Image Quality Analysis; Testing For Dust In Camera Module - Nokia n80 User Manual

RM-91; RM-92
Nokia Customer Care Camera Module Troubleshooting
Examples of good quality images
Figure 74 Good image taken indoors
Figure 75 Good image taken outdoors

Image quality analysis

Testing for dust in camera module

Symptoms and diagnosis
For detecting dust problems, take an image of a uniform white surface and analyse it in full resolution. A
good quality PC CRT monitor is preferred for analysis (avoid using LCD). Search carefully because finding these
defects is not always easy. Figure "Effects of dust on optical path" is an example of an image having easily
detectable dust problems.
When taking a white image, use uniformly lightened white paper or white wall. Another option is to use
uniform light but in this case make sure that the camera image is not flickering when taking the test image.
In case flickering occurs, try to reduce the illumination level. Use JPEG image format for analysing, and set
the image quality parameter to 'High Quality'.
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