Simultaneous Read out Timing 1 The exposure time is smaller than the read out time in this timing (see Fig. 4.12). Exposure is started during the sensor read out of the previous frame. The maximal frame rate is in this case (values are given in Table 4.4 and Table 4.5): MaxFrameRate = 1 / (ReadoutTime + TExpDel + TReadoutDel) To avoid a sensor artifact, the exposure must start at a fixed position from the start of the read out of one row. Therefore the exposure start must be delayed by a time TExpDel which can be as long as the read out of one row. The ReadoutTime is the height of ROI multiplied by the read out time of one row (see Table 4.4). F ra m e < n >
F ra m e < n + 1 >
T r ig g e r E x p o s u r e T im e E x p o s u re
R e a d o u t T R e a d o u tD e l
R e a d o u t T im e
Figure 4.12: Simultaneous read out timing 1: exposure time smaller than read out time
Simultaneous Read out Timing 2 The exposure time is bigger than the read out time in this timing (see Fig. 4.13). Exposure is started during the sensor read out of the previous frame. The maximal frame rate is in this case (values are given in Table 4.4): MaxFrameRate = 1 / (ExposureTime + TExpDel1 + TReadoutDel) TExpDel1 is 1.25 Âľs for the MV1-D2048(x1088)(I/C)-160 cameras and 1.042 Âľs for MV1-D2048(x1088)(I/C)-240 cameras. The ReadoutTime is the height of the ROI multiplied by the read out time of one row (see Table 4.4). F ra m e < n >
F ra m e < n + 1 >
T r ig g e r E x p o s u r e T im e E x p o s u re
R e a d o u t R e a d o u t T im e
T R e a d o u tD e l
Figure 4.13: Simultaneous read out timing 2: exposure time bigger than read out time
Sequential Read out Timing In this timing the exposure is started after the read out of the previous frame (see Fig. 4.14). The maximal frame rate is in this case (values are given in Table 4.4): MaxFrameRate = 1 / (ExposureTime + TReadoutDel + ReadoutTime) The ReadoutTime is the height of the ROI multiplied by the read out time of one row (see Table 4.4). 4.1 Reduction of Image Size
33