Question

我正在尝试启动网络摄像头并使用python捕获图像我使用了以下代码

@media (min-width: 601px) {
  .desktop-hide {
    display: none !important;
  }
}

@media (max-width: 600px) {
  .mobile-hide {
    display: none !important;
  }
}

* {
  box-sizing: border-box;
}

.wrapper {
  border: 1px solid seagreen;
  max-width: 800px;
  display: flex;
  flex-flow: column wrap;
  align-items: center;
}

.main {
  display: flex;
  flex-flow: row;
  max-width: 600px;
  min-width: 550px;
  border: 1px solid orangered;
}

.timer {
  display: flex;
  justify-content: center;
}

.left-col, .right-col {
  max-width: 300px;
}

* {
  box-sizing: border-box;
}

.team {
  background: chartreuse;
}

.score {
  background: brown;
}

.scorers {
  background: steelblue;
}

.cards-desktop {
  background: goldenrod;
}

.carded-players {
  background: darkorange;
}

.left-col, .right-col {
  width: 80%;
  margin: auto;
}

.left-col * >, .right-col * > {
  display: flex;
}

.top > div {
  padding: 5px;
}

.bottom > div {
  height: 25px;
}

.top {
  display: flex;
  flex-flow: column wrap;
  height: 100px;
}

.team,
.scorers {
  height: 50%;
  width: 75%;
}

.score {
  width: 25%;
  display: flex;
  flex: 0 0 100%;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}

@media (max-width: 600px) {
  .main {
    min-width: 100%;
  }

  .top {
    flex-flow: column nowrap;
    height: initial;
  }

  .team, .scorers {
    height: initial;
    width: 100%;
  }

  .score {
    flex: 1 100px;
    align-self: flex-end;
  }

  .scorers {
    order: 1;
  }
}

.right-col .score {
  align-self: flex-end;
}

.right-col .top {
  flex-flow: column wrap-reverse;
}

.left-col .top > *:not(.score), .left-col .bottom > * {
  display: flex;
  justify-content: flex-end;
}

.team, .scorers {
  display: flex;
  align-items: center;
}

.empty {
  height: 28px;
}

.colon {
  height: 95px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 100px;
}

.corners {
  display: flex;
  flex-flow: row;
  width: 100%;
  justify-content: space-between;
}

.corner-left, .corner-right {
  border: 1px solid crimson;
}

启动相机并在按下Esc时关闭，但不捕捉图像。我是否缺少捕获图像的命令？

Answer 1

这段代码可以使用，我只需添加cv2.imwrite并保存你已经使用的帧。如果按下escape，该命令将写入图像：

import cv2
cv2.namedWindow("preview")
vc = cv2.VideoCapture(0)

if vc.isOpened(): # try to get the first frame
    rval, frame = vc.read()
else:
    rval = False

while rval:
    cv2.imshow("preview", frame)
    rval, frame = vc.read()
    key = cv2.waitKey(20)
    if key == 27: # exit on ESC
        cv2.imwrite("image.png", frame)
        break

cv2.destroyWindow("preview")

[编辑：] 确保您使用的是cv2而不是cv，我已更正您的导入语句。您使用的是哪个版本的OpenCV？

启动网络摄像头并使用python捕获图像

1 个答案: