Display barcode using camera - Raspberry PI

rpi-barcode-reader.py

##############################
#
#   RPI bar code reader
#   @author github.com/john-e
#   
#   @lib
#       zbar - https://github.com/npinchot/zbar
##############################

import sys
import io
import time
import picamera
from PIL import Image
import zbar

# Create the in-memory stream
stream = io.BytesIO()
# create a reader
scanner = zbar.ImageScanner()
# configure the reader
scanner.parse_config('enable')

with picamera.PiCamera() as camera:
    #configure camera
    camera.video_stabilization = True
    camera.sharpness = 50
    camera.contrast = 30

    #start preview window
    camera.start_preview()

    #initialize stream reader
    stream = io.BytesIO()
    try:
        for foo in camera.capture_continuous(stream, format='jpeg'):
            # Truncate the stream to the current position (in case
            # prior iterations output a longer image)
            stream.truncate()
            stream.seek(0)

            # obtain image data
            pil = Image.open(stream).convert('L')
            width, height = pil.size
            raw = pil.tostring()

            # wrap image data
            image = zbar.Image(width, height, 'Y800', raw)

            # scan the image for barcodes
            scanner.scan(image)

            # extract results
            for symbol in image:
                # do something useful with results
                print 'decoded', symbol.type, 'symbol', '"%s"' % symbol.data

            # clean up
            del(image)

            #sleep to avoid 100% cpu usage
            time.sleep(0.05)
    finally:
        camera.stop_preview()

Hello
I used a similar code
but it executes the recognition only of qrcode
It does the recognition of the barcode.
You know why?

import io
import time
import picamera
from PIL import Image
import zbar

import RPi.GPIO as GPIO
import time

import subprocess

def blueLed():
command = 'sudo python /home/pi/rpi_ws281x/python/blueLed.py'
subprocess.Popen(command , shell=True,stdout=subprocess.PIPE)

def redLed():
command = 'sudo python /home/pi/rpi_ws281x/python/redLed.py'
subprocess.Popen(command , shell=True,stdout=subprocess.PIPE)

def greenLed():
command = 'sudo python /home/pi/rpi_ws281x/python/greenLed.py'
subprocess.Popen(command , shell=True,stdout=subprocess.PIPE)

def noneLed():
command = 'sudo python /home/pi/rpi_ws281x/python/noneLed.py'
subprocess.Popen(command , shell=True,stdout=subprocess.PIPE)

greenLed()

GPIO.setmode(GPIO.BCM)

buzzer

GPIO.setup(23,GPIO.OUT)

led

GPIO.setup(25,GPIO.OUT)

GPIO.output(25,True)

Create the in-memory stream

stream = io.BytesIO()

with picamera.PiCamera() as camera:
camera.video_stabilization = True
camera.resolution = (1280, 720)
camera.framerate = 30
camera.saturation = -100
camera.sharpness = -100
camera.contrast = 100
camera.start_preview()

img = Image.open('overlay.png')
pad = Image.new('RGB', (
    ((img.size[0] + 31) // 32) * 32,
    ((img.size[1] + 15) // 16) * 16,
    ))

pad.paste(img, (0, 0))

o = camera.add_overlay(pad.tostring(), size=img.size)
o.alpha = 128
o.layer = 3 

time.sleep(3)
camera.capture(stream, format='jpeg')

"Rewind" the stream to the beginning so we can read its content

stream.seek(0)
pil = Image.open(stream)

create a reader

scanner = zbar.ImageScanner()

configure the reader

scanner.parse_config('enable')

pil = pil.convert('L')
width, height = pil.size
raw = pil.tostring()

wrap image data

image = zbar.Image(width, height, 'Y800', raw)

scan the image for barcodes

scanner.scan(image)

GPIO.output(23,True)
time.sleep(0.25)
GPIO.output(23,False)

GPIO.output(25,False)

dato = "";
type = "";

extract results

for symbol in image:
#print 'decoded', symbol.type, 'symbol', '"%s"' % symbol.data
dato = symbol.data
type = symbol.type

print 'decoded', type, 'symbol', '"%s"' % dato

del(image)

if dato=="":
redLed()
else:
greenLed()
dato = ""

time.sleep(1)
noneLed()