Python + OpenCV 抓桌面動作

woff · 發表於 2020-9-29 11:48:42

I'm trying to process live screen. There is a game about catching fish. You have to click on fish when it is in circle. I think that I can process my screen with opencv, find fish and click on it with pyautogui.

I did it but problem is program not fast enough to click. By the way game is a mini game in Metin 2 mmorpg. It is like a hack or bot but I just wondering if can I do that.

Here is my code:

import numpy as np
import cv2
from PIL import ImageGrab
import pyautogui
import time
while True:
img=ImageGrab.grab(bbox=(341,208,430,290))
img_np=np.array(img)
#gray=cv2.cvtColor(img_np, cv2.COLOR_BGR2GRAY)
#lower=np.array([57,91,120])
#upper=np.array([65,95,160])
#mask=cv2.inRange(gray,95,130)
#sonuc=cv2.bitwise_and(gray,gray,mask=mask)
#cv2.imshow('frame',mask)
degsk=np.argwhere(img_np==[123,90,57])
if len(degsk)!=0:
#print(degsk)
yerx=341+degsk[int(len(degsk)/2),1]
yery=208+degsk[int(len(degsk)/2),0]
#pyautogui.click(x=yerx, y=yery)
time.sleep(0.8)
if cv2.waitKey(1)&0xFF==ord('q'):
break
cv2.destroyAllWindows()

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As you can see, first I tried mask the screen than I realise that it is not necessary so I found BGR value of fish and programed to find it in numpy array than I took value middle in the array and than i used mouse move function. As I said this is not fast enough to catch fish.

So the program is working but delayed for catch fish. How can I make faster this program?

[color=var(--blue-700)]Game Screen Here

I find IPython best for timing things, so if you start IPython and paste in the following code:

from PIL import ImageGrab
img=ImageGrab.grab(bbox=(341,208,430,290))

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You can then time a statement with:

%timeit img=ImageGrab.grab(bbox=(341,208,430,290))

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and I get this:

552 ms ± 5.91 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)

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So, grabbing the screen takes over 500ms, so you are only going to get under 2 frames/second - without even processing it.

If you want to grab the screen faster, I would suggest ffmpeg. I installed it on my iMac running macOS with homebrew using:

brew install ffmpeg

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I can then see the list of available video sources and find what I need to record the screen with:

ffmpeg -f avfoundation -list_devices true -i ""

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Sample Output

[AVFoundation input device @ 0x7fa7dcf05b40] AVFoundation video devices:
[AVFoundation input device @ 0x7fa7dcf05b40] [0] FaceTime HD Camera
[AVFoundation input device @ 0x7fa7dcf05b40] [1] Capture screen 0 <--- THIS ONE IS THE SCREEN
[AVFoundation input device @ 0x7fa7dcf05b40] AVFoundation audio devices:
[AVFoundation input device @ 0x7fa7dcf05b40] [0] MacBook Pro Microphone
[AVFoundation input device @ 0x7fa7dcf05b40] [1] CalDigit Thunderbolt 3 Audio

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So I know I need input 1 for the screen.

So, if I want to record the screen from top-left corner (0,0) at a width of 400px and height of 200px at 20fps for 10s and pass RGBA8888 data to my fishing program, I can do this:

fmpeg -y -pix_fmt bgr0 -f avfoundation -r 20 -t 10 -i 1 -filter:v "crop=400:200:0:0" -f rawvideo - | ./fish.py

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I can now use the following as my fishing program:

#!/usr/bin/env python3
import numpy as np
import pyautogui
import time
import os, sys
# width, height
w, h = 400, 200
# Bytes per frame - assumes bgr0, i.e. 8-bits of blue, 8-bits red. 8-bits green and 8-bits junk
bytesPerFrame = w * h * 4
while True:
img = sys.stdin.buffer.read(bytesPerFrame)
if len(img) != bytesPerFrame:
break
# Process your video here

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Keywords: pyautogui, screen grab, screen-grab, screengrab, slow, Mac, macOS, Python, capture, screen capture, ffmpeg, PIL, OpenCV

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