Camera Measurements

8/2/2019 Camera Measurements

1/31

Camera MeasurementCamera Alignment & Camera Shading

Presenter: John Pierce


2/31

2

Introduction

Contributors

DSC Laboratories, Ontario, Canada Michael Waidson, Chief Applications Engineer Tektronix, Inc.

Getting the best use out of your Waveform Monitoring investment Using Tektronix

Waveform monitors

and their unique displaycapabilities in camera

alignment and camerashading applications


3/31

3

Key Topics

Camera Shading

Camera Alignment

Camera Matching

Image quality all starts with

the correct alignment of thecamera which is used tocapture the scene either on

location or in the studio.


4/31

4

Getting Started

Equipment Required

Waveform Monitor Chip Chart

WFM5000

DSC LabsAmbi 2 Illuminator with

Combi DX1 CDM

24+4R chart

DSC Labs

ChromaDuMonde 28R

chart. This is a front-litchart

DSC LabsAmbi 2 Illuminator with no

chart, but a grid hand

drawn on the diffusersurface with erasable

marker


5/31

5

Terminology

Which came first?

Alignment or Shading

Whats the difference between the two?

What is White Shading

White Balancing?

Black Balancing?


6/31

6

White Shading

Electronically compensating for errors in brightness or color, primarily

generated by the optical system of the camera.

To make white shading adjustments of the camera, a very even lightsource is mandatory.


7/31

7

White Balance

RGB Parade on WFM5000 before white shading adjustment


8/31

8

Vector Display

Vector 20X Gain of correctlyadjusted white shaded camera

Vector Display with incorrectlyadjusted output from the camera


9/31

9

Completed White Balance Display


10/31

10

Before & After


11/31

11

Diamond Display

Perfectly BalancedCamera Outputs

Red Imbalance


12/31

12

Diamond Display with Red Gain Imbalance


13/31

13

RBD Diamond Display Before and After

Before After


14/31

14

Setting Up Correct Colorimetry & Exposure

Ambi 2 with Combi (Rear Lit) ChromaDuMonde (Front Lit)


15/31

15

CIE 1931 Chromaticity Diagram


16/31

16

Gray Scale AdjustmentsUsing the Waveform Monitor

100% Color Bar Signal shown in HD (left) and SD (right)


17/31

17

9 & 11-Step Front Lit ChromaDuMonde Chart

100% Color Bar Signal shown in HD (left) and SD (right)


18/31

18

Tektronix Diamond Displaywith Red Grayscale Error


19/31

19

11-Step ChromaDuMonde Chart


20/31

20

DSC Laboratories Calibrated HD Simulation


21/31

21

Default Camera Settings Before Alignment


22/31

22

Camera Output After Adjustments


23/31

23

Camera Matching


24/31

24

Question Time

Please direct any additional questions to

[email protected]


25/31

25

Contact Information

www.tektronix.com

Local Sales and Marketing [email protected]

For information on Tektronix Waveform Monitors or questions relatedto this presentation please contact:

John Pierce, Product Manager, Video Product Line, Tektronix, Inc., Tel:503 627 6256, E-Mail:[email protected]

For information on Camera Alignment Charts please contact: Michael Wiegand, Sales Manager, DSC Laboratories, www.dsclabs.com

1-866-DSC-LABS (372-5227)

Downloadable material: Camera Measurement PDF http://www2.tek.com/cmswpt/tidetails.lotr?ct=TI&cs=afs&ci=14126&lc=EN
http://www.tektronix.com/mailto:[email protected]://www.dsclabs.com/http://www2.tek.com/cmswpt/tidetails.lotr?ct=TI&cs=afs&ci=14126&lc=ENhttp://www2.tek.com/cmswpt/tidetails.lotr?ct=TI&cs=afs&ci=14126&lc=ENhttp://www.dsclabs.com/mailto:[email protected]://www.tektronix.com/


26/31

26
http://www2.tek.com/cmswpt/tidetails.lotr?ct=TI&cs=afs&ci=14126&lc=EN


27/31

27

Interpreting a Waveform Display
http://www2.tek.com/cmswpt/tidetails.lotr?ct=TI&cs=afs&ci=14126&lc=ENhttp://www2.tek.com/cmswpt/tidetails.lotr?ct=TI&cs=afs&ci=14126&lc=EN


28/31

28

Understanding the Diamond Display


29/31

29

The Beauty of this Display


30/31

30

Understanding the Vector Display


31/31

31

DSC Laboratories Calibrated HD Simulation

Date post:	05-Apr-2018
Category:	Documents
Upload:	sunil-kumar
View:	220 times
Download:	0 times

Camera Measurements

Documents