The Effect Of Image Taking Conditions On Image Quality - Nokia RM-313 Service Manual

RM-313
Camera Module Troubleshooting

The effect of image taking conditions on image quality

There are some factors, which may cause poor image quality, if not taken into account by the end user when
shooting images, and thus may result in complaints. The items listed are normal to camera and Xenon flash
operation and are not a reason for changing the camera or Xenon flash modules.
Distance to target (too close)
The Xenon module may overexpose the image if the object is too close to the camera. The flash feedback
system may not work, if the distance to the object is closer than 20cm.
Figure 34 Overexposed image
Distance to the target (too far away)
The power of Xenon flash is limited and if the target is too far, it cannot be illuminated correctly. The
maximum distance for the acceptable image quality is roughly 2m. If the distance is greater than 2m the
images may start to be to dark and the noise level increases. This is normal behavior; do not change the flash
module.
Figure 35 Dark and noisy image
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