GB/T 23865-2009The scaled photography method (English PDF)

2.1

With centimeter scale as the basic unit of measurement, the scale with the same subject photographed recorded, according to a scale to measure the original size

Its characteristics; prevent deformation, restitution of a shooting method.

Method 3 rule 3.1 Measurement of smaller exhibits, traces should be selected as the minimum measurement unit to mm-scale black and white, color scale and transparent scale,

The error rate can not exceed one per cent of its edges shall be legible scale.

3.2

Measurement larger exhibits, traces of tape should be used. Common are steel tape and leather tape measure, generally in cm measuring scale unit length

More than 2m.

3.3

before the shooting, would not reflective, crease-free flat scale, the subject is placed on one side of the body, pointing to the side of the scale subject. Take

When taken, the camera lens and the subject and should be kept vertical scale, the scale should be subject at the same focal plane.

3.4

When shooting lateral object, the scale should be placed below the subject, and the screen is proportional to the lateral placement; shooting longitudinal object scale should

Placed on one side of the subject, and the screen is proportional to the longitudinal placement.

3.5

black and white photography, as the subject is dark tone, choose black white stripe substrate dimensions; as a subject light colors, use white

Substrate color black stripe scale. When color photography, in addition to the choice of the above dimensions, you can also choose a variety of color and white ratio ruler. Transparent subject when shooting, you can choose a transparent scale.

3.6

is subject more than 10cm, in order to ensure an accurate picture rata reduction scale should be used when shooting is not less than 10cm.

3.7

Shooting stride, rutting and other large range traces of evidence, should be in proportion to one side of the tape is placed through the screen in the subject.

3.8

when shooting single footprint, the scale should be placed at the side of the arch. When using right-angle scale, the scale of the short side should be placed in the heel

Below.

3.9

When shooting fingerprints, the scale should be placed in the finger and fingerprint perpendicular or parallel to the bottom section is placed on the side of fingerprints.

3.10

stereoscopic shooting mark evidence, the subject should be placed on one side of the scale the object in the same plane.

3.11

proportional photographic lens used should use a macro lens or a standard lens, you should not use a wide-angle or fish-eye lens.

When using a digital camera 3.12 proportional photographic lens focal length should be set to change according to frame size digital camera imaging device

Operators, the lens focal length standard lens focal length.

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