JPH04366931A - Image forming method - Google Patents

Abstract

PURPOSE:To easily and faithfully reproduce plaster on which the trace of a foot is taken as a photographic image by using a process camera by radiating light so that the irradiation angles and the irradiation distances of two light sources facing to the plaster on which the trace of the foot is provided may be different and photographing the trace of the foot on a photographic sensitive material. CONSTITUTION:The light source A is set at an angle of about 30 deg. and at a distance of 80cm so that the trace of the foot on the plaster 3 may be irradiated with the light, and the light source B is set at an angle of about 50 deg. and at a distance of about 45cm so that an optical axis may be directly cast to the plaster 3, then irradiation is executed by both light sources A and B. When it is assumed that the light projected from the boxes of the light sources A and B is the parallel rays of light, relation between the light and the plaster 3 is shown by a broken line in figure, but actually much scattered light is included. By performing development after photographing, the silver image of the trace of the foot is faithfully and clearly reproduced on a positive material. The angle and the distance of the light sources A and B are different in accordance with the height of the plaster 3 and the height of the three-dimensional image of the trace of the foot, but they are comparatively easily found by performing a few tests.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to an image forming method,
In particular, it relates to a method of photographing a three-dimensional image, such as a footprint made of plaster, using a photosensitive material and reproducing it as a photographic image.

0002

2. Description of the Related Art Obtaining footprints left by a criminal at a crime scene is an important means indispensable for criminal investigations. Footprints of criminals are generally divided into two types: those left on tatami mats, floors, and other hard surfaces, and those left on soft surfaces.
For the former, an adhesive sheet for detecting foot prints is used, and for the latter, it is well known that plaster is poured onto the foot print and allowed to harden.

[0003] Footprints taken using plaster were then
Photographs are taken with a regular camera, printed on black and white photographic paper, and saved. Of course, in order to take pictures with a regular camera, the footprints must be colored. However, there is a problem in that it is not possible to color foot prints left on snow, for example, while maintaining the faithful foot prints, and the method of coloring after taking the foot prints cannot faithfully reproduce them. Ta. In other words, even if we take footprints from the white plaster,
There has been no way to reproduce and preserve this three-dimensional image, which has virtually no contrast between brightness and darkness, as a photographic image.

0004

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an image forming method for reproducing an object such as plaster having white footprints as a photographic image.

Another object of the present invention is to provide an image forming method for reproducing a stereoscopic image as a photographic image in a simple manner using an existing plate-making camera.

[0006]

[Means for Solving the Problems] The above-mentioned object of the present invention is to place an object having a three-dimensional image on the document table of a camera, which is equipped with at least a document table, a light source for illuminating the document, and a photographing section. Light source A and light source B are irradiated from diagonally above facing each other, and when photographing with a photographic light-sensitive material in the photographing section, light source A and light source B are irradiated at different angles and distances to the object to produce the above-mentioned three-dimensional image. This was achieved by an image forming method characterized by photographing an image using a photographic material and developing it.

[0007] The details of the present invention will be explained below with reference to drawings of embodiments.

[0008]

【Example】

Embodiment FIG. 2 is a front view showing a typical example of a plate-making camera suitable for carrying out the present invention.
There are 6S, 5025V, 6026V, 6026S, etc. FIG. 1 is a schematic cross-sectional view of essential parts showing an embodiment of the present invention.

[0010] The original table (original shelf) 1 is of a normal type in which original paper is pressed against a glass plate. Light source A and light source B are box-shaped, each containing two 400 W halogen lamps, for example, and the angle and distance of this box relative to the document table can be adjusted. The light irradiated onto the original is made to hit the photosensitive material in the photographing section 2 through the lens. Examples of photographic light-sensitive materials include, for example, a negative material for silver complex diffusion transfer that provides high-contrast images (manufactured by Mitsubishi Paper Industries, Ltd., One Step B-NE
) is used.

[0011] Gypsum 3 from which footprints left on the snow were collected (
For example, a document 30 cm long, 15 cm wide, and 27 mm high, having a three-dimensional footprint image of about 1 to 3 mm in height on its surface, is placed on the document table 1. The plaster 3 was irradiated with light source A and light source B at the same angle (approximately 45 degrees) and distance (approximately 80 cm), and photographed using a negative material. This negative material and a positive material (manufactured by Mitsubishi Paper Industries, Ltd., One Step IPGL) were developed through a normal DTR processor, and peeled off after about 30 seconds to 60 seconds. The positive material was almost pure white with only a few footprints partially visible as a silver image.

Next, as shown in FIG.
Set to illuminate the footprints on plaster 3 at an angle of 0 degrees and a distance of approximately 80 cm, set light source B at an angle of approximately 50 degrees and a distance of approximately 45 cm so that the optical axis does not directly hit plaster 3, and irradiate with both light sources. did. In Figure 1, the relationship with plaster 3 is shown by a broken line when the light emitted from the boxes of light sources A and B is assumed to be parallel rays, but it should be noted that in reality, a lot of scattered light is included. Not even. After photographing, the image was developed in the same manner as above, and the silver image of the footprint was faithfully and clearly reproduced on the positive material.

The angle and distance between light source A and light source B vary depending on the height of the plaster 3 and the height of the three-dimensional footprint image, and need to be adjusted with a delicate balance. You can find it relatively easily by testing.

As the photosensitive material used in the present invention, ordinary black and white silver halide photographic paper can be used, but silver with high contrast (gradation) is used to reproduce foot prints with virtually no contrast between light and dark. It is preferable to use a photosensitive material for complex salt diffusion transfer.

[0015]

[Effects of the Invention] According to the present invention, uncolored foot prints can be easily and faithfully reproduced as a photographic image using a plate-making camera, which greatly contributes to the promotion of criminal investigations.

[Brief explanation of the drawing]

[Fig. 1] A schematic cross-sectional view of main parts showing a state in which plaster 3 having foot marks according to the present invention is photographed with a plate-making camera.

[Figure 2] Front view of a plate-making camera suitable for use in the present invention

[Explanation of symbols]

1 Manuscript table 2 Photography department 3. Plaster of footprints

Claims (1)

[Claims] Claim 1: An object having a three-dimensional image is placed on the document table of a camera, which is equipped with at least a document table, a light source for illuminating the document, and a photographing section, and light source A and light source B are projected diagonally from above, facing each other. When photographing with the photographic light-sensitive material in the photographing department, the light source A and light source B are irradiated at different angles and distances to the object, and the above three-dimensional image is photographed with the photographic light-sensitive material and developed. An image forming method characterized by: