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Electronic Shutter Types#

The shutter type determines the way in which image data is captured and processed. Depending on the design of the imaging sensor, your camera model has more than one shutter type.

If your camera model has more than one shutter type, see the Sensor Shutter Mode topic for information about how to change shutter types.

优点和缺点#

Sensor Shutter Type 优点 缺点
Global shutter 非常适合拍摄快速移动的对象 较高的环境噪声
Rolling shutter 较低的环境噪声 如果拍摄的是快速移动的对象,可能会发生图像失真。
Global Reset Release shutter 较低的环境噪声
非常适合拍摄快速移动的对象
必须使用闪光灯。

Available Shutter Types#

Global Shutter#

During image acquisition, all of the sensor's pixels start exposing at the same time and also stop exposing at the same time. Immediately after the end of exposure, pixel data readout begins and proceeds row by row until all pixel data has been read. This is particularly useful if you want to capture fast moving objects or if the camera is moving rapidly while capturing images.

传感器读出时间是所有行读出时间的总和。因此,传感器的读取时间受图像 ROI 高度的影响。您可以通过检查相机的 SensorReadoutTime 参数的值来确定读出时间。

在部分相机机型上,Sensor Readout Mode 功能可用。此功能使您可以缩短传感器读出时间。

Global Shutter

Rolling Shutter#

During image acquisition, the camera exposes the pixel rows one after the other, with a temporal offset (tRow) from one row to the next. With this method, the ambient noise is typically significantly lower than with the global shutter method.

触发帧开始时,相机将重置第一行并开始对其进行曝光。对于大多数相机,此行是图像 ROI 的第一行。

不久之后 (= 1 x tRow),相机将重置第二行并开始曝光该行。再过一小段时间后 (= 1 x tRow),相机将重置第三行并开始曝光该行。

这一直持续到最后一个像素行为止。对于大多数相机,此行是图像 ROI 的最后一行。

tRow 的长度因相机型号而异

Rolling Shutter

每一行的曝光时间结束时,系统都会读出各行的像素值。所有行的曝光时间都相同。因为每行的读出时间也是 tRow,所以读出结束时的时间偏移量与曝光开始时的时间偏移量相同。

传感器读出时间是所有行读出时间的总和:tRow x 图像 ROI 高度

因此,传感器的读出时间还取决于图像 ROI 的高度。要确定读出时间,请检查相机的 SensorReadoutTime 参数的值。

影响帧周期的其他因素#

除了曝光时间和传感器读出时间以外,还有其他一些因素会影响帧周期,例如,为下一次采集准备传感器所需的时间。

这些其他因素因相机型号和配置而异。因此,Basler 建议计算帧周期。为此,请检查相机的 ResultingFrameRate 参数值并取其倒数:

1/最终帧速率

这考虑了所有影响因素。

可能的图像失真(滚动快门效应)#

On rolling shutter cameras, if the object or the camera is moving very fast during image capture, image distortion may occur. This is also known as the rolling shutter effect.

其原因在于各行开始曝光之间的时间偏移量。

为防止滚动快门效应,Basler 建议使用闪光灯。大多数相机都可以提供闪烁窗口输出信号,以方便使用闪光灯。

曝光激活信号#

On rolling shutter cameras, if your camera provides an Exposure Active output signal, the Exposure Active signal goes high when the exposure time for line one begins and goes low when the exposure time for the last line ends. This means that the signal width is greater than the exposure time.

Global Reset Release Shutter#

The Global Reset Release (GRR) shutter is a variant of the rolling shutter. It combines the advantages of the global and rolling shutter.

On GRR shutter cameras, all of the pixels in the sensor start exposing at the same time. However, at the end of exposure, there is a temporal offset (tRow) from one row to the next.

The tRow values are the same as on rolling shutter cameras and vary by camera model.

Global Reset Release Shutter

With the GRR shutter type, you must use flash lighting. Otherwise, the brightness in the acquired images will vary significantly from top to bottom due to the differences in the exposure times of the individual rows. Also, when you are capturing images of fast moving objects, images can be distorted due to the temporal shift caused by the different exposure end times of the individual rows.

