Add QR-reader - Githubissues

#installing zbarlight:
#had to update (sudo apt-get update)
#PATH=$PATH:/sbin
#sudo apt-get install libzbar0 libzbar-dev
#sudo pip --proxy 10.0.137.23:8888 install zbarlight

import zbarlight
from PIL import Image
import pandas as pd

def decode_barcode(exposure_time = 0.65):
    old_exp = bpm_sp.cam.acquire_time.value
    old_mode = bpm_sp.cam.image_mode.value
    old_acquire = bpm_sp.cam.acquire.value

    bpm_sp.cam.acquire_time.put(exposure_time)
    bpm_sp.cam.image_mode.put(0)
    bpm_sp.cam.acquire.put(0)
    while(bpm_sp.cam.detector_state.value == 1):
        pass

    bpm_sp.cam.acquire.put(1)
    time.sleep(0.1)
    while(bpm_sp.cam.detector_state.value == 1):
        pass
    time.sleep(0.1)
        #fix this for GUI
    image = bpm_sp.image.read()['bpm_sp_image_array_data']['value'].reshape((960, 1280))
    #return image

    bpm_sp.cam.acquire_time.put(old_exp)
    bpm_sp.cam.image_mode.put(old_mode)
    bpm_sp.cam.acquire.put(old_acquire)

    df = pd.DataFrame(image)
    mean_adjust = df.mean().mean() * 2
    df[df > mean_adjust] = int(df.mean().mean())
    df[df >= (df.mean().max() + df.mean().min()) / 6] = 255
    df[df < (df.mean().max() + df.mean().min()) / 6] = 0

    #plt.imshow(image)
    #image_qr = Image.fromarray(image, 'L')
    image_qr = Image.fromarray(np.array(df), 'L')
    #image_qr.show()
    decoded = zbarlight.scan_codes('qrcode', image_qr)
    if decoded is not None:
        return decoded[0].decode("utf-8")
    return ''
Links:
https://pypi.org/project/zbarlight/
https://pypi.org/project/pyzbar/ (to consider)
NSLS-II-ISS / isstools

Add QR-reader #86
