TLDR

I am writing a video recorder with tkinter and cv2. How to pass tkimage raw data to cv2.VideoWriter, cv2.circle, and so on?

Current approach

I using a numpy array (self.data) as a middle man. But this way I need to create a new tkimage each time. So, after creating it once, I want to access tkimage data directly with cv2 functions. The following class encapsulates tkimage and the numpy array:

class Bitmap:
    def __init__(self, size=(512, 512)):
        self.data = np.zeros((size[1], size[0], 3), dtype=np.uint8)
        self._image_id = 0
        self._image = None

    @property
    def size(self):
        return (self.data.shape[1], self.data.shape[0])

    @property
    def width(self):
        return self.data.shape[1]

    @property
    def height(self):
        return self.data.shape[0]

    @property
    def clear(self):
        self.data.fill(0)

    def new_image(self):
        self._image = ImageTk.PhotoImage(image=Image.fromarray(self.data))
        return self._image_id, self._image

    @property
    def image(self):
        return self._image_id, self._image

    def setup(self, canvas):
        self._image = ImageTk.PhotoImage(image=Image.fromarray(self.data))
        self._image_id = canvas.create_image(0, 0, anchor=tk.NW, image=self._image)

Write to self.data:

cv2.circle(self.bitmap.data, (x, y), 5, (255, 255, 255), 1, cv2.LINE_AA)
    

Write to video file:

// self.recorder = cv2.VideoWriter()
self.recorder.write(self.bitmap.data)

Use self.image to update tkinter ui:

// self._image = ImageTk.PhotoImage(image=Image.fromarray(self.data))
id, image = self.bitmap.image
self.canvas.itemconfig(id, image=image)

So, how to write direcly to tkinter.image data?