Imager Field of View and Resolution

The HE40T's megapixel imager, with a dual field optical system, can provide you the best image for 1-D and 2-D applications.

The 1.3 Million Pixel imager is divided into near field and far field decode zones. In each zone, the resolution is 1024 x 640 pixels (see Figure 1.25). In this mode of operation the reader utilizes the highest resolution creating the widest working range on bar code and 2-dimensional symbols of all densities. The trade-off is the amount of time the reader spends processing the image. This time can be reduced by optimization functions:

• If only the near field is used (small, high density symbols), the far field image can be ignored.

• If only the far field is used (large, lower density symbols), the near field can be ignored.

• Further optimization may be obtained by "windowing" the field to a smaller area.

FIGURE 1-39. 

SXGA Imaging Area

FIGURE 1-40. 

Imager Focal Lengths