DE3048373A1 - DEVICE FOR PHOTOGRAPHIC RECORDING AND REPLAYING OF COLORED IMAGES ACCORDING TO THE LENS GRID PRINCIPLE - Google Patents

Description

AGFA-G = EVaERT AG 30a8373

LEVERKUSEN

CAMERA-WERK MUNICH

CW 2476.0 PC / MC 12/22/80

10-hl / pr-bu 024 7C

Device for the photographic recording and reproduction of Color images according to the lenticular principle

The invention relates to a device with the generic features of the preamble of claim 1.

Devices with these generic features are known and used in conventional lenticular photography. Here is by the size of the strip filter in proportion the light intensity of the system is specified for the focal length of the imaging lens. A stop is only possible in one Dimension possible, namely by rectangular area reduction in the direction of the longitudinal extension of the filter strip. In this way, a task of stopping down is achieved, namely reducing the exposure, increasing the However, depth of field only occurs in one dimension. In addition, with this method, the color information is carried microscopic images of the strip filter on the image carrier also reduced in one dimension, which leads to

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an impermissible strain on the resolving power of the photographic layer and thus the appearance of graininess can lead, which ultimately reduces the reliability of the strip filter image.

The invention is therefore based on the object of modifying the device described above so that a variable, les stopping down is possible without affecting the reliability of the Strip filter images related to the effort are noticeably reduced there. This problem is solved in that with a j

Device with the features of the generic part of the claim L according to the invention those listed in its characterizing part Measures are taken. Advantageous refinements of the invention are laid down in the subclaims.

The invention increases the exposure with simple optical means without great structural effort achieved without the achievable optical resolution would be affected or a change in color would occur. In an embodiment of the invention with purely optical or even in conjunction with electronic means of processing can be done without or almost without a reduction redundancy, isotropic masking independent of the direction of the beam path can be achieved.

The invention is explained with reference to the drawings. In the drawings show:

Figure 1: the principle of the optical recording system in conventional Lenticular photographs,

FIG. 2: the principle of the optical reproduction system, FIG. 3: an exemplary embodiment of the invention.

ORIGINAL JNSPS

♦ *

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In the principle of an optical recording system shown schematically in FIG. 1 in the conventional lens grid photography, a simple color filter strip triple 2 is arranged in the pupil of the imaging lens 1. The size of the strip filter 2 determines the light intensity of the recording system in relation to the focal length of the lens 1. On the surface of the film 3 with the photographic layer there is a preferably in the film base Embossed cylinder lens grid 4, in such a way that each cylinder lens of the cylinder lens grid is an image point is assigned and exactly from the image of a strip filter unit is filled in so that the image contains three color separations for each pixel.

Fading down is only possible in the direction of the longitudinal extension of the filter strip by reducing the area in a rectangular manner. In this way, one task of stopping down, namely a reduction in exposure, is achieved, an increase however, the depth of field only occurs in one dimension. In addition, with this method, the color information strip filter bearing microscopic images on the Image carrier also reduced in one dimension, which leads to an inadmissible stress on the resolving power of the photographic layer and thus the appearance of graininess can lead because this ultimately reduces the redundancy of the strip filter image.

The principle of an optical reproduction system shown schematically in FIG. 2 is related to the recording system the components are identical, only in reverse order. With a light source 5 that is located on the film 3 Illuminated image and imaged via a cylindrical lens grid 4 by means of the objective 1.

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According to the teaching of the invention, in the pupil of the object i

ves instead of a simple color filter strip triplet 2;

a plurality of color stripe filters arranged and the j

Imaging geometry of the cylindrical lens grid on the film ^:

dimensioned so that the image of a single strip filter j

is called from this multiplicity precisely and precisely by the:;

Extension of the individual cylinder lenses given area in:

fills the photographic layer. ;

A strip filter / cylinder lens configuration for variable The aperture is shown in FIG. The multiplicity of color stripe filters is indicated by a central color stripe filter unit 2 (zeroth unit) and a further color strip filter unit 2 * (first left strip filter set). An adjustable diaphragm is indicated by a slide element 6, specifically in the setting of the smallest Aperture that is currently assigned to a color stripe filter set is. The cover can be square or rectangular, if necessary also circular *

The central (zeroth) strip filter set 2 is shown in FIG. 3 imaged by an i-th cylinder lens. The first on the left Strip filter set is imaged by the (i + l) th cylinder lens and superimposed on the image of the central strip filter set. The other images that still appear on the side and their superimpositions are not shown for reasons of clarity in the drawing.