大多数相机都可以提供闪烁窗口输出信号,以方便使用闪光灯。

影响帧周期的其他因素#

→ See above.

详情#

显示所有相机型号

相机型号 时间偏移量 tRow [µs]
a2A1920-51gcBAS -
a2A1920-51gcPRO -
a2A1920-51gmBAS -
a2A1920-51gmPRO -
a2A1920-160ucBAS -
a2A1920-160ucPRO -
a2A1920-160umBAS -
a2A1920-160umPRO -
a2A2590-22gcBAS 7a
a2A2590-22gcPRO 7a
a2A2590-22gmBAS 7a
a2A2590-22gmPRO 7a
a2A2590-60ucBAS 7a
a2A2590-60ucPRO 7a
a2A2590-60umBAS 7a
a2A2590-60umPRO 7a
a2A3840-13gcBAS 9a
a2A3840-13gcPRO 9a
a2A3840-13gmBAS 9a
a2A3840-13gmPRO 9a
a2A3840-45ucBAS 9a
a2A3840-45ucPRO 9a
a2A3840-45umBAS 9a
a2A3840-45umPRO 9a
a2A4504-5gcBAS -
a2A4504-5gcPRO -
a2A4504-5gmBAS -
a2A4504-5gmPRO -
a2A4504-18ucBAS -
a2A4504-18ucPRO -
a2A4504-18umBAS -
a2A4504-18umPRO -
a2A5320-7gcBAS -
a2A5320-7gcPRO -
a2A5320-7gmBAS -
a2A5320-7gmPRO -
a2A5320-23ucBAS -
a2A5320-23ucPRO -
a2A5320-23umBAS -
a2A5320-23umPRO -
a2A5328-4gcBAS -
a2A5328-4gcPRO -
a2A5328-4gmBAS -
a2A5328-4gmPRO -
a2A5328-15ucBAS -
a2A5328-15ucPRO -
a2A5328-15umBAS -
a2A5328-15umPRO -
acA640-90gc -
acA640-90gm -
acA640-90uc -
acA640-90um -
acA640-120gc -
acA640-120gm -
acA640-120uc -
acA640-120um -
acA640-121gm -
acA640-300gc -
acA640-300gm -
acA640-750uc -
acA640-750um -
acA720-290gc -
acA720-290gm -
acA720-520uc -
acA720-520um -
acA780-75gc -
acA780-75gm -
acA800-200gc -
acA800-200gm -
acA800-510uc -
acA800-510um -
acA1280-60gc 14
acA1280-60gm 14
acA1300-22gc -
acA1300-22gm -
acA1300-30gc -
acA1300-30gm -
acA1300-30uc -
acA1300-30um -
acA1300-60gc 14
acA1300-60gm 14
acA1300-60gmNIR 14
acA1300-75gc -
acA1300-75gm -
acA1300-200uc -
acA1300-200um -
acA1440-73gc -
acA1440-73gm -
acA1440-220uc -
acA1440-220um -
acA1600-20gc -
acA1600-20gm -
acA1600-20uc -
acA1600-20um -
acA1600-60gc 8-bit pixel formats: 13
12-bit and 12-bit packed pixel formats: 17
acA1600-60gm 8-bit pixel formats: 13
12-bit and 12-bit packed pixel formats: 17
acA1920-25gc 35
acA1920-25gm 35
acA1920-25uc 35
acA1920-25um 35
acA1920-40gc -
acA1920-40gm -
acA1920-40uc -
acA1920-40ucMED -
acA1920-40um -
acA1920-40umMED -
acA1920-48gc -
acA1920-48gm -
acA1920-50gc -
acA1920-50gm -
acA1920-150uc -
acA1920-150um -
acA1920-155uc -
acA1920-155ucMED -
acA1920-155um -
acA1920-155umMED -
acA2000-50gc -
acA2000-50gm -
acA2000-50gmNIR -
acA2000-165uc -
acA2000-165um -
acA2000-165umNIR -
acA2040-25gc -
acA2040-25gm -
acA2040-25gmNIR -
acA2040-35gc -
acA2040-35gm -
acA2040-55uc -
acA2040-55um -
acA2040-90uc -
acA2040-90um -
acA2040-90umNIR -
acA2040-120uc -
acA2040-120um -
