JPH06160617A - False color filter - Google Patents

Abstract

PURPOSE:To enable the conversion of the green color of green leaves to a read color system while enabling the observation of an achromatic color as an achromatic color by allowing the strong transmission of the red light in visible light and allowing the very slight transmission of blue light and green light. CONSTITUTION:This false color filter has not only the property to allow the strong transmission of the red light of about >=670nm but also the property to allow the slight transmission of both of the blue light and the green light at about 500nm. Consequently, the entire part of the visual field is merely visible red with the conventional IR filter and an object is visible with only the colors of the range where the red and the but are mixed with the previous dichromatic filter but with this filter, three primary color light rays of B, G, R from 400nm to 700nm are eventually transmitted in average and, therefore, only the green leaves which strongly reflect the red light appear very red while the ordinary object is visible approximately normal. The green of ordinary paint and ink do not, however, make extraordinary reflection and, therefore, the visual effect that this green is visible as ordinary green is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Use The present invention relates to a light transmitting body such as a see-through and photographing filter. An ordinary subject does not significantly change its hue and strongly reflects red end light. The present invention relates to the invention of the light transmissive body that can obtain the false color effect that only the green leaves that appear are reddish abnormally.

(B) Conventional technology Conventionally, there are 1) red end (infrared) filter and 2) dichroic filter that transmits blue light and red light, in which green leaves can be seen red. .

(C) Problems to be Solved by the Invention However, 1) does not allow visible light other than red to pass therethrough, so that the entire field of view is uniformly red. In addition, since 2) is a blue and red dichroic filter, all objects appear only in the range of red, blue, or a mixture of both, and therefore, in the conventional one, It is impossible to obtain the mysterious visual effect that the object of the present invention is that the green leaves are strangely reddish while the objects are seen daily.

(D) Means for solving the problem It is well known that general green leaves have higher infrared reflectance than green light reflectance, but they also contain a considerable amount of visible red light. There is. In other words, green leaves have two peaks of green light and red light in visible light, so if only red end light is transmitted, green light can be cut and green leaves can be converted to red, Only transmitting the end light only makes the whole red uniformly, and the false color effect cannot be obtained. However, if blue light and green light other than red end light are also slightly transmitted, the color of a normal subject does not change much like seeing through an ND filter with high density, but the reflection of red end light is high. If you take a picture with a color film that looks red and the red leaves are exposed to the end of the red, the green leaves develop red, but the light reflected from other objects is also exposed to the green emulsion layer and the blue emulsion layer. Paints, inks, and the like appear in a greenish color, and other colors can obtain a false color effect similar to that of an infrared color film. An embodiment will be described below with reference to the drawings. That is, as shown in FIG. 1, about 670 nm
The red end light above is rapidly and strongly transmitted, and
If a slight transmission band is generated in the vicinity of nm, in this case, the transmission of blue light (500 nm or less), green light (500 nm or more), and red light to the visual sense is balanced, and thus achromatic color is obtained in sunlight. It can be observed as an achromatic color,
Only colors with abnormally strong reflection of red light such as green leaves and black cloth will be noticeably red. FIG. 2 shows about 670.
An example in which the above-mentioned effect is obtained by rapidly and strongly transmitting red end light having a wavelength of nm or more and by transmitting a very small amount of visible light almost uniformly over the entire wavelength range is shown. These can be produced individually,
The same effect may be obtained by stacking two sheets or three sheets. Also, the overall color tone can be adjusted toward blue or green.

(E) Action All of these false color filters are about 670
In addition to having a property of strongly transmitting red end light having a wavelength of not less than nm, the embodiment of FIG. 1 slightly transmits both blue light and green light in the vicinity of 500 nm, and in FIG. Transparent light. As a result, conventional infrared filters simply appear to be red throughout the field of view, while the previous dichroic filters only show the colors of the object in the red and blue mixed range, which is why BGR from 400nm to 700nm
Since the light of the three primary colors is transmitted approximately on average, ordinary objects look almost normal as you would normally see them, but only the green leaves that reflect the red end light abnormally strongly appear red, but Since normal paint or ink green has no abnormal reflection, it is possible to obtain an unprecedented visual effect that it looks like normal green.

(F) Effects of the invention The effects produced by the present invention are
In order to obtain the false color in which green leaves were recorded in red, it was necessary to shoot with a characteristic infrared color film, but with the advent of the filter of the present invention, not only can it be directly observed with the naked eye, but also with a color film, a similar It has a great effect that a false color effect can be obtained.
Further, for fluoroscopy, if this is used as a viewing filter, the photographing effect of infrared color can be predicted and confirmed before photographing. In addition, for forensic purposes, it is possible to identify the distribution state of plants and imitation without infrared imaging. Also, by applying it to glasses etc. as special sunglasses etc., anyone can easily enjoy the false color effect described above, and it can be useful for learning to know the mysterious nature of green leaves and vision as a color teaching material. it can. In addition, by applying it as a building material to light-shielding materials such as window glass of homes and offices and sun visors of automobiles, and plastic products, it brings about the effect of relieving mental tension by a fresh surprise that is far beyond the common sense. , Can be used to relieve stress.

[Brief description of drawings]

The figure is a spectral specific transmittance curve of the false color filter of the present invention, FIG. 1 shows the first embodiment, and FIG. 2 shows the second embodiment. In each case, the horizontal axis represents the wavelength of light (nm) and the vertical axis represents the transmittance (%).

Claims (1)

[Claims] By strongly transmitting red end light in visible light and transmitting very little blue light and green light, it is possible to convert the green color of the green leaf into a red color while observing the achromatic color as an achromatic color. Characteristic light transmissive body.