brada/caltag

Camera CALibration Tags

caltag's Issues

Fitting page size and position

Hi Brad,

It's good to know that you continue to maintain CalTag. I really like it.

I have a feature request in the generate_pattern script. I want to embed the CalTag pattern in a larger calibration rig. For this, I need the pattern to be aligned with the page boundary and include a proper page size.

I did this manually a few times, but it's be nice to have in automated.

What's needed is a << PageSize statement around the head of the file, such as:

<< /PageSize [1700.79 1700.79] >> setpagedevice

And also an additional shift of the pattern origin (around line 51 of the ps file) to be translation of -4 -4 instead of -2 -2.

Another user might still want the pattern end to be completely within the page, not on the boundary, so it's a judgment call whether to do this. But for me, again, it'd be nice.

Thanks.

Ofri Sadowsky

change paper size to A0

the default paper size is A4, wondering how to change it to A0, or even customized size.

I changed the width and height in the following code, but not working

def output(filename, markers, ids, nrows, ncols,
           blacklevel, whitelevel,
           scale, layout2,
           metric, minHamming, crcBits, idBits, width = 11.7, height = 16.5):

Bug when search radius = 0

In caltag.m, line 620, a search radius is computed to validate saddle points.
When, for some reason, the outcome is rad == 0, this leads to several subsequent faults.

1. validate_point in line 637 always returns false because it processes no points.
2. meshgrid in line 667 returns a single-point grid (0,0), and subsequently imadjust in line 681 crashes due to bad input.

As it seems, the caltag function was writted assuming rad > 0, and if this is not the case it doesn't work properly.

My fix was to add after line 620: rad = max(rad, 2);

Required Matlab Toolboxes

Unlike the README information, the CalTAG package requires at least the following Matlab toolboxes:

• Image Processing
• Optimization -- for lsqnonlin
• Statistics and Machine Learning -- for means

It is important to list all the dependencies, especially for those of us who purchase toolboxes by the gramme.

Is there have a C code?

A very good job, thanks for your sharing! Is there have a C/C++ version?