AR0141CS datasheet(20/48 Pages) ONSEMI

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AR0141CS

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SUBSAMPLING

The AR0141CS supports subsampling. Subsampling

allows the sensor to read out a smaller set of active pixels by

either skipping, binning, or summing pixels within the

readout window.

Figure 23. Horizontal Binning in the AR0141CS Sensor

Isb

Horizontal binning is achieved either in the pixel readout

or the digital readout. The sensor will sample the combined

2x adjacent pixels within the same color plane.

Figure 24. Vertical Row Binning in the AR0141CS Sensor

e−

Vertical row binning is applied in the pixel readout. Row

binning can be configured as 2x rows within the same color

plane.

Pixel skipping can be configured up to 2x in both the

x−direction and y−direction. Skipping pixels in the

x−direction will not reduce the row time. Skipping pixels in

the y−direction will reduce the number of rows from the

sensor effectively reducing the frame time. Skipping will

introduce image artifacts from aliasing.

Table 10. AVAILABLE SKIP AND BIN MODES IN THE AR0141CS SENSOR

Subsampling Method

Horizontal

Vertical

Skipping

Binning

The sensor increments its x and y address based on the

x_odd_inc and y_odd_inc value. The value indicates the

addresses that are skipped after each pair of pixels or rows

has been read.

The sensor will increment x and y addresses in multiples

of 2. This indicates that a GreenR and Red pixel pair will be

read together. As well, that the sensor will read a Gr−R row

first followed by a B−Gb row.

(eq. 4)

x subsampling factor +

1 ) x_odd_inc

(eq. 5)

y subsampling factor +

1 ) y_odd_inc

A value of 1 is used for x_odd_inc and y_odd_inc when no

pixel subsampling is indicated. In this case, the sensor is

incrementing x and y addresses by 1 + 1 so that it reads

consecutive pixel and row pairs. To implement a 2x skip in

the x direction, the x_odd_inc is set to 3 so that the x address

increment is 1 + 3, meaning that sensor will skip every other

Gr−R pair.

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