Hi,
Could you give me information of the checkerboard pattern which is showed Figure 24 in Quick Start Guide, please?
Best regards,
Shimizu
This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hi,
Could you give me information of the checkerboard pattern which is showed Figure 24 in Quick Start Guide, please?
Best regards,
Shimizu
Hi Shimizu san,
We recommend using a checker board with odd no. of squares in one direction and even no. of squares in the other direction. There is no hard requirement on the dimensions of the squares. When you are using checker board for calibration, kindly make sure it occupies major part of the FoV.
Thanks and Regards
Nithin Jose
Texas Instruments
Hi Jose,
Thank you for your support.
I'm sorry. I am not good at English.
Could you tell me the mean of below your answer, please?
"We recommend using a checker board with odd no. of squares in one direction and even no. of squares in the other direction. "
Please see the attached. Which case is correct?
Best regards,
Shimizu
Hi Shimizu,
You can use smaller paper if you make sure that it occupies major part of the FoV. Please make sure that none of the pixels are saturated also.
Regards
Nithin
Nithin,
In the VoxelViewer User Guide http://www.ti.com/lit/ug/sbou157/sbou157.pdf , it says to "contact TI for the checkerboard pattern" so I assume this means to obtain a file that can be printed. Where is the file available? If not on the website, how does a customer request this file?
~Leonard
Tip for anyone looking for a calibration pattern, OpenCV has a tool to generate them:
https://github.com/opencv/opencv/blob/master/doc/pattern_tools/gen_pattern.py
Usage example:
python gen_pattern.py -o out.svg -r 11 -c 8 -T circles -s 20.0 -R 5.0 -u mm -w 216 -h 279
-o, --output - output file (default out.svg)
-r, --rows - pattern rows (default 11)
-c, --columns - pattern columns (default 8)
-T, --type - type of pattern, circles, acircles, checkerboard (default circles)
-s, --square_size - size of squares in pattern (default 20.0)
-R, --radius_rate - circles_radius = square_size/radius_rate (default 5.0)
-u, --units - mm, inches, px, m (default mm)
-w, --page_width - page width in units (default 216)
-h, --page_height - page height in units (default 279)
-a, --page_size - page size (default A4), supercedes -h -w arguments
-H, --help - show help