app.py

import gradio as gr
import zxingcpp
import numpy as np
from PIL import Image

import cv2

def decode(im,col,tol):
    img = cv2.imread(f'{im}')
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    blur = cv2.medianBlur(gray, 5)
    sharpen_kernel = np.array([[-1,-1,-1], [-1,9,-1], [-1,-1,-1]])
    sharpen = cv2.filter2D(blur, -1, sharpen_kernel)
    
    

    try:
        results = zxingcpp.read_barcodes(sharpen)
        return results[0].text,sharpen
    except Exception:
    
        #qr_img=Image.open(im).convert("RGBA")
        qr_img=Image.open(im)
        datas = qr_img.getdata()
        newData = []
        h1 = col.strip("#")
        rgb_tup = tuple(int(h1[i:i+2], 16) for i in (0, 2, 4))
        tol=100
        for item in datas:
            if item[0] in range(rgb_tup[0]-tol,rgb_tup[0]+tol) and item[1] in range(rgb_tup[1]-tol,rgb_tup[1]+tol) and item[2] in range(rgb_tup[2]-tol,rgb_tup[2]+tol):
                newData.append((0,0,0))
            else:
                newData.append((255,255,255))
        qr_img.putdata(newData)
        qr_img.save('conv_im.png')
        img = cv2.imread('conv_im.png')
        try:
            results = zxingcpp.read_barcodes(img)
            print (results[0].text)
            return results[0].text,'conv_im.png'
        except Exception:
            return "QR Code not Detected \nTry choosing the QR code color using the eyedropper in the Color Picker",'conv_im.png'
    


with gr.Blocks() as app:
    with gr.Row():
        with gr.Column():
            in_im = gr.Image(label="QR Image to Decode",type='filepath')
            out_im = gr.Image(type='filepath')
        with gr.Column():
            with gr.Row():
                choose_color = gr.ColorPicker(label="Choose QR color (eyedropper)")
                color_tol = gr.Slider(1,255, step=1,value=50,label="Color Detect Tolerance")
            dec_btn = gr.Button("Decode QR")
            text_out = gr.Textbox(label="Decoded Text")    
    
    dec_btn.click(decode,[in_im,choose_color,color_tol],[text_out,out_im])
app.queue(concurrency_count=10).launch()