Principles of Operation
7
Vi
Vi
V
Vi
V
Vi
Look-Up Tables (LUTs)
The DT3162 board provides two LUTs that you can use to change the
value of an incoming pixel or affect the displayed image (also called
palette matching). When the LUT gets an input pixel value, the
DT3162 board retrieves the output value for that particular pixel from
the LUT and passes the output value to the region of interest (see
for more information). Since the board has a 10-bit ADC, each
LUT has 1024 locations. However, since the board processes the 10-bit
data into 8-bit data, you can enter only pixel values of 0 to 255 in each
location.
You specify the relationship between the pixel input value and the
LUT output value by loading the LUT with different processing
setups. For example, you can pass an image unaltered (the default
setting for LUT 0, known as identity), or you can perform pixel point
operations, such as image multiplication and division, intensity
correction, and reverse-video (the default setting for LUT 1), before
passing the image on.
As an example, assume that the LUT is loaded with the identity
pattern. Pixel input values 0 to 3 have an output value of 0 (black).
Pixel input values 4 to 7 have an output value of 1, and so on, up to
pixel input values 1020 to 1023, which have an output value of 255
(white).
As another example, if you load the LUT with an inverse or negative
pattern, pixel input values 0 to 3 have an output value of 255, pixel
input values 4 to 7 have an output value of 254, and so on, up to pixel
input values 1020 to 1023, which have an output value of 0.
As a final example, assume that you are only interested in looking at
pixels whose input values to the LUT range from 600 to 855. You
could load an output value of 0 for pixel input value 600, an output
value of 1 for pixel input value 601, and so on, up to 255 for pixel
input value 855. The rest of the LUT locations could then be loaded
with either 0 (black) or 255 (white).
Содержание DT3162
Страница 1: ...DT3162 UM 19131 C User s Manual ...
Страница 4: ......
Страница 39: ...29 A Specifications ...
Страница 56: ...Appendix B 46 ...
Страница 57: ...47 C RS 170 and CCIR Specifications and the DT3162 RS 170 Specification 48 CCIR Specification 52 ...
Страница 66: ...Appendix C 56 ...
Страница 67: ...57 D Values for Use with the DT Active Monochrome Frame Grabber Control ...
Страница 76: ......
Страница 80: ......