Sch"after+Kirchhoff SK1024U3PD Uživatelský manuál stáhnout pdf (Strana 21)

Farbzeilen-ZK.indd • Page 34

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11-2014 E

Performing a white balance correction of the individual R, G and B

components of the line signal results in the intensities of the three basic

colors produced using a white template (sheet of paper) being matched

over the entire sensor length.

First, a coarse adjustment of the RGB signals in the oscilloscope display

of the line signal is performed using the Gain Controller in the Gain/

Offset dialog. The red, green and blue curves are now coincident,

Second, the curved line signals can now be flattened, which counteracts

any manifestations of lens vignetting, inhomogeneous illumination and

non-uniformity of the sensor. A scan of a white template over a defined

distance is performed to produce a 2D image. The software calculates

a reference curve to correct for variations in brightness. The resulting

look-up table is stored in the flash-memory of the camera and, there-

after, the correction is automatically applied within the camera. A new

scan of the white template reveals a homogenous intensity distribution

over the entire image. During this process, the software also corrects

for template irregularities and dust flecks automatically.

White balance

Color correction

Zoomed section around the field L18, uncorrected

Zoomed section around the field L18, corrected using ICC-Profile

Line signal of the brown wooden surface (small amount of blue)

Area scan of the wooden surface before color correction

Zoomed section of

after color correction

A white balance correction is not a guarantee of color fidelity for all

colors in a colored template. Disturbances can arise from the spectral

properties of the illumination unit or of the sensor, as well as from the

whiteness properties of the template used for the white balance.

For effective color reproduction by the entire scanner, a standardized

color calibration is necessary using an IT8-Target of defined size and

color palette. The IT8-Target is imaged by the scanner and the software

calculates an ICC-Profile on the basis of defined reference values.

Subsequent scans can use this profile to produce images with reliable

color fidelity.

The

SKan-G software produces lossless pictures with an embedded

ICC-Profile for storage in .png and other formats.

Wood surface inspection with the color line camera

SK22800GJRC-XC

Pixel : 3x 7 600 (RGB), 9 .3 x 9 .3 μm², Sensor length : 70 .68 mm

Line frequency : max. 4 .93 kHz, Interface: Gigabit Ethernet

Measuring range : 320 mm x 2 500 mm

Resolution : 600 dpi, 42 μm/ pixel

Picture size : 7 600 x 60 000 pixel (24-b it), in the

PC RAM

Storage format : bmp, png with embedded ICC-Profile

Caption:

Line signal after RGB signal adjustment using a white template

Area scan for determination of the reference signal for white balance

Line signal after white balance

Area scan of an IT8-Target with active white balance

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