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1M28 and 1M75 User's Manual
Figure 3: Typical Output at Half Saturation, 1ms Exposure Time
Figure 3 depicts the histogram of pixel output values when the average pixel level output
is 128DN.
Figure 4: Typical Output at Half Saturation, 10ms Exposure Time
Figure 4 depicts the histogram of pixel output values when the average pixel level output
is 128DN.
Dark Blemishes
Dark blemishes are areas of the sensor where the pixel(s) are not as responsive as the
average pixel. Dark blemishes can be isolated single pixel defects, but can also be found in
clusters. Figure 3 and Figure 4 show the distribution of dark blemishes.
1.3 Pixel Response
Three principal modes of pixel response are possible: Linear response, LINLOG response
for high dynamic imaging, and logarithmic response for high dynamic imaging.
Linear response
In the linear response mode, the camera works similar to a classical CCD camera,
integrating the photo-generated charges in each pixel during the exposure time. In this
mode the output signal is a linear function of the number of photons accumulated in each
pixel during the integration time. If the number of photons accumulated in one pixel
exceeds the pixel capacity, the pixel saturates, and the output signal is truncated to the
maximum level.
This mode is advantageous if linearity of the response is needed over the whole dynamic
range, and for applications with intra scene dynamics up to 40dB-60dB amplitude.
DALSA
PRELIMINARY
9
03-32-00525-03
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