Image Quality Analysis; Possible Faults In Image Quality; Testing For Dust In Camera Module - Nokia RM-626 Service Manual

RM-626
Camera Module Troubleshooting

Image quality analysis

Possible faults in image quality

When checking for possible errors in camera functionality, knowing what error is suspected significantly
helps the testing by narrowing down the amount of test cases. The following types of image quality problems
may be expected to appear:
• Dust (black spots)
• Lack of sharpness
• Bit errors
In addition, there are many other kinds of possibilities for bad image quality, but those are ruled out from
the scope of this document since the probability of their appearance is small.

Testing for dust in camera module

Symptoms and diagnosis
For detecting these kinds of problems, take an image of a uniform white surface and analyse it in full
resolution. A good quality PC monitor is preferred for analysis. Search carefully, since finding these defects
is not always easy. Figure "Effects of dust on optical path" is an example image containing easily detectable
dust problems.
When taking a white image, use uniformly lightened white paper or white wall. One possibility 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 happens, try to reduce illumination level. Use JPEG image format for analysing, and set the
image quality parameter to 'High Quality'.
Black spots in an image are caused by dirt particles trapped inside the optical system. Clearly visible and
sharp edged black dots in an image are typically dust particles on the image sensor. These spots are searched
for in the manufacturing phase, but it is possible that the camera body cavity contains a particle, which may
move onto the image sensor active surface, for example, when the phone is dropped. Thus it is also possible
that the problem will disappear before the phone is brought to service. The camera should be replaced if the
problem is present when the service technician analyses the phone.
If a dust particle is lying on the infrared filter surface on either side, they are hard to locate because they are
out of focus, and appear in the image as large, grayish and fading-edge 'blobs'. Sometimes they are invisible
to the eye, and thus the user probably does not notice them at all. However, it is possible that a larger particle
disturbs the user, causing need for service.
Figure 36 Effects of dust on optical path
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