FEATURES

01Use of a telecentric lens.

The OrthoScan-IMAGER uses a telecentric lens patented by iMeasure to obtain orthographic images.

02It can capture a large work of art at a high resolution of 800 ppi.

If the dimensions of the work exceed the capture range ofthe scanner, it can be scanned section by section. A key feature of orthoimaging is that even such segmented images can be easily joined pixel by pixel.
The OrthoScan-IMAGER is equipped with an 800 ppi lens, which is double the 400 ppi optical resolution suitable for magnification / enlargement printing applications, and produces images of 1.5 billion pixels on a B0 format. The working distance of the lens is 127-350mm.
Not only flat surfaces,but also maps with creases, pictures with uneven surfaces, and three-dimensional objects such as earthenware vessels with a diameter of 60 cm can all be scanned in a contactless manner.

03Color reproducibility ΔE < 1.

The white reference is sampled to automatically correct for uneven light intensity of the light sources, peripheral dimming of the lens, and variation in the sensitivity of the sensor pixels.

04Outstanding dimension accuracy.

Dimension ensure error is less than ±0.06%. Dimensional error of less than ±0.01% is achieved with the original software.
The dimensions can be measured from the images obtained through contactless scanning.
There is no need to hold a caliper against the object.

TELECENTRIC LENS FEATURES

　Ortho-photography is a method of projecting images whereby images are obtained by projecting collimated light (parallel rays of light) from infinity. The projected image obtained through a telecentric lens in called an or thoimage.

Three objects: A, B and C, are lined up to be photographed from above.
Figure 1 is a perspective view of how they are photographed.
Figure 2 is a cross-sectional view of photographing points P1 and P2 of a camera featuring a normal optical system, and surfaces of objects A, B and C.

Figure 2-1 shows an image obtained using a normal optical lens with the camera placed at point P1. Figure 2-2 shows an image obtained with the camera placed at point P2.
As seen in both Figures 2-1 and 2-2, subject B appears distorted into an oblong shape at the end opposite to the optical center of the lens. To be more precise, the right side of subject B in Figure 2-1 appears elongated.
In a similar manner, in Figure 2-2 the left side of subject B appears elongated. Therefore, it would be impossible to create a single image by superposing subject B from Figures 2-1 and 2-2 without noticeable distortion.

Then, Figure 3 shows a schematic cross-sectional diagram of the taking of an ortho-photographic image.
As before, an image is taken of subjects A and B from photographing point P1. The resultant image is shown in Figure 3-1. Similarly, an image is taken of subjects B and C and the result is shown in Figure 3-2. As both images are taken from directly above, subject B is the same shape in both Figures 3-1 and 3-2. Therefore, it is possible to superpose subject B from Figure 3-1 and Figure 3-2 to create a single image without distortion.