AR0141CS datasheet(29/48 Pages) ONSEMI

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AR0141CS

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Embedded Data and Statistics

The AR0141CS has the capability to output image data

and statistics embedded within the frame timing. There are

two types of information embedded within the frame

readout.

• Embedded Data:

If enabled, these are displayed on the two rows

immediately before the first active pixel row is

displayed

• Embedded Statistics:

If enabled, these are displayed on the two rows

immediately after the last active pixel row is displayed

Figure 32. Frame Format with Embedded Data Lines Enabled

Image

Status & Statistics Data

HBlank

VBlank

Embedded Data

The embedded data contains the configuration of the

image being displayed. This includes all register settings

used to capture the current frame. The registers embedded

in these rows are as follows:

Line 1: Registers R0x3000 to R0x312F.

Line 2: Registers R0x3136 to R0x31BF, R0x31D0 to

R0x31FF.

NOTE: All undefined registers will have a value of 0.

In parallel mode, since the pixel word depth is 12

bits/pixel, the sensor 16−bit register data will be transferred

over 2 pixels where the register data will be broken up into

8 MSB and 8 LSB. The alignment of the 8−bit data will be

on the 8 MSB bits of the 12−bit pixel word. For example, if

a register value of 0x1234 is to be transmitted, it will be

transmitted over two, 12−bit pixels as follows: 0x120,

0x340.

Embedded Statistics

The embedded statistics contain frame identifiers and

histogram information of the image in the frame. This can be

used by downstream auto−exposure algorithm blocks to

make decisions about exposure adjustment.

This histogram is divided into 244 bins with a bin spacing

of 64 evenly spaced bins for digital code values 0 to 28, 120

evenly spaced bins for values 28 to 212, 60 evenly spaced

bins for values 212 to 216. It is recommended that auto

exposure algorithms be developed using the histogram

statistics on line 1.

The first pixel of each line in the embedded statistics is a

tag value of 0x0B0. This signifies that all subsequent

statistics data is 10 bit data aligned to the MSB of the 12−bit

pixel.

Figure 33 summarizes how the embedded statistics

transmission looks like. It should be noted that data, as

shown in Figure 33, is aligned to the MSB of each word:

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