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Camera Test Instructions

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Terms and definitions

For detailed explanation, basic terms are defined below.


Use of the test pictures

There are two different test pictures applied which are marked by unique test patterns. Test picture "Resolution, determination of borders and grey scales"conduces to the examination of all parameters relevant for resolution and representation and contains different bi-tonal test patterns which are neutral in terms of color as well as grey scale patterns, which are explained in detail here. Test picture "Color fidelity, color gradients, grey scale values" contains test patterns of different spectral fields as well as different developings of grey scale values, which are described in detail here.
The active height of the test images should not be less than 20 cm, the printing material should be reflective on front lighting and should be illuminated evenly.
Tested camera should be positioned firmly. The vertical clipping arrows are used to adjust the magnification and to chose the according section of the test picture, depending on the picture format. The horizontal clipping arrows conduce to the horizontal centering of the target. The arrowheads of the black clipping arrows should be completely visible, the white clipping arrows should not be visible anymore. The camera should be positioned in a way that the horizontal clipping of the test picture is parallel to the horizontal camera frame line and the picture layer parallel to the camera layer. On using the test picture "Color fidelity, color gradients, grey scale values", the fact that all spectral test patterns are visible in the camera image must be observed.
The visual resolution (in LW/PH) is the limit below which individual black and white lines can still be distinguished in the test patterns or are displayed with a lower frequency due to aliasing. For this purpose, test picture 1 (camera test picture "Resolution, determination of borders and grey scales") integrates vertical, horizontal and diagonal hyperbolic curves F1, F2, G1, G2, Fs1, Fs2, Gs1, Gs2, FG. The central horizontal visual resolution is determined by observing the vertically aligned hyperbolic curves F1 and G1, the central vertical resolution by the horizontally aligned hyperbolic curves F2 and G2. The 45° diagonal visual resolution is determined by the diagonally aligned test patterns FG. The visual resolution in the border area of the camera can be determined by using the test patterns Fs1, Fs2, Gs1 and Gs2.
To determine the visual resolution, the test picture (either printed in high quality or displayed on a monitor of according size and resolution) has to be positioned and adjusted as described above, to read off the corresponding values by subjective measuring.

Camera test picture "Resolution, determination of borders and grey scales"

To magnify the graphics, please click on the pictures.

Auflösung, Kantenschärfe und Graustufen

Kameratestbild "Auflösung, Kantenschärfe und Graustufen" mit Hinweisen

Element Meaning
A Black frame with black and white arrow markers for horizontal adjustment on 16:9 image format
A1 Black and white arrow markers as assistance for camera adjustment
B Central dual frequency illustration an black frame, conduces to focussing
C Frame lines and boundary arrows for camera image formats 1:1, 4:3, 3:2
D Inclined lines for checking the linearity of the raster and stair stepping
E1 100LW/PH up to 1000LW/PH black bars for measuring the horizontal pulse respond
E2 100LW/PH up to 1000LW/PH black bars for measuring the vertical pulse respond
F1 100LW/PH up to 600LW/PH hyperbolic line display for measuring the central horizontal visual resolution
F2 100LW/PH bis 600LW/PH hyperbolic line display for measuring the central vertical visual resolution
Fs1 100LW/PH bis 600LW/PH hyperbolic line display for measuring the peripheral horizontal visual resolution
Fs2 100LW/PH bis 600LW/PH hyperbolic line display for measuring the peripheral vertical visual resolution
FG 100LW/PH bis 1000LW/PH hyperbolic line display for measuring the inclined visual resolution
G1 500LW/PH bis 2000LW/PH hyperbolic line display for measuring the central horizontal visual resolution
G2 500LW/PH bis 2000LW/PH hyperbolic line display for measuring the central vertical visual resolution
Gs1 500LW/PH bis 1000LW/PH hyperbolic line display for measuring the peripheral horizontal visual resolution
Gs2 500LW/PH bis 1000LW/PH hyperbolic line display for measuring the peripheral vertical visual resolution
H1 vertical grey scale gradients of 10 grey scales for checking the differentiability of the grey scales
H2 horizontal grey scale gradients of 10 grey scales for checking the differentiability of the grey scales
I diagonal black square for checking the correct aspect-ratio, stair stepping by rasterization and for calculation of SFR
J circle with crossed lines for checking of non-linearity on sampling (e.g. wrong aspect-ratio)
K checkerboard pattern to check for compression artefacts
L1 inclined (about 5°) square wave sequence for checking the horizontal aliasing ratio
L2 inclined (about 5°) square wave sequence for checking the vertical aliasing ratio
M1 100 up to 1000 lines square wave for checking the horizontal visual resolution
M2 100 up to 1000 lines square wave for checking the horizontal visual resolution
N markers, which can be used for automatic adjustment

 

Camera test picture "Color fidelity, color gradients, grey scale values“

To magnify the graphics, please click on the pictures.

Kameratestbild „Farbtreue, Farbverläufe, Grauwerte“

Kameratestbild „Farbtreue, Farbverläufe, Grauwerte“ mit Hinweisen

Element Meaning
A Black frame with black and white arrow markers for horizontal adjustment on 16:9 image format
A1 Black and white arrow markers as assistance for camera adjustment
B Frame lines and boundary arrows for camera image formats 1:1, 4:3, 3:2
C TE256: Color and Calibration Test Chart: 11-stepped grey radient, black/white pattern, 12 colors, 4 skin color tones
D TE229: color Key Test Chart: color circle with 30 elementary colors
E TE106: Color Bar Test Chart: 8 fields (black, white + primary colors)
F 16-stepped grey gradient horizontal in two directions including 16-stepped color patch gradient
G 11-sepped grey gradient vertical in two directions
H elementary colors CMYK/RGB black gradient and white gradient in 16 steps
I TE233: 24 little saturated colors and 4 skin color tones
J TE226: HDTV Color Rendition Test Chart (according to Gretag Macbeth)
K TE209: Cine Color Test Chart
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