# AprilTags x DataMatrix - Performance (FPS)

**URL:** <https://forums.openmv.io/t/apriltags-x-datamatrix-performance-fps/321>\
**Category:** OpenMV Boards\
**Created:** [July 1, 2017, 6:23am UTC](https://forums.openmv.io/t/apriltags-x-datamatrix-performance-fps/321 "2017-07-01T06:23:00Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![newsilver](https://avatars.discourse-cdn.com/v4/letter/n/b5a626/32.png) [@newsilver](https://forums.openmv.io/u/newsilver)\
**Post date:** [July 1, 2017, 6:23am UTC](https://forums.openmv.io/t/apriltags-x-datamatrix-performance-fps/321/1 "2017-07-01T06:23:00Z")

</div>

Hi,

I need much more unique IDs of implemented of Aprilags.  
My next option is Data Matrix, but the library libdmtx have low fps.  
Have intentions to use another library, example: [GitHub - zxing/zxing: ZXing ("Zebra Crossing") barcode scanning library for Java, Android](https://github.com/zxing/zxing)

Or with libdmtx, an option is to pre-locate the code by image filtering.  
A Data Matrix has a high contrast (in theory) and a given cell size. If you shring the image so that cells become one or two pixels large, the Data Matrix will stand-out as a highly textured area, and the gradient will strongly respond.  
Have possible to work ?

Thanks

---

<div class="post-metadata">

**Author:** ![kwagyeman](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.openmv.io/kwagyeman/32/4_2.png) [@kwagyeman](https://forums.openmv.io/u/kwagyeman)\
**Post date:** [July 1, 2017, 3:29pm UTC](https://forums.openmv.io/t/apriltags-x-datamatrix-performance-fps/321/2 "2017-07-01T15:29:33Z")

</div>

We can’t use lib zxing because it’s not in C. That said, just use an qrcode instead of a data matrix code. Both are similar but you have a lot more FPS with qr codes. QR code version 1 can be decoded at about 10 FPS when seen.

As for April Tags, you can make a composite image with them if you wanted to. I.e. put 3 tags right next to each other that represent a super tag. This would allow you to cube the number of digits you can encode.

However, it’s just easier to use QR codes.