ASX340AT Datasheet, PDF (19/75 Pages) ON Semiconductor – Color CMOS NTSC/PAL Digital Image

ASX340CS: 1/4-Inch Color CMOS NTSC/PAL Digital Image Sensor
Sensor Pixel Array
Test Patterns
During normal operation of the ASX340AT, a stream of raw image data from the sensor
core is continuously fed into the color pipeline. For test purposes, this stream can be
replaced with a fixed image generated by a special test module in the pipeline. The
module provides a selection of test patterns sufficient for basic testing of the pipeline.
NTSC/PAL Test Pattern Generation
There is a built-in standard EIA (NTSC) and EBU (PAL) color bars to support hue and
color saturation characterization. Each pattern consists of seven color bars (white,
yellow, cyan, green, magenta, red, and blue). The Y, Cb and Cr values for each bar are
detailed in Tables 7 and 8.
Figure 10: Color Bars
Table 7:
EIA Color Bars (NTSC)
Nominal Range
White
Yellow
Cyan
Green
Magenta
Red
Blue
Y
16 to 235
Cb
16 to 240
Cr
16 to 240
180
162
131
112
84
65
35
128
44
156
72
184
100
212
128
142
44
58
198
212
114
Table 8:
EBU Color Bars (PAL)
Nominal Range
White
Yellow
Cyan
Green
Magenta
Red
Blue
Y
16 to 235
Cb
16 to 240
Cr
16 to 240
235
162
131
112
84
65
35
128
44
156
72
184
100
212
128
142
44
58
198
212
114
CCIR-656 Format
The color bar data is encoded in 656 data streams. The duration of the blanking and
active video periods of the generated 656 data are summarized in Tables 9 and 10.
Table 9:
NTSC
Line Numbers
1-3
4-19
Field
2
1
Description
Blanking
Blanking
ASX340AT/D Rev. H, 8/15 EN
19
©Semiconductor Components Industries, LLC, 2015.