of these groups differs from the wavelength ranges of illuminators in all other groups, direct the radiation of illuminators of all groups to the image to be illuminated, adjust the light intensity from the illuminators of each group so that The spectral composition of the resulting lighting corresponded to the spectral composition of the lighting, at which the image to be illuminated was created.
2. The method according to claim 1, in which the direction of the radiation of the illuminators on the image to be illuminated is carried out by directing the illuminators directly on this image.
3. The method according to claim 1, in which the direction of the radiation of the illuminators on the image to be illuminated is carried out using reflectors and / or diffusers designed to direct the radiation of the said illuminators on the image to be illuminated.
4. The method according to claim 1, wherein providing a group of red illuminators, a group of green illuminators and a group of blue illuminators.
5. The method according to claim 1, in which at least ten groups of illuminators are arranged and in each of these groups all illuminators emit light in the same predetermined wavelength range, and the light wavelength ranges from the illuminators of all groups cover the length range waves of visible light.
6. The method according to claim 1, additionally containing stages in which the photosensors are located at least in the number of said groups of illuminators, directed from the image to be illuminated, provide filters, the passband of each of which corresponds to the range of wavelengths of light from the illuminators of each of the above groups, and each of these filters is installed in front of at least one of the aforementioned photosensors, the light intensity from the illuminators of each group is regulated based on the signals from the photosensors, Ed filter which is set with the same bandwidth as the range of wavelengths of light from the illuminators of the group.
7. The method according to claim 6, in which the number of photosensors is equal to the number of groups of illuminators.
8. A system for illuminating an image, comprising a holder, several groups of illuminators mounted on the holder, each containing at least one illuminator, the illuminators of each group emitting light directed to the image in the same predetermined wavelength range, and the range the wavelengths of the illuminators of each of these groups differs from the wavelength ranges of the illuminators in all other groups, a control device configured to adjust the light intensity from the illuminator each group so that the spectral composition of the resulting lighting matched the spectral composition of light, at which the image was created, the subject coverage.
9. The system of claim 8, in which the illuminators are directed directly to the image to be illuminated.
10. The system of claim 8, further comprising reflectors and (or) diffusers designed to direct the radiation of said illuminators to the image to be illuminated.
11. The system of claim 8, in which the illuminators of different groups are mounted on the holder in rows with the alternation of illuminators of different groups in the same row.
12. The system of claim 8, in which the illuminators of different groups are mounted on the holder in rows of illuminators of the same group with alternating rows of illuminators from different groups.
13. The system of claim 8, further comprising photosensors of at least the number of groups of illuminators installed on the holder and directed from the image to be illuminated, filters, the passband of each of which corresponds to the range of wavelengths of light from the illuminators of each of these groups, each installed in front of at least one of the aforementioned photosensors, while said control device is configured to adjust the light intensity from the illuminators of each group to Nove signals from the photosensors, which is installed in front of a light filter with the same bandwidth as the range of wavelengths of light from the illuminators of the group.
14. The system according to claim 9, in which the number of photosensors is equal to the number of groups of illuminators.
15. The system of claim 8, containing a group of red illuminators, a group of green illuminators and a group of blue illuminators.
16. The system of claim 8, containing at least ten groups of illuminators, wherein in each of these groups all illuminators are designed to emit light in the same predetermined wavelength range, and the light wavelength ranges from the illuminators of all groups span the range wavelengths of visible light.
17. A machine-readable medium intended for direct use in the control device of the system of claim 8 and containing a program under the control of which the control device controls the light intensity from the illuminators of each group so that the spectral composition of the resulting lighting corresponds to the spectral composition of the lighting at which it was created image to be lit.
RU2011131415/07A 2011-07-28 2011-07-28 Image illumination method, image illumination system and machine-readable medium RU2486403C2 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2190538C2 (en) * 2000-06-16 2002-10-10 Аграновский Алексей Михайлович Artistic article apparatus
US20040052076A1 (en) * 1997-08-26 2004-03-18 Mueller George G. Controlled lighting methods and apparatus
FR2888708A1 (en) * 2005-07-12 2007-01-19 Lcx Leblanc Chromex Sa Light pattern set control device for e.g. shopping center, has controller transmitting signals through local electric network using PLC technology to control operation of lighting-based animations
RU2298294C2 (en) * 2001-06-05 2007-04-27 Риэктрикс Системз, Инк. Interactive video display system
WO2011098940A1 (en) * 2010-02-09 2011-08-18 Koninklijke Philips Electronics N.V. Lighting apparatus for generating a decorative illumination pattern

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040052076A1 (en) * 1997-08-26 2004-03-18 Mueller George G. Controlled lighting methods and apparatus
RU2190538C2 (en) * 2000-06-16 2002-10-10 Аграновский Алексей Михайлович Artistic article apparatus
RU2298294C2 (en) * 2001-06-05 2007-04-27 Риэктрикс Системз, Инк. Interactive video display system
FR2888708A1 (en) * 2005-07-12 2007-01-19 Lcx Leblanc Chromex Sa Light pattern set control device for e.g. shopping center, has controller transmitting signals through local electric network using PLC technology to control operation of lighting-based animations
WO2011098940A1 (en) * 2010-02-09 2011-08-18 Koninklijke Philips Electronics N.V. Lighting apparatus for generating a decorative illumination pattern

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Effective date: 20160729