not able to find items on specific screen area

I’m new to python and I wonder whether it is possible to capture objects on SPECIFIC screen area. I’m trying to make a poker odds calculator that automatically checks the cards and provides you with the information on your chances of winning (like on this website https://www.cardschat.com/poker/tools/poker-odds-calculator/ ). I wrote a code that checks whether there is king of hearts or ace of hearts in your hand, and if so, then in case of Ace of hearts it changes my cards (in the script) to ace of hearts and ace of diamonds. Similar situation in case of kings. So the task is to check BOTH my cards and set them in variables card_one and card_two, then calculate the chance of winning, then check the flop (first three cards on the table and add them to variables (you will need to change "2h", "qh", "4h", "10c", "6c" to variables)) and calculate the chances of winning, then the fourth card and calculations and the fifth card and calculations and wait for new cards and do the same tasks. I honestly have no idea how to capture objects from specific area, it just captures all the objects on the screen.
Here’s the code:

import pied_poker as pp
import numpy as np
import pyautogui
import time
np.random.seed(420)
def find_item_on_screen(card_image, card_one, card_two, card_type) -> bool:
    try:
        pyautogui.locateOnScreen(card_image, confidence=0.9)
        print(f"{card_type}!")
        p1 = pp.Player('Artur', pp.Card.of(card_one, card_two))
        p2 = pp.Player('Opponent', pp.Card.of()) 
        community_cards = pp.Card.of("2h", "qh", "4h", "10c", "6c")
        print(p1)
        print(f'Community cards: {community_cards}')
        simulator = pp.PokerRound.PokerRoundSimulator(community_cards=community_cards, players=[p1, p2], total_players=2)
        num_simulations = 10000
        simulation_result=simulator.simulate(n=num_simulations, n_jobs=1)
        print(simulation_result.probability_of(pp.Probability.PlayerWins(p1)))
        return True
    except pyautogui.ImageNotFoundException:
        print(f"No {card_type}")
        return False

def check_king():
    locate_item = 'KH.png'
    card_one = "kh"
    card_two = "kd"
    card_type = 'KING'
    find_item_on_screen(locate_item, card_one, card_two, card_type)    

def check_aces(): 
    locate_item = 'AH.png'
    card_one = "ah"
    card_two = "ad"
    card_type = 'ACES'
    find_item_on_screen(locate_item, card_one, card_two, card_type)

check_king() 
check_aces()

looked for the same projects on the internet, there weren’t ones

>Solution :

Use the region parameter.

pyautogui.locateOnScreen(card_image, confidence=0.9)
# whole screen

pyautogui.locateOnScreen(card_image, confidence=0.9, region = (left,top,width,height)
# only the part in the region