Basler L304kc User Manual

Operation and Features
BASLER L304
kc 3-41
Draft
3.10 Image Enhancements
With an L304kc camera, you can expect to achieve excellent image quality by making simple
adjustments to camera settings such as exposure time and gain. Basler has added a new set of
image enhancement features that give you an even wider range of flexibility to meet your image
quality tastes and needs. These enhancements let you tune the camera for best performance
under the wide variety of operating conditions encountered in industrial applications.
3.10.1 Shading Correction
In theory, when a digital camera captures an image of a uniform object, the pixel values output
from the camera should be uniform. In practice, however, variations in optics and lighting and
small variations in the sensor’s performance can cause the camera output to be non-uniform even
when the camera is capturing images of a uniform object. L304
kc cameras are equipped with a
shading correction feature that allows the camera to correct the captured image for variations
caused by optics, lighting and sensor variations. There are two types of shading correction
available on L304
kc cameras, DSNU shading correction and PRNU shading.
3.10.1.1 Guidelines When Using Shading Correction
When using the shading correction feature, make sure to take the following guidelines into
account:
• Any time you make a change to the optics or lighting or if you change the camera’s gain set-
tings or exposure mode, you must generate a new set of PRNU shading values. Using out of
date PRNU shading values can result in poor image quality.
• When you generate the DSNU and PRNU shading values, correction values will be calcu-
lated for all of the pixels in the sensor regardless of how the AOI (see Section 3.7) parame-
ters are set. If you change the AOI settings, you do not need to generate new shading
values.
3.10.1.2 DSNU Shading Correction
In theory, when a line scan camera with a digital sensor captures lines in complete darkness, all
of the pixel values in the captured lines should be near zero and they should be equal. In practice,
slight variations in the performance of the pixels in the sensor will cause some variation in the pixel
values output from the camera when the camera is capturing lines in darkness. This variation is
know as Dark Signal Non-uniformity (DSNU). The DSNU shading correction feature on L304
kc
cameras can correct for the variations caused by DSNU.
Generating a Set of DSNU Shading Values
Before you can use DSNU shading correction, you must generate a set of DSNU shading
correction values. To generate a set of values, perform the following steps:
1. Cover the camera lens, close the iris in the camera lens, or darken the room so that the
camera will be capturing lines in complete darkness.
2. Begin capturing lines either by generating an ExSync signal to trigger line capture or by
setting the camera for free-run exposure.

Basler L304kc Specifications

General

Brand	Basler
Model	L304kc
Category	Security Camera
Language	English