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Document Feedback CMV12000 Functional Description Datasheet • PUBLIC DS000603 • v6 - 00 • 2023 -Sep- 22 84 │ 47 schemes can take into account whether a color or monochrome sensor is used to pre serve the Bayer pattern in…
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CMV12000
Functional Description
Datasheet • PUBLIC
DS000603 • v6-00 • 2023-Sep-22
84 │ 46
Figure 56:
Multiple Windows
7.4.5 Mirroring
The image coming out of the image sensor, can be flipped in Y direction. When flipping in Y is enable,
the bottom left pixel (0, 3071) is read out first instead of the top left one (0, 0). The following registers
are involved in image flipping.
Figure 57:
Mirroring Settings
Reg. Name
Address
Bits
Default
Description
Image_flipping
69
[1:0]
0
0: No mirroring
2: Mirror in Y
7.4.6 Subsampling
This mode is only supported in two sided readout. 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
4096
3072
Y_size_4
Y_start_4
Y_size_3
Y_start_3
Y_size_2
Y_start_2
Y_size_1
Y_start_1
Number_lines_tot = Y_size_1 + Y_size_2 + Y_size_3 + Y_size_4
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CMV12000
Functional Description
Datasheet • PUBLIC
DS000603 • v6-00 • 2023-Sep-22
84 │ 47
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 monochrome and color mode and subsampling in Y (skip rows) and X and Y (skip columns
and rows). Subsampling can be enabled in every windowing mode.
Depending on the subsampling and color mode different subsampling schemes are possible.
Figure 58:
Subsampling Schemes
Color Mode
Y-Subsampling
X&Y-Subsampling
Monochrome
Read out 1 row, skip 1,5,9… rows
Read out 1 column and row, skip 1 column and row
Color
Read out 2 rows, skip 2, 6, 10 … rows
Read out 2 column and row, skip 2 column and rows
Y-Subsampling
Below you can find an overview of the settings used for monochrome and color devices together with
some examples for Y-subsampling.
Figure 59:
Y-Subsampling Settings for Monochrome
Reg. Name
Address
Bits
Default
Description
Number_lines_tot
1
[15:0]
3072
Total number of lines read out from the sensor (1 to
1536)
Sub_offset
66
[15:0]
0
Value = (number_of_lines_to_skip +1) /2
Sub_step
67
[15:0]
1
Value = (number_of_lines_to_skip +1)
Sub_en
68
[1]
0
Set to 0
Color
68
[0]
1
Set to 1
Color_exp
68
[3]
1
Set to 1
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CMV12000
Functional Description
Datasheet • PUBLIC
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84 │ 48
Figure 60:
Y-Subsampling for Monochrome Examples (skip 5 and skip 1)
Figure 61:
Y-Subsampling Settings for Color
Reg. Name
Address
Bits
Default
Description
Number_lines_tot
1
[15:0]
3072
Total number of lines read out from the sensor (1 to
1536)
Sub_offset
66
[15:0]
0
Set to 0
Sub_step
67
[15:0]
1
Value = (number_of_lines_to_skip/2) +1
Sub_en
68
[1]
0
Set to 0
Color
68
[0]
1
Set to 0
Color_exp
68
[3]
1
Set to 0
Sub_offset = 3
Sub_step = 6
Number_lines_tot = sum of red lines
Sub_offset = 1
Sub_step = 2
Number_lines_tot = sum of red lines