Manual: CMOS Industrial Camera LOGLUX® i5Version 1.08 (04/07)

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Upon the completion of the last integration cycle, the residual potentials of the pixels are inverted and translated into digital numerical values.

Please note that the multiple integration slope mode does not work when the rolling shutter mode is selected.

There are four registers (PROFILE_INIT0 / PROFILE_INIT1 / PROFILE_INIT2 / PROFILE_INIT3) that allow the dynamic range of the IBIS5 sensor to be varied. They can be used to define both the number of integration cycles and the integration time for the individual integration cycles. A valid integration time is an integer number given in nanoseconds; if zero is entered in one of the above-mentioned registers, the associated integration cycles is skipped.

Possible register settings are shown in the following examples:

This is a typical example of the single integration slope mode.

The only integration cycle is carried out at the highest initial potential in 38.885ms.

The left photo of Figure 3 was taken with this setting.

This is an example of the multiple integration slope mode.

The first integration cycle is run at the third largest initial potential in 200μs. Thereafter, the second integration cycle is carried out at the lowest initial potential in 10μs. Because of the first ‚long‘ integration time, evaluable residual potentials are obtained for the dark pixels, whereas in general very low residual potentials, or none at all, are

obtained for the bright pixels. As compared with the first integration cycle, slightly lower residual potentials are obtained for the dark pixels as a result of the second 'short' integration time, while the bright pixels now reach evaluable residual potential levels. This register setting is, thus, suitable for images with primarily dark regions.

Another example of the multiple integration slope mode.

Four integration cycles are carried out here, with the integration times being reduced by a power of ten each, starting from 35ms. By a clever selection of the integration time length, a dynamic (contrast) range of >100dB in the active frame can be implemented in four integration cycles. The right-hand photo in Figure 3 was

taken with this setting.

When taking highly dynamic images, variations of the register settings may be necessary to get optimum results.

The following procedure is recommended for setting the register:

First a suitable exposure time - preferably that in register PROFIL_INT3 - is set for the darkest region of the frame. Thereafter, integration cycles are added one by one, preferably starting with register PROFIL_INT2. The integration times of all integration cycles will then be summed up to give the previously determined optimum exposure time for the darkest image regions.

Users of the LOGLUX® LuxWare configuration tool are also recommended to apply the above procedure. However, they have to enter the individual integration times into input fields ‚Kneepoint 1...3‘ instead of directly into the registers PROFILE_INT0...2, and into input field ‚Remaining time‘ instead of directly into PROFIL_INT3, respectively. The overall integration time (current integration time) is displayed in input field ‚Remaining time‘.

KAMERA WERK DRESDEN GmbH

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