CMV300 datasheet(35/56 Pages) AMSOSRAM

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Reference:CMV300-datasheet-v2.11

CMV300 Datasheet

Page 33 of 54

5.5 IMAGE SUBSAMPLING

To maintain the same field of view but reduce the amount of data coming out of the sensor, a subsampling mode is

implemented on the chip. Different subsampling schemes can be programmed by setting the appropriate registers.

These subsampling schemes can take into account whether a color or monochrome sensor is used to preserve the Bayer

pattern information. The registers involved in subsampling are detailed below. A distinction is made between a simple

and advanced mode (can be used for color devices). Subsampling can be enabled in every windowing mode.

5.5.1 SIMPLE SUBSAMPLING

Image subsampling - simple

Default value

Description of the value

Number_lines

1-2

488

The value in this register defines the total number of lines

read out by the sensor (min=1, max=488)

Sub_s

35-36

Number of rows to skip (min=0, max=487)

Sub_a

37-38

Identical to Sub_s

The figures below give two subsampling examples (skip 4x and skip 1x).

Sub_s = 4

Sub_a = 4

Number_lines = sum of red lines

Sub_s = 1

Sub_a = 1

Number_lines = sum of red lines

FIGURE 37: SUBSAMPLING EXAMPLES (SKIP 4X AND SKIP 1X)

5.5.2 ADVANCED SUBSAMPLING

When a color sensor is used, the subsampling scheme should take into account that a Bayer color filter is applied on the

sensor. This Bayer pattern should be preserved when subsampling is used. This means that the number of rows to be

skipped should always be a multiple of two. An advanced subsampling scheme can be programmed to achieve these

requirements. Of course, this advanced subsampling scheme can also be programmed in a monochrome sensor. See

the table of registers below for more details.

Image subsampling - advanced

Default value

Description of the value

Number_lines

1-2

488

The value in this register defines the total number of lines

read out by the sensor (min=1, max=488)

Sub_s

35-36

Should be ‘0’ at all times

Sub_a

37-38

Number of rows to skip, it should be an even number

between (0 and 486).

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