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You Are Here : Home >> Products >> Image test chart >> Comprehensive Test Chart >> CERTIFICATE FORTY TWO VERSION 2

CERTIFICATE FORTY TWO VERSION 2

With the new version of the Test Chart “Forty Two” (YE42 Version 2) Image Engineering improved the successful multi-functional chart for testing digital cameras and lenses
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Date:2017-06-20  Browse:
  • Introduction
  • Product Software

        CERTIFICATE FORTY TWO VERSION 2

REFLECTIVE

With the new version of the Test Chart “Forty Two” (YE42 Version 2) Image Engineering improved the successful multi-functional

chart for testing digital cameras and lenses: With one single chart OECF (Opto Electronic Conversion Function), dynamic range,

resolution, texture loss, shading, distortion, lateral chromatic aberration and color reproduction can be measured according to ISO

standards. The chart can be analyzed with the corresponding software (iQ-Analyzer, until version 4 called IE-Analyzer). For analysis

please use the individual reference files delivered with your chart.

 

The chart consits of several components:

 

 

 

   OECF

 

    The gray scale, arranged around the central Siemens star, is used to

    determine the opto electronic conversion function (OECF). It describes

    how the digital camera transfers luminances into digital values. The

    patches are analyzed for all three color channels red, green and blue in

    color images. There are three significant characteristic values derived from

    the OECF: SNR (relation between signal and noise), Visual Noise (takes into

    account that the visual perception of noise can be different for observers

    compared to a mere SNR approach) and Dynamic Range (contrast in a scene 

    reproduced by the digital camera).

 

 

 

Patch

Step

Measured

Reference

Deviation

1

 

0.06

 

2

 

0.12

 

3

 

0.19

 

4

 

0.26

 

5

 

0.33

 

6

 

0.41

 

7

 

0.49

 

8

 

0.58

 

9

 

0.67

 

10

 

0.78

 

11

 

0.89

 

12

 

1.01

 

13

 

1.14

 

14

 

1.29

 

15

 

1.46

 

16

 

1.65

 

17

 

1.88

 

18

 

2.15

 

19

 

2.50

 

20

 

3.00

 

Background

 

0.80

 

 

  Color  

    The color patches, are arranged in four blocks around the OECF patches. They are based on

    the X-Rite ColorChecker SG and are used for evaluation of color reproduction. The patches

   are converted into color coordinates in the CIE L*a*b* color space (represents the color

    reception of the human visual system). From these values the color distance Delta E, that

    describes the color reproduction quality, is calculated.

 

 

 

 

L

a

b

 

 

L

a

b

 

 

L

a

b

 

A1

30

54

-22

 

B1

13

27

-29

 

C1

79

-2

-7

 

A2

59

33

-27

 

B2

39

29

-47

 

C2

79

11

-2

 

A3

30

56

-56

 

B3

20

2

-33

 

C3

84

-18

-3

 

A4

48

-15

-39

 

B4

57

-14

-26

 

C4

80

14

6

 

A5

59

-25

-19

 

B5

16

-13

-16

 

C5

81

-14

27

 

A6

17

-21

-3

 

B6

58

-2

-31

 

C6

56

28

34

 

A7

62

-36

-12

 

B7

51

-44

-10

 

C7

58

21

16

 

A8

12

1

8

 

B8

60

-39

18

 

C8

51

-48

13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L

a

b

 

 

L

a

b

 

 

L

a

b

 

D1

23

21

27

 

E1

57

20

17

 

F1

42

-3

-23

 

D2

61

35

69

 

E2

34

15

-47

 

F2

42

53

20

 

D3

27

22

-51

 

E3

52

-47

47

 

F3

38

58

35

 

D4

93

-1

-3

 

E4

76

-1

-2

 

F4

59

-1

-2

 

D5

5

0

-2

 

E5

22

0

-2

 

F5

32

0

-2

 

D6

71

21

24

 

