app.py

import gradio as gr
import matplotlib.pyplot as plt
from PIL import Image
from ultralytics import YOLO
import cv2
import numpy as np

def image_preprocess(image):

  img_height, img_width = image.shape[0:2]
  image_converted = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
  ih, iw = [input_size, input_size] # [input_size, input_size] = [640, 640]
  h, w, _ = image.shape # [1944, 2592]

  scale = min(iw/w, ih/h) # min(0.2469, 0.3292) = 0.2469
  nw, nh = int(scale * w), int(scale * h) # [640, 480]
  image_resized = cv2.resize(image_converted, (nw, nh))

  image_padded = np.full(shape=[ih, iw, 3], fill_value=128.0)
  dw, dh = (iw - nw) // 2, (ih-nh) // 2 # [0, 80]
  image_padded[dh:nh+dh, dw:nw+dw, :] = image_resized # image_padded[80:256, 32:224]
  image_padded = image_padded / 255.
  # image_resized = image_resized / 255.
  image_padded = image_padded[np.newaxis, ...].astype(np.float32)
  image_padded = np.moveaxis(image_padded, -1, 1)


  return image_padded, img_width, img_height, image

model = YOLO('best (1).pt')

def response(image):
    res = image_preprocess(image)
    im_rgb = model(res)
    return im_rgb

iface = gr.Interface(fn=response, inputs="image", outputs="image")
iface.launch()