Spatial Correction
The 8k pixel array consists of 8,192 x 3, 7.5 µm x 7.5 µm high-performance pinned
photodiode pixels. The distance center-to-center between 2 neighbor color rows is 15 µm.
Figure 3: Sensor Row Spacing Diagram
The three rows of pixels are separated by one line of spacing and this line spacing is equal
to 1x the sensor pixel size.
The sensor of the P4-CC-08K03T-01-R works in a global shutter mode: the scene is sampled
at the same time by the three lines of pixels (the red, blue and green components). In order
to get the same zone of the scene sampled in green, then blue, then red, the distance
covered by the scene between 2 samples must be tuned.
The camera offers 4 possibilities:
The scene shifts of 0.5 pixel between 2 exposures
The scene shifts of 1.0 pixel between 2 exposures
The scene shifts of 1.5 pixel between 2 exposures
The scene shifts of 2.0 pixel between 2 exposures
Line shift can also be disabled.
However, this is only correct when the object pixel size is square; i.e., the distance moved
by the object for one EXSYNC period is equal to the width of the object pixel. In some
applications it may not be possible to achieve a ‘square’ object pixel as fine adjustment of
the lens magnification and/or the distance moved for each EXSYNC period is not possible.
This scenario may be especially apparent when trying to integrate the camera into an
existing system.
When it is not possible to generate a square object pixel, color artefacts will occur in the
scan direction and is particularly noticeable at sharp edge transitions. The size of the edge
artefact is proportional to how far the pixel is from square. To correct for this, the camera
has a feature, Line Spatial Correction, which allows fine adjustment of the compensation
mechanism the camera uses to correct for the line spacing.
The following examples of image artefacts show black to white image transitions and the
associated corrected image after applying a specific Line Spatial Correction setting.
