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You Are Here : Home >> Products >> Image test chart >> Esser Test Chart >> REGISTRATION TEST CHART

REGISTRATION TEST CHART

he TE179 is designed to measure fregistration of video cameras.
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Date:2017-08-23  Browse:
  • Introduction
  • Product Software

REGISTRATION TEST CHART


REFLECTANCE

 


The TE179 is designed to measure fregistration of video cameras.


The circuit arrangement of the measurement shall be as shown in fig. 2.


If light is possible the conditions of shooting shall be as follows


1) The light density of the transparency version shall be 939 cd/m² +/- 5%

    (=2000 lx) at peak white

2) The correlated color temperature of the light source shall be 3200 K +/- 100 K

3) The white balance shall be set manually or automatically to 3200 K +/- 100 K

4) The test chart shall be shot by the camera so that the frame limited by the arrows

    exactly coincides with the edges of the picture displayed on the monitor in

    underscan mode

5) The focus control shall be in auto or manual mode and shall be in best focus

6) The iris control shall be in auto or manual mode

7) Black level corrector „ON“

8) Flare corrector „ON“

9) Black balanced with lens capped at 35mV level

10) White balanced using the illuminator with 100% white chart at 382 cd/m² (= 1200 lx)

11) Color matrixing corrector „OFF“

12) Contour corrector „OFF“

13) Noise reducer „OFF“

14) Aperture corrector „OFF“

15) Black and white shading corrector „ON“ and optimized

16) Gamma corrector set to „1“

17) Gain control shall be set to „0 dB“

18) Optical filter, if any, shall be set to „open“ position

19) The iris shall be adjusted to attain the G-channel signal level of 70% of the

     nominal signal level.

20) A horizontal line which crosses each “V“ mark shall be selected and timing

offsets against G-channel signal, a, a´-b, b´,as shown in fig. 3, shall be

measured of R-channel and B-channel signals, respectively

 

 

Horizontal and vertical displacements,H andV, shall be calculated by the following equations


H = (A+B) / 2

V = (A-B) / 2

whereA = (a+a´) / 2 and B = (b+b`) / 2


This measurments shall be conducted for each five horizontal lines which cross

over the marks.Horizontal and vertical registration errors, RH, RV, shall be

calculated as in:

RH  = (H/Hr) x (4/3)

RV  = (V/Hr) x (4/3)

where Hr is the horizontal sweep time

 

Presentation of the results

The maximum horizontal and vertical registratin errors RHmax ,RVmax in

precentage shall be reported together with teir positions as in column number-row

number. The minus signal shall precede the reported figures in case that

R-channel and B-channel signal lead the G-channel signal. The plus sign shall

be applied for the opposite case, as exempliefied for the case depicted in fig.3.

RHmax  = + 0,12 % at 1 - 5

RVmax = +0,11 % at 5 - 1

The specification of the lens and its focal length shall also be reported.

Extraction of registration errors


The segments a, a´-b, b´shall be considered as vectors whose origines are the selected

crossing points of the line with „V“ marks of the G-channel taken as reference is c for a,

d for a´,e for b, and f for b´as  exemlified in fig. 3. As to sign of a, a´,b and b´, the direction

of the horizontal scanning is taken to be positive.