EPC635 datasheet(34/97 Pages) EPC

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Dual MGX mode with phase-shifted integration time (motion blur reduction)

When dual_mgx_mode = 1 and int_len_mgx1_en = 0, the UE, UO, LE, LO storage gate control signals mgx (mga, mgb) are generated as

two independent groups as mgx0 (mga0, mgb0) and mgx1 (mga1, mgb1). As a result, two correlation frames DCS0 and DCS1 (or DCS2

and DCS3) can be acquired simultaneously (see Figure 32). The upper row pixels store DCS0 (or DCS2) while the lower row pixels store

DCS1 (or DCS3). The vertical pixel pairs (e.g. UE/LE) must be treated for distance calculation as if they are one single pixel. This comes at

the cost of a reduced resolution along the y-axis. The result provides a total of 160x60 pixel-field readout with an effective 3D TOF resolu-

tion of 160x30 pixel.

mga0

mgb0

mga1

mgb1

DCS 0

DCS 1

DCS 0

DCS 1

led_mod

mga0

mgb0

mga1

mgb1

Int_len

DCS0: mga0 0°, mgb0 180°

DCS1: mga1 90°, mgb1 270°

2x 160x30 pixel

Pixel field:

Figure 32: Dual MGX mode with phase-shifted integration time

(upper and lower rows independently controlled by mgx0 and mgx1 with different phase shifts)

IMPORTANT: This mode requires that adjacent pixels look to the same point on the target and receive the same amount of light. Other-

wise, calculated distance values are not reliable.

Dual MGX mode with different integration times (High dynamic range)

When dual_mgx_mode = 1 and int_len_mgx1_en = 1, the UE, UO, LE, LO storage gate control signals mgx (mga, mgb) are generated as

two independent groups as mgx0 (mga0, mgb0) and mgx1 (mga1, mgb1). Both groups provide exactly the same DCS modulation signals

(phases). One stops earlier than the other due to different integration times (see Figure 33). The effect: As a consequence, the two pixels

collect different amount of light simultaneously. There is no restriction about which integration time is shorter or longer with respect to the

other. The upper row pixels integrate with Int_len_hi/lo register value, while the lower row pixels integrate with Int_len_mgx1_hi/lo value.

The upper and lower pixels (e.g. UE, LE) can be used independently for distance calculation. This comes at the cost of a reduced resolu-

tion along the y-axis. Instead of one frame with 160x60 pixels, a single readout provides two DCS or black and white frames with an effect-

ive resolution of 160x30 pixels but with different integration times.

Characteristics subject to change without notice

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