cameraOV13850R2A校准和otp编程指导

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OV13850_R2A Calibration and OTP Programming Guide

OV13850_R2A Calibration and OTP Programming

Guide

Last Modified: Jun 27

, 2014

Document Revision: 3.03C

This document is provided "as is" with no warranties whatsoever, including any warranty of merchantability, non-infringement, fitness for any particular

purpose, or any warranty otherwise arising out of any proposal, specification, or sample. OmniVision Technologies,Inc. and all its affiliates disclaim all liability, including

liability for infringement of any proprietary rights, relating to the use of information in this document. No license, expressed or implied, by estoppel or otherwise, to any

intellectual property rights is granted herein. The information contained in this document is considered proprietary to OmniVision Technologies, Inc. and all its affiliates.

This information may be distributed to individuals or organizations authorized by OmniVision Technologies,Inc. to receive said information. Individuals and/or

organizations are not allowed to re-distribute said information.

OV13850_R2A Calibration and OTP Programming Guide

Content

1.1 Lens Correction Calibration........................................................................................................4

1.1.1 Module to module Variation of Lens shading and Color shading......................................4

1.1.2 Shading Variation Under Different Color Temperature......................................................6

1.1.3 Lens Correction Calibration Method..................................................................................6

1.1.4 Lens Correction Calibration Operation Procedure.............................................................7

1.2 White Balance Calibration.......................................................................................................11

1.2.1 Variation of Sensor/Lens/IR Color Response...................................................................11

1.2.2 Method of White Balance Calibration.............................................................................11

1.2.3 Operation Procedure of White Balance Calibration........................................................12

1.3 VCM Calibration.......................................................................................................................13

1.3.1 Variation of VCM .............................................................................................................13

1.3.2 VCM Calibration Method.................................................................................................14

2.1 OV13850_R2A OTP Structure..................................................................................................14

2.2 OV13850_R2A OTP Assignment for Calibration Data..............................................................15

2.3 MID and Lens ID number for OV13850_R2A...........................................................................23

2.4 Procedure of OV13850_R2A Read and Program OTP Content................................................25

2.4.1 Check OTP Group.............................................................................................................25

2.4.2 Program Calibration Data to OTP.....................................................................................26

2.4.3 Read Calibration Data from OTP......................................................................................26

3.1 Uniformity analysis tools – CameraAnalyzer.exe.....................................................................28

3.2 OTP Read/Program tools – OTP_Tool.exe................................................................................29

3.3 Lens correction calculation library for calibration-- LC.library.................................................30

3.4 OTP Apply Driver Sample Code(**).........................................................................................30

This document is provided "as is" with no warranties whatsoever, including any warranty of merchantability, non-infringement, fitness for any particular

purpose, or any warranty otherwise arising out of any proposal, specification, or sample. OmniVision Technologies,Inc. and all its affiliates disclaim all liability, including

liability for infringement of any proprietary rights, relating to the use of information in this document. No license, expressed or implied, by estoppel or otherwise, to any

intellectual property rights is granted herein. The information contained in this document is considered proprietary to OmniVision Technologies, Inc. and all its affiliates.

This information may be distributed to individuals or organizations authorized by OmniVision Technologies,Inc. to receive said information. Individuals and/or

organizations are not allowed to re-distribute said information.

OV13850_R2A Calibration and OTP Programming Guide

OV13850_R2A sensor has 8k bits embedded OTP(One Time Programmable) memory, which is

enough to store camera module calibration data. This document provides general guidelines for

OV13850_R2A camera module calibration, including calibration items and methodology and OTP

programming procedure.

1. OV13850_R2A Camera Module Calibration

OV13850_R2A Camera Module Calibration includes following calibration items: Lens Correction

,White Balance, VCM.

OTP calibration setting includes two parts -- sensor initial setting + OTP key setting. Please don't

load OV DB setting directly.

From ISP pipeline's view, LSC and AWB calibration flow have been changed to get high AWB

calibration accuracy. LSC calibration data should be written back to sensor before AWB

calibration. Please refer to figure 1 to get detail calibration flow.

Figure 1, Calibration flow

1.1 Lens Correction Calibration

1.1.1 Module to module Variation of Lens shading and Color shading

The lens shading also has module to module variation. The variation comes from the following

reasons:

1. Camera module assembly variation such as lens holder alignment with camera module

2. Lens assembly variation

3. Sensor micro lens variation(sensor CRA variation).

4. Pan/tilt of image sensor during assembly

The lens shading variation includes luminance shading, which is very clear shown in Figure 2 and

color shading which is not easy to identify by naked eye without doing lens correction and white

balance. CameraAnalyzer which is introduced in Section 3.1 can be used for the lens shading

analysis.

This document is provided "as is" with no warranties whatsoever, including any warranty of merchantability, non-infringement, fitness for any particular

purpose, or any warranty otherwise arising out of any proposal, specification, or sample. OmniVision Technologies,Inc. and all its affiliates disclaim all liability, including

liability for infringement of any proprietary rights, relating to the use of information in this document. No license, expressed or implied, by estoppel or otherwise, to any

intellectual property rights is granted herein. The information contained in this document is considered proprietary to OmniVision Technologies, Inc. and all its affiliates.

This information may be distributed to individuals or organizations authorized by OmniVision Technologies,Inc. to receive said information. Individuals and/or

organizations are not allowed to re-distribute said information.

Sensor initial setting

+ OTP Key setting

LSC calibration

AWB calibration

Capture Raw

image 1

Enable LSC and write

back LSC calibration

result to sensor

Capture Raw

image 2