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当使用NI相机文件生成器时我需要知道帧采集板卡的哪些参数？
主要软件:
主要软件版本: 3.0
主要软件修正版本: N/A
次要软件: N/A
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问题: 当使用NI相机文件生成器时我需要知道帧采集板卡的哪些参数？
解答:
你的相机的规格参数必须兼容NI的帧采集板卡。NI的帧采集板卡的规格参数罗列在下表，包括其定时信号需求和tap配置
| PCI/PXI 1422 | PCI/PXI 1424 | PCI 1426 | PCIe 1427 | PCI/PXI 1428 | PCIe 1429 | PCIe 1430 | PCIe 1433 | PXIe 1435 | |
|---|---|---|---|---|---|---|---|---|---|
| 电气标准 | LVDS /RS-644, RS-422 | LVDS /RS-644, RS-422, TTL | Camera Link |
Camera Link |
Camera Link |
Camera Link |
Camera Link |
Camera Link |
Camera Link |
| 像素时钟频率 | Up to 50 MHz | Up to 50 MHz | Up to 50 MHz | Up to 80 MHz | Up to 50 MHz | Up to 85 MHz | Up to 85 MHz | Up to 85 MHz | Up to 85 MHz |
| 数据带宽 | Up to 16 bits | Up to 32 bits | Up to 24 bits | Up to 24 bits | Up to 32 bits | Up to 80 bits* | Up to 24 bits | Up to 80 bits | Up to 80 bits |
定时信号需求
相机必须满足以下的定时信号需求以被帧采集板卡支持，所有有效像素的Line Enable 和Frame Enable 信号必须激活：
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PCI/PXI-1422, PCI/PXI-1424, PCI-1426, PCI/PXI 1428
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PCIe-1427, PCIe-1429, PCIe-1430, PCIe-1433, PXIe-1435
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Time for Line Enable (LVAL) - Time between Lines
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至少 4 Pixel Clock Counts
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At Least 1 Pixel Clock Count
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Time for Frame Enable (FVAL) - Time Between Frames
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至少100 Pixel Clock Counts
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At Least 20 Pixel Clock Counts
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Blank Lines Between Frames
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至少4 Lines Between Signals (or Use Non-Continuous Enable)
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None
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Tap 配置
Tap配置主要是在相机的配置文件里面存在。tap实际上是可以定义为相机数据的通道，当每一个时钟到来