Omron MicroHAWK, Integration Manual

Page: 286 / 378

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MicroHAWK Engine Integration Guide
Color Filter
Color Filter
Disable
No filter is applied to image. If you are attempting to read symbols with no filter applied, a
white balance should be performed first to balance the red, blue, and green cells of the
image sensor.
General Purpose
This is a general purpose filter that is applied to the RGB image to provide a grayscale
image that can be used for most applications.
This filter should be used when reading 2D symbols, 1D symbols that are not positioned
horizontally in the field of view, or a combination of 1D and 2D symbols.
Horizontal 1D Symbols
This filter is applied to the RGB image to provide a grayscale image that is specifically
designed to provide the best suitable image for a horizontally-positioned 1D symbol.
This filter should be used when reading 1D symbols that are positioned horizontally across
the field of view.
Green Interpolate
This filter is applied to the RGB image to provide a grayscale image for decoding similar to
a luminance calculation. Unlike a luminance calculation, Green Interpolate provides an
image 1:1 resolution to the input image. This filter provides better omni-directional symbol
decode performance. Like Horizontal 1D Symbols, and unlike General Purpose, a white
balance is not necessary.
This filter is recommended for most decoding applications that can afford extra processing time.
Note: For high-resolution 1D symbols that are positioned horizontally, the Horizontal 1D
Symbols filter is preferable.
Definition: If you are using a 5 megapixel color MicroHAWK, this filter captures an
image in color. To process the image for symbol decoding, the image
must be filtered or the R, G, and B cells need to be equalized. This can be
done by applying one of the filters available or by performing a white
balance with the current camera configuration before trying to decode a
symbol. This option specifies the filter method that is applied to the RGB
color image to produce a monochrome image.
Usage: < K543, color filter >
Default: Disabled
Options: 0 = Disabled (Raw, No Filter)
1 = Enabled
2 = Horizontal 1D Symbols
3 = Green Interpolate