E6

57

12

23

 

F6

36

15

27

 

D7

69

30

25

 

E7

58

15

15

 

F7

58

15

15

 

D8

15

-20

5

 

E8

63

-39

5

 

F8

58

-32

46

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L

a

b

 

 

L

a

b

 

 

L

a

b

 

G1

32

-17

28

 

H1

50

11

-29

 

I1

72

-32

-2

 

G2

20

43

-40

 

H2

71

-25

68

 

I2

67

17

73

 

G3

74

2

76

 

H3

45

54

-24

 

I3

45

-25

-27

 

G4

42

0

-2

 

H4

27

0

-2

 

I4

4

0

-1

 

G5

52

-1

-2

 

H5

70

-1

-2

 

I5

93

-1

-3

 

G6

61

14

15

 

H6

37

27

43

 

I6

57

24

23

 

G7

58

17

17

 

H7

27

19

29

 

I7

59

22

25

 

G8

54

-48

49

 

H8

62

-54

52

 

I8

53

15

50

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L

a

b

 

 

L

a

b

 

 

L

a

b

 

J1

78

11

14

 

K1

17

33

9

 

L1

37

63

10

 

J2

87

-17

4

 

K2

45

62

44

 

L2

15

31

-11

 

J3

81

2

-6

 

K3

56

33

4

 

L3

39

62

32

 

J4

82

-11

-7

 

K4

60

36

18

 

L4

47

62

47

 

J5

64

-1

-2

 

K5

59

43

67

 

L5

72

16

77

 

J6

36

0

-2

 

K6

74

-9

73

 

L6

77

4

77

 

J7

11

-1

-2

 

K7

52

1

52

 

L7

72

-16

72

 

J8

58

-17

56

 

K8

75

-27

73

 

L8

14

12

14

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    RESOLUTION / SIEMENS STARS    

    Resolution is measured in the center and the image corners using sinusoidal Siemens stars.

    There are 5 stars, one in the center and four half stars in the corners of the target. The stars are

    divided into segments and the resolution is measured for each of them. There are eight segments

    for the center star and three for each of the corner stars. Finally the mean value of the segments

    for each star and additionally for the corners, the mean value of all four stars gets reported.

 

 

 

 

 

 

 

         Two pairs of Siemens stars are included on the left and the right side of the chart. Each                    

         pair consists of one Siemens star with 100% modulation and one low contrast star with

         20% modulation.

 

 

 

 

 

 

 

                         

 

  RESOLUTION / SLANTED EDGES

 

             Two subcharts, each with a horizantal and a vertical edge, are included in the

             Forty-Two. The resolution is determined for each slanted edge.

 

 

 

 

TEXTURE LOSS

The etric 'texture loss' describes the treatment of fine details with low contrast by an imaging system. The dead leaves structure

is developed to assess this phenomenon.It is made of circels in all sizes and colors at a limited contrast level. A fourier transform

of an image of this structure taken with a camera provides the power spectrum that the camera is able to reproduce. In 2014 the

dead leaves structure and the analysis were improved by Image Engineering.

The Forty-Two version 2 contains two patches of the latest dead leaves developement at different contrast levels.

 

 

 

                The analysis of the dead leaves pattern delivers a MTF.

 

 

 

 

 

 

SHADING

 

Shading describes the loss of light from the center of an image to the corner and is measured using the gray background.

 

 DISTORTION

    Distortion is an geometrical aberration caused by the lens that results in a variation of the scale

    over the image height. Original straight lines look curved. Distortion is measured by using the

    marks. This structure is also used to determine the lateral  chromatic aberration. A scale factor

    depending on the wavelength of the light that results in color fringes around high contrast

    structures in the corners of an image.

                                                                                                                                                                         

 VISUAL APPRAISAL 

For a visual appraisal of reproduction of details, structures and skin tones in the digitalization process several patches are

included in the Forty-Two.