DVC DVC-1412 - Binning and Shutter; Binning and Bayer Pattern Color Filter Arrays

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7.6.1 Binning and Shutter:

The following table is provided as a guide for calculating the shutter mode exposure values that

apply in the different binning modes.

The shutter setting for binning modes needs to be shifted with an offset, in order to get the desired

amount of exposure:

mode no exposure 1_line 2_line max line

1x1 0 1 2 1043

2x2 520 521 522 1043

4x4 780 781 782 1043

8x8 910 911 912 1043

7.6.2 Binning and Bayer Pattern Color Filter Arrays

When binning is performed within the CCD, e.g. in the BIN 2x2 mode, the charge from a 4-pixel

quad made up of 2-horizontal and 2-vertical pixels is collected into one CCD horiz-shift-register

element. The charge value that is read out therefore corresponds to a summation of the 4-pixel

quad.

P11 + P12

P21 + P22

---------------

1-data-value

---------------

In this mode, the user trades off resolution for frame rate and sensitivity.

In a Bayer-filter color camera, the 2x2 binning mechanism described above creates a quad

summation which results in R+G+G+B value.

R11 + G12

G21 + B22

---------------

1-data-value

---------------

This R+G+G+B value does not represent any meaningful color information; however, it may be

used as a luminance value. Application developers may use BIN 2x2, BIN 4x4 or BIN 8x8 modes

(in a color camera) to create a fast monochrome image during focusing, fast object/image

manipulation in the field-of-view etc. and then revert to a full-resolution 12f/s color image after

determining an image of interest.