With such an arrangement of a plurality of color filter strip triples in the pupil of the imaging lens there is an effect which is the same in all directions Isotropic glare can be achieved with no or almost no reduction in redundancy.

ORIGINAL INSPECTED

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The imaging geometry of the cylindrical lens grid on the As indicated above, film is sized so that the image of a strip filter unit because of said multiplicity precisely the area in the photographic layer given by the expansion of the individual cylinder lens fills out.

If the taking lens is dimmed with the help of a (square) diaphragm so that only the central strip filter unit is depicted on the photographic layer, then one has the same conditions as with the conventional one Lenticular photography with adapted fixed aperture. Enlarged the square aperture is symmetrical to the optical axis so that now light also passes through the neighboring If strip filter units fall, each cylinder lens forms them into the areas to the side of the optical axis of the cylinder lenses adjacent to it on the left and right.

This does not result in any deterioration in the optical image of the object on the photographic layer, but rather only an increase in exposure by superimposing two images of strip filter units per each Pixel. The increase in exposure corresponds to that when the aperture is enlarged.

In the case of recording systems of the simplest type, the following series of diaphragms can be implemented with the exceptions shown above will:

16 - 5.33 - 3.20 - 2.29 - 1.78.

It is obvious that the graduation of the apertures is at the beginning the series is very large. It is therefore recommended, too

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already form a triple filter unit \ at the smallest aperture. A more favorable division is then / if

for example, one starts from f «11: i

11 - 6.60 - 4.71 - 3.67 - 3.00.

An even more even division can be achieved if;

one uses a rectangular aperture instead of a square one and the dimension D / T for one of the sides? allows. This dimensioning results from experience that with a square diaphragm the reduction in the depth of field in the direction of the square diagonal is negligible
is. On the basis of this consideration one arrives at the division:

11 - 7.85 - 4.73 - 3.09 - 2.51.

If you allow more effort, you can realize any aperture setting as you wish, even a circular aperture, if you correct the resulting color errors. For this purpose, the selected aperture position must be exposed on the film by means of a code. When reproduced via a suitable, expedient electronic presentation medium, this code specifies the signal corrections that must be carried out so that the image appears again in the correct colors. Since the corrections correspond to simple color filtering, they can be carried out on the optical copy of the lenticular image. One
Matrixing is generally not required.

ORIGINAL fNSPECTFD

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Claims (7)

AG FA-GEVAERT AG LEVERKUSEN CAMERA-WERK MUNICH CW 2476.0 PC / MC 12/22/80 10-hl / pr-bu 024 7C Claims 1. Device for the photographic recording and reproduction of color images according to the lenticular principle from a strip filter assigned to the object, divided into three color zones blue, green, red stepwise (color filter strip triple or set) and with one on the
Film arranged on the surface facing the objective of the grid of cylindrical lenses running parallel to the strips of the color filter, characterized in that
that instead of a simple color filter strip triple in the pupil of the lens a multiple color filter strip triple is arranged and that the focal length of the cylinder lens grid in cooperation with the object distance filter - cylinder lens is dimensioned so that the area behind each individual cylinder lens is exactly and straight from the image of the central
Strip filter unit is filled. 2. Device according to claim 1, characterized in that
that when the diaphragm, which is, for example, of rectangular design, is opened, the peripheral strip filter units of each cylinder lens are imaged in the region of the adjacent cylinder lens. CW 2476.0 PC / MC - 2 - 3. Apparatus according to claim 1 and 2, characterized in that by the arrangement of a llfachen strip filter grid (33 colored stripes the discrete f-stops: 11 - 7.9 - 4.7 - 3.1 - 2.5 can be realized. 4. Apparatus according to claim 1 to 3, characterized in that when setting up the device for setting any aperture settings - including the circular shape of the aperture - the respective aperture setting can be registered by exposing corresponding features on the film. 5. Apparatus according to claim 4, characterized in that for the registration of the various aperture settings uniquely assigned code features can be imaged on the film, which when the Film can be read out by appropriate means and automatically attached by means of derived control signals effect corresponding color corrections. 6. Apparatus according to claim 5, characterized in that the color correction by means of optical filters or Like. Is controllable. 7. Apparatus according to claim, characterized in that the color correction by means of electrical or electronic Means for influencing the control signals can be controlled. For this purpose 2 sheets of drawings, Figures 1 to 3 ORIGINAL INSPECTED