picamera 1.10 教程及api中文简译（二）快速理解picamera

转自：点击打开链接

3、快速理解picamera

通过默认配置，开启摄像头，并预热10秒钟。

<code class="language-python hljs  has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> time<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> picameracamera = picamera.PiCamera()<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:    camera.start_preview()    time.sleep(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>)    camera.stop_preview()<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">finally</span>:    camera.close()</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li></ul>

运行后，可以看到摄像头的指示灯亮起10秒钟后熄灭。这里需要注意的是，每次调用后都需要通过close释放掉picamera的资源。 
下面演示了Python的with语句块，来隐式的开启picamera执行并最后释放掉资源（调用了close()）

<code class="language-python hljs  has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> time<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> picamera<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">with</span> picamera.PiCamera() <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> camera:    camera.start_preview()    time.sleep(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>)    camera.stop_preview()</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

下面这个例子介绍了picamera的某些属性可以被动态调整。在例子中，亮度属性被逐渐增加。

<code class="language-python hljs  has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> time<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> picamera<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">with</span> picamera.PiCamera() <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> camera:    camera.start_preview()    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>:        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> i <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> range(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">100</span>):            camera.brightness = i            time.sleep(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.2</span>)    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">finally</span>:        camera.stop_preview()</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>

下面这个例子演示了，picamera将分辨率设置为640*480并开启摄像头进行预览60秒，并将预览内容写入名为”foo.h264”的文件中。

<code class="language-python hljs  has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> picamera<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">with</span> picamera.PiCamera() <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> camera:    camera.resolution = (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">640</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">480</span>)    camera.start_preview()    camera.start_recording(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'foo.h264'</span>)    camera.wait_recording(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">60</span>)    camera.stop_recording()    camera.stop_preview()</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

摄像头的默认分辨率为显示器的分辨率，如果显示器被禁用，则默认分辨率为1280*768。

这里需要注意的是，wait_recording()方法替代了time.sleep()方法，并且同时开始录制，此方法会抛出错误（例如磁盘已满），所以如果用time.sleep来代替wait_recording的话，stop_recording()的执行会被time.sleep所阻断，带休眠时间以后才会被执行。

下面这个例子演示的是，在开启摄像头之前设置了一些参数，然后捕捉一张照片存储到foo.jpg的文件中：

<code class="language-python hljs  has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> time<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> picamera<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">with</span> picamera.PiCamera() <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> camera:    camera.resolution = (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1280</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">720</span>)    camera.start_preview()    camera.exposure_compensation = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>    camera.exposure_mode = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'spotlight'</span>    camera.meter_mode = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'matrix'</span>    camera.image_effect = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'gpen'</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 初始化预热摄像头</span>    time.sleep(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>)    camera.capture(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'foo.jpg'</span>)    camera.stop_preview()</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li></ul>

下面这个例子可以利用picamera来给拍摄的图像上打上Exif标记。

<code class="language-python hljs  has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> time<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> picamera<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">with</span> picamera.PiCamera() <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> camera:    camera.resolution = (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2592</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1944</span>)    camera.start_preview()    time.sleep(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>)    camera.exif_tags[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'IFD0.Artist'</span>] = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Me!'</span>    camera.exif_tags[<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'IFD0.Copyright'</span>] = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Copyright (c) 2013 Me!'</span>    camera.capture(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'foo.jpg'</span>)    camera.stop_preview()</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>

接下来的文档会详细介绍Exif标记的完整属性。

下面这个例子演示拍摄连续拍摄100次，每次暂停60秒，并且将拍摄的内容以“image{counter:02d}.jpg的格式保存在磁盘上，其中d为递增变量。

<code class="language-python hljs  has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> time<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> picamera<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">with</span> picamera.PiCamera() <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> camera:    camera.resolution = (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1280</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">720</span>)    camera.start_preview()    time.sleep(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>)    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> i, filename <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> enumerate(camera.capture_continuous(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'image{counter:02d}.jpg'</span>)):        print(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Captured image %s'</span> % filename)        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> i == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">100</span>:            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>        time.sleep(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">60</span>)    camera.stop_preview()</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li></ul>

下面这个例子演示了，在低分辨率的情况下，通过capture_sequence方法快速捕捉图像：

<code class="language-python hljs  has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> time<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> picamera<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">with</span> picamera.PiCamera() <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> camera:    camera.resolution = (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">640</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">480</span>)    camera.start_preview()    start = time.time()    camera.capture_sequence((        <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'image%03d.jpg'</span> % i        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> i <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> range(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">120</span>)        ), use_video_port=<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">True</span>)    print(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Captured 120 images at %.2ffps'</span> % (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">120</span> / (time.time() - start)))    camera.stop_preview()</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li></ul>

下面这个例子演示了，通过picamera来捕捉一张图像，并且通过RGB格式进行解码，生成一个numpy的图像阵列。

<code class="language-python hljs  has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> time<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> picamera<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> picamera.array<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">with</span> picamera.PiCamera() <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> camera:    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">with</span> picamera.array.PiRGBArray(camera) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> stream:        camera.resolution = (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1024</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">768</span>)        camera.start_preview()        time.sleep(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>)        camera.capture(stream, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'rgb'</span>)        print(stream.array.shape)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>