User Guide

Nokia Customer Care 6(a) - Baseband Troubleshooting

Company Confidential RH-51/52, RH-67/68

Image taking condition effect on image quality

This chapter lists some of the factors, which may cause poor image quality if not taken

into account, and thus result in complaints from customers.

Several issues affect the image quality and will need to be taken into account when

shooting pictures; the listed items are normal to camera operation.

Distance to target

The lens in the module is specified to operate satisfactorily from 40 cm to infinite dis-

tance of scene objects. In practice, the operation is such that close objects may be

noticed to get more blurred when distance to them is shortened from 40 cm. Lack of

sharpness will be first visible in full resolution (1Mpixel) images. If observing just the

viewfinder, even very close objects may seem to appear sharp.

Sharpness of picture edges

The lens performance degrades in image edges, and generally the image is sharpest in

the center part. Particularly this applies to distant objects (> 1 meter).

See the following figure.

Figure 30: Sharpness of picture is worse in edges than in center

Geometrical distortion

The camera lens will cause some amount of so called barrel distortion in images. In prac-

tice, this appears as bending of straight objects in edges of the image.

See the figure below. Note geometrical barrel distortion in background for example (wall

in the background).