EPC635 datasheet(63/97 Pages) EPC

63 / 97 page

7.9. Enhanced rolling DCS frame mode

epc635 allows to set for each single DCS access own parameters. This opens also the possibility to acquire in time-sequence DCSx

frames with e.g. different integration times for expanding the dynamic range. The example shown here is using two integration times: 50 µs

for detecting short range objects and 2ms doing the same for the long range.

ADC

TCMI

ADC

TCMI

ADC

TCMI

ADC

TCMI

ADC

TCMI

ADC

TCMI

ADC

TCMI

ADC

TCMI

DCS0(n)

DCS1(n)

DCS2(n)

DCS3(n)

DCS0(n+1)

DCS Acquisition

Illumination

ADC & Readout

Data transfer epc660

16b Parallel

FPGA Processing

Data transfer FPGA

16b Parallel

TOF image (x)

Distance frame (x)

Distance frame (x+1)

Distance frame (x+2)

Distance frame (x-1)

TOF frame 0.15 … 5.0m

2ms integration time

long distance 0.8 ... 5.0m

short & long distance

50µs integration time

short distance 0.15 … 0.8m

10ms equiv. 100fps

Figure 56: Enhanced rolling mode sequence

In such a case the application is responsible e.g. by FPGA to control the epc635 in the right manner and to decouple the data stream ac -

cordingly. The distance per pixel will be calculated out of the data with best exposure, means quality parameters matches best to the nec -

essary quality conditions for good distance calculation. Figure 57 and Figure 58 show a corresponding block diagram and data flow.

The main advantage of such solution is the time equidistant acquisition of the DCSx data in a multi-integration-time (multi-exposure) mode.

Illumination

epc635

CUSTOMER's

FPGA

CUSTOMER's

Host System

TCMI

e.g. 16b Parallel Interface

Shutter

I2C

Commands,

Start/Stop

Sequence

Configuration

Registers

0..20

Image Capture

4 DCS

Processing the 4 DCS

in FPGA:

Distance calculation

Confidence calculation

FPN correction

Temperature compensation

4th order compensation

Amplitude compensation

e.g. Distance & Confidence

Figure 57: Block diagram

Figure 58: Data flow

Characteristics subject to change without notice

63 / 97

Datasheet_epc635-V1.02

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