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→ROI parameter requirements
|376 x 320
|376 x 320
|
|
|}Related commands：roi.
|}The camera will make necessary adjustments to the user parameters to meet the parameter requirements.
So it is highly recommended that you read out the actual ROI parameters after writing them.
Related commands：roi.
==== Mirror and Flip ====
==== Mirror and Flip ====
===== Mode 1: Grayscale gradient test pattern =====
===== Mode 1: Grayscale gradient test pattern =====
The value of the first column is 0, and the grayscale value increases by 4 for each column to the right.
The value of the first column is 0, and the grayscale value increases by 4 for each column to the right.<br />
<br />
[[File:Test-pattern1.png|link=http://wiki.veye.cc/index.php/File:Test-pattern1.png|center|thumb|800x800px|Test pattern 1]]
[[File:Test-pattern1.png|link=http://wiki.veye.cc/index.php/File:Test-pattern1.png|center|thumb|800x800px|Test pattern 1]]
===ISP===
===ISP===
==== Exposure and Gain Control ====
===== AAROI =====
The camera counts the current image brightness within the AAROI region and uses it for auto exposure and auto gain calculations. By default, AAROI is not enabled, and the real statistical area in effect is the entire area of the output image, i.e., the ROI area.
The AAROI coordinates are relative coordinates within the ROI area. So the area must be smaller than the image ROI.
Related command: aaroi，aaroienable.
===== Exposure =====
The camera exposure time range is (0-1000000/fps)us. All parameters of exposure time are in microseconds. However, due to the properties of the sensor, the actual exposure time unit of the sensor is 1 line, can not be accurate to 1us.
In any mode, the actual current exposure time can be read with the '''''exptime''''' command.
Exposure control modes: ME, AE, AE once.
Related command: expmode，exptime.
====== Manual Exposure(ME) ======
Use a fixed exposure time.
Related command：expmode,metime。
====== Auto Exposure(AE) ======
Automatically adjusts the exposure time of the camera so that the average brightness in the AAROI reaches the target value.
This process continues all the time and therefore allows for rapid adaptation to changes in the environment light.
The target brightness value ranges from 0 to 255, independent of pixelformat.
Related command：expmode,aatarget, aemaxtime.
====== Auto Exposure once(AE once) ======
When the camera is set to ''AE once'' mode by the '''''expmode''''' command, the camera will make one auto exposure adjustment and turn off the auto adjustment after finishing the adjustment. If the adjustment cannot be made to the target brightness due to a mismatch between the environment brightness and the maximum exposure time, the adjustment will also stop after timeout.
Related command：expmode,aatarget, aemaxtime.
===== Gain =====
The gain range of the camera, depending on the sensor used. An increase in gain will lead to an increase in noise, it is recommended not to use too much gain.
{| class="wikitable"
! model
!Range
!Step
|-
|MV-MIPI-IMX178M
|0-48dB
|0.1dB
|}
====== Manual Gain(MG) ======
Use a fixed gain.
Related command：gainmode,mgain。
====== Auto Gain(AG) ======
====== Auto Gain once(AG once) ======
===== Other notes =====
1. When enabling AE and AG at the same time, the camera gives priority to the use of exposure time and minimizes the use of gain. Try to avoid the noise caused by gain.
2. aeag_run_once_save command execute AE&AG once operation and save the results to the camera as manual values.This is a function that is useful when the camera is installed.
===IO Control===
===IO Control===