[英]python pygame blit. Getting an image to display
I'm trying to get my webcam to show video through pygame. 我正在尝试让我的网络摄像头通过pygame显示视频。 Here is the code:
这是代码:
# import the relevant libraries
import time
import pygame
import pygame.camera
from pygame.locals import *
# this is where one sets how long the script
# sleeps for, between frames.sleeptime__in_seconds = 0.05
# initialise the display window
pygame.init()
pygame.camera.init()
screen = pygame.display.set_mode((640, 480), 0, 32)
# set up a camera object
cam = pygame.camera.Camera(0)
# start the camera
cam.start()
while 1:
# sleep between every frame
time.sleep( 10 )
# fetch the camera image
image = cam.get_image()
# blank out the screen
screen.fill((0,0,2))
# copy the camera image to the screen
screen.blit( image, ( 0, 0 ) )
# update the screen to show the latest screen image
pygame.display.update()
When i try this I get an error from the screen.blit( image, ( 0, 0 ) ) part 当我尝试这个时,我从screen.blit(image,(0,0))部分得到了一个错误
Traceback (most recent call last):
File "C:\Python32\src\webcam.py", line 28, in <module>
screen.blit( image, ( 0, 0 ) )
TypeError: argument 1 must be pygame.Surface, not None
I assume It's because I didn't convert the image into whatever works with pygame, but i don't know. 我认为这是因为我没有将图像转换为pygame可用的任何格式,但我不知道。
Any help would be appreciated.Thanks. 任何帮助将不胜感激。
-Alex -Alex
OK so here is the new code: This one works because it saves the picture to the current folder. 好的,所以这里是新代码:该代码有效,因为它将图片保存到当前文件夹。 figured out why the last one work.
弄清楚了最后一个为什么工作。 the screen is still black although=\\
屏幕仍然是黑色,尽管= \\
# import the relevant libraries
import time
import pygame
import pygame.camera
from pygame.locals import *
# this is where one sets how long the script
# sleeps for, between frames.sleeptime__in_seconds = 0.05
# initialise the display window
pygame.init()
pygame.camera.init()
# set up a camera object
size = (640,480)
screen = pygame.display.set_mode(size,0)
surface = pygame.surface.Surface(size,0,screen)
cam = pygame.camera.Camera(0,size)
# start the camera
cam.start()
while 1:
# sleep between every frame
time.sleep( 10 )
# fetch the camera image
pic = cam.get_image(surface)
# blank out the screen
#screen.fill((0,0,0))
# copy the camera image to the screen
screen.blit(pic,(0,0))
# update the screen to show the latest screen image
p=("outimage.jpg")
pygame.image.save(surface,p)
pygame.display.update()
Try creating a Camera like this. 尝试创建一个像这样的相机。
cam = pygame.camera.Camera(camlist[0],(640,480))
That's how it's done on this page of the pygame docs. 这就是在pygame文档的此页面上完成的操作。
Looking at the API page for pygame.camera
, I found two things that might help. 在
pygame.camera
的API页面上,我发现有两点可能有所帮助。 First, 第一,
Pygame currently supports only Linux and v4l2 cameras.
Pygame当前仅支持Linux和v4l2摄像机。
EXPERIMENTAL!: This api may change or disappear in later pygame releases.
实验!:此api在以后的pygame版本中可能会更改或消失。 If you use this, your code will very likely break with the next pygame release.
如果使用此功能,则您的代码很可能会在下一个pygame版本中中断。
Keep that in mind when wondering why this surprisingly fails. 想知道为什么这出人意料地失败时,请记住这一点。
On a more up-beat note... you can try calling camera.get_raw()
and printing the result. 另外,您可以尝试调用
camera.get_raw()
并打印结果。 It should be a string with raw image data. 它应该是带有原始图像数据的字符串。 If you get an empty string,
None
, or some non-sense text: please share that with us here. 如果您得到一个空字符串,
None
或一些无意义的文本:请在此处与我们分享。 It'll tell if you're getting anything from the camera. 它会告诉您相机是否有东西。
Gets an image from a camera as a string in the native pixelformat of the camera.
从摄像机获取的图像作为字符串以摄像机的本机像素格式显示。 Useful for integration with other libraries.
与其他库集成很有用。
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