ASX340AT Datasheet, PDF (45/75 Pages) ON Semiconductor – Color CMOS NTSC/PAL Digital Image

Figure 25: Overlay Calibration
ASX340CS: 1/4-Inch Color CMOS NTSC/PAL Digital Image Sensor
Overlay Character Generator
The position of the target will be used to determine the calibration value that shifts the
row and column position of adjustable overlay graphics.
The overlay calibration is intended to be applied on a device by device basis “in system,”
which means after the camera has been installed. ON Semiconductor provides basic
programming scripts that may reside in the SPI Flash memory to assist in this effort.
Overlay Character Generator
In addition to the four overlay layers, a fifth layer exists for a character generator overlay
string.
There are a total of:
• 16 alphanumeric characters available
• 22 characters maximum per line
• 16 x 32 pixels with 1-bit color depth
ASX340AT/D Rev. H, 8/15 EN
45
©Semiconductor Components Industries, LLC, 2015.