# What does it mean ?

**URL:** <https://forums.openmv.io/t/what-does-it-mean/1163>\
**Category:** OpenMV Boards\
**Created:** [March 13, 2019, 8:17pm UTC](https://forums.openmv.io/t/what-does-it-mean/1163 "2019-03-13T20:17:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![duyci](https://avatars.discourse-cdn.com/v4/letter/d/71c47a/32.png) [@duyci](https://forums.openmv.io/u/duyci)\
**Post date:** [March 13, 2019, 8:17pm UTC](https://forums.openmv.io/t/what-does-it-mean/1163/1 "2019-03-13T20:17:34Z")

</div>

This is the example code of the QR code. But I have some question about the this code.  
What is the code mean in this line

```python
 for code in img.find_qrcodes():

```

And what is the behind of the find\_qrcodes() function. How can I find the explanation about the some function.

```python
# QRCode Example
#
# This example shows the power of the OpenMV Cam to detect QR Codes
# using lens correction (see the qrcodes_with_lens_corr.py script for higher performance).

import sensor, image, time

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)
sensor.set_auto_gain(False) # must turn this off to prevent image washout...
clock = time.clock()

while(True):
    clock.tick()
    img = sensor.snapshot()
    img.lens_corr(1.8) # strength of 1.8 is good for the 2.8mm lens.
    for code in img.find_qrcodes():
        img.draw_rectangle(code.rect(), color = (255, 0, 0))
        print(code)
    print(clock.fps())

```

---

<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:** [March 14, 2019, 3:55pm UTC](https://forums.openmv.io/t/what-does-it-mean/1163/2 "2019-03-14T15:55:49Z")

</div>

Hi, the method finds QR Codes. The C code that implements it is here:

[https://github.com/openmv/openmv/blob/master/src/omv/img/qrcode.c](https://github.com/openmv/openmv/blob/master/src/omv/img/qrcode.c)