Kivy 使用 opencv.调整图像大小

2022-01-15 00:00:00 python opencv kivy resize webcam

问题描述

我想在 kivy 中插入一个 opencv 网络摄像头视频.不幸的是，当我这样做并最大化窗口时，图像不会调整到屏幕尺寸.有没有办法做到这一点?

I want to insert an opencv webcam video in kivy. Unfortunately, when I do this and maximize the window the image does not adjust to the screen size. Is there any way to do this ? 

from kivy.app import App
from kivy.uix.image import Image
from kivy.clock import Clock
from kivy.graphics.texture import Texture
import cv2

from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.widget import Widget
from kivy.uix.button import Button
from kivy.lang import Builder
from kivy.core.window import Window
Window.size=(1000,1000)


class KivyCamera(Image):
    def __init__(self, capture, fps, **kwargs):
        super(KivyCamera, self).__init__(**kwargs)
        self.capture = capture
        Clock.schedule_interval(self.update, 1.0 / fps)

    def update(self, dt):
        ret, frame = self.capture.read()
        if ret:
            buf1 = cv2.flip(frame, 0)
            buf = buf1.tostring()
            image_texture = Texture.create(size=(frame.shape[1], frame.shape[0]), colorfmt='rgb')#(480,640)
            image_texture.blit_buffer(buf, colorfmt='bgr', bufferfmt='ubyte')
            # display image from the texture
            self.texture = image_texture


class CamApp(App):
    def build(self):
        self.camera= cv2.VideoCapture(2)
        self.my_camera = KivyCamera(capture=self.camera, fps=10,resolution=(1280,960))
        return self.my_camera

    def on_stop(self):
        self.camera.release()


if __name__ == '__main__':
    CamApp().run()

我希望当窗口大小增加时框架的大小也会增加.当我尝试更改 Texture 中的大小时，它给了我错误.喜欢要么显示奇怪的图像，要么不打开任何窗口.如果有人可以提供帮助，那就太好了.谢谢 ！

I am hoping that the size of the frame increases when winow size increases. When I try to change the size in Texture it gives me error. Like either shows weird images or does not open any window. It would be great if somebody could help . Thanks !

解决方案

你可以这样做:将类类型更改为 BoxLayout.使用 size_hint=(1,1) 将图像小部件添加到 Boxlayout.在 init 中使用大小绑定，如下所示:

you can do this: change the class type to BoxLayout. adding Image widget to Boxlayout with size_hint=(1,1). use size binding in init like this:

self.image = Image(size_hint=(1,1))
self.add_widget(self.image)
self.binding(size=self.Updatesize,
             pos=self.Updatesize)

并像这样在你的类中定义一个函数:

and define a function in your class like this:

def Updatesize(*args):
   self.image.size=self.size
   self.image.pos=self.pos

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