python - 计算机视觉 openCV2 pyautogui

Question

我正在尝试学习一些有关计算机视觉的知识，但这里没有太多智慧，所以我提前道歉......

最终，我尝试创建某种 bool 语句，从以 RGB 格式捕获的内容中提取颜色。 IE，(RGB，如果捕获了 255,0,0 或概率(？) bool 点/触发器将变为真)下面的代码将截取桌面上 pyautogui 发生的情况的屏幕截图，并打印发生的情况print(frame) 作为循环执行..

from imutils.video import VideoStream
from imutils.video import FPS
import numpy as np
import imutils
import time
import cv2
import pyautogui

fps = FPS().start()

while True:
    # grab the frame from the threaded video stream and resize it
    # to have a maximum width of 400 pixels
    frame = np.array(pyautogui.screenshot(region = (0,200, 800,400)))
    frame = cv2.cvtColor((frame), cv2.COLOR_RGB2BGR)
    frame = imutils.resize(frame, width=400)
    print(frame)


    # show the output frame
    cv2.imshow("Frame", frame)
    key = cv2.waitKey(1) & 0xFF

    # if the `q` key was pressed, break from the loop
    if key == ord("q"):
        break

    # update the FPS counter
    fps.update()

# stop the timer and display FPS information
fps.stop()
print("[INFO] elapsed time: {:.2f}".format(fps.elapsed()))
print("[INFO] approx. FPS: {:.2f}".format(fps.fps()))

我可以在控制台中看到循环执行矩阵格式的数字数组。是否可以从这里提取 RGB 颜色代码，或者它只是对象的像素表示？或者对象的颜色和像素表示？

“框架”窗口是我在 imshow openCV2 中创建的窗口，它几乎出现在通过 pyautogui 捕获的每个彩色屏幕截图中，我可以在控制台输出的矩阵格式的左下角看到它蓝色、红色和白色的 RGB 格式。

我在 Windows 10 笔记本电脑上使用 IDLE 3.6 进行此实验，并通过 Windows CMD 执行 .py 文件。最终是否可以为一系列蓝色或一系列红色和白色创建 bool 触发器？？？谢谢...

Answer 1

非常简单，这篇博文解释了一切: https://www.pyimagesearch.com/2014/03/03/charizard-explains-describe-quantify-image-using-feature-vectors/

需要注意的一件事是颜色以 BGR 顺序出现，而不是 RGB... 将其添加到循环中:

means = cv2.mean(frame)
means = means[:3]
print(means)

最终产品将打印 BGR 顺序中出现的颜色:

from imutils.video import VideoStream
from imutils.video import FPS
import numpy as np
import imutils
import time
import cv2
import pyautogui

fps = FPS().start()

while True:
    # grab the frame from the threaded video stream and resize it
    # to have a maximum width of 400 pixels
    frame = np.array(pyautogui.screenshot(region = (0,200, 800,400)))
    frame = cv2.cvtColor((frame), cv2.COLOR_RGB2BGR)
    frame = imutils.resize(frame, width=400)

    #grab color in BGR order, blue value comes first, then the green, and finally the red
    means = cv2.mean(frame)
    #disregard 4th value
    means = means[:3]
    print(means)


    # show the output frame
    cv2.imshow("Frame", frame)
    key = cv2.waitKey(1) & 0xFF

    # if the `q` key was pressed, break from the loop
    if key == ord("q"):
        break

    # update the FPS counter
    fps.update()

# stop the timer and display FPS information
fps.stop()
print("[INFO] elapsed time: {:.2f}".format(fps.elapsed()))
print("[INFO] approx. FPS: {:.2f}".format(fps.fps()))