acA2440-20gc -
acA2440-20gm -
acA2440-35uc -
acA2440-35ucMED -
acA2440-35um -
acA2440-35umMED -
acA2440-75uc -
acA2440-75ucMED -
acA2440-75um -
acA2440-75umMED -
acA2500-14gc 35
acA2500-14gm 35
acA2500-14uc 35
acA2500-14um 35
acA2500-20gc -
acA2500-20gcMED -
acA2500-20gm -
acA2500-20gmMED -
acA2500-60uc -
acA2500-60um -
acA3088-16gc 25
acA3088-16gm 25
acA3088-57uc 8
acA3088-57ucMED 8
acA3088-57um 8
acA3088-57umMED 8
acA3800-10gc 8 位像素格式:31.6
12 位压缩像素格式:36.4
12 位像素格式:39.6
acA3800-10gm 8 位像素格式:31.6
12 位压缩像素格式:36.4
12 位像素格式:39.6
acA3800-14uc 8 位像素格式:24.725
12 位压缩像素格式:28.475
12 位像素格式:30.975
acA3800-14um 8 位像素格式:24.725
12 位压缩像素格式:28.475
12 位像素格式:30.975
acA4024-8gc 35a
acA4024-8gm 35a
acA4024-29uc 8-bit pixel formats: 10a
12-bit and 12-bit packed pixel formats: 12a
acA4024-29um 8-bit pixel formats: 10a
12-bit and 12-bit packed pixel formats: 12a
acA4096-11gc -
acA4096-11gm -
acA4096-30uc -
acA4096-30ucMED -
acA4096-30um -
acA4096-30umMED -
acA4096-40uc -
acA4096-40ucMED -
acA4096-40um -
acA4096-40umMED -
acA4112-8gc -
acA4112-8gm -
acA4112-20uc -
acA4112-20ucMED -
acA4112-20um -
acA4112-20umMED -
acA4112-30uc -
acA4112-30ucMED -
acA4112-30um -
acA4112-30umMED -
acA4600-7gc 8 位像素格式:39.4
12 位压缩像素格式:43.4
12 位像素格式:47.4
acA4600-10uc 8 位像素格式:30.75
12 位压缩像素格式:33.875
12 位像素格式:37
acA5472-5gc 8-bit pixel formats: 52a
12-bit and 12-bit packed pixel formats: 55a
acA5472-5gm 8-bit pixel formats: 52a
12-bit and 12-bit packed pixel formats: 55a
acA5472-17uc 8-bit pixel formats: 13a
12-bit and 12-bit packed pixel formats: 16a
acA5472-17ucMED 8-bit pixel formats: 13a
12-bit and 12-bit packed pixel formats: 16a
acA5472-17um 8-bit pixel formats: 13a
12-bit and 12-bit packed pixel formats: 16a
acA5472-17umMED 8-bit pixel formats: 13a
12-bit and 12-bit packed pixel formats: 16a
boA4096-93cc -
boA4096-93cm -
boA4112-68cc -
boA4112-68cm -
boA4500-45cc -
boA4500-45cm -
boA6500-36cc -
boA6500-36cm -
boA8100-16cc -
boA8100-16cm -
daA1280-54lc -
daA1280-54lm -
daA1280-54uc -
daA1280-54um -
daA1600-60lc -
daA1600-60lm -
daA1600-60uc -
daA1600-60um -
daA1920-15um -
daA1920-30uc -
daA1920-30um -
daA1920-160uc -
daA1920-160um -
daA2500-14lc -
daA2500-14lm -
daA2500-14uc -
daA2500-14um -
daA3840-45uc -
daA3840-45um -
puA1280-54uc -
puA1280-54um -
puA1600-60uc -
puA1600-60um -
puA1920-30uc -
puA1920-30um -
puA2500-14uc -
puA2500-14um -

  1. 无论图像 ROI 设置如何,曝光的第一行始终是传感器的第一行。这可能会导致图像 ROI 曝光开始延迟。而且,无论图像 ROI 设置如何,曝光的最后一行始终是传感器的最后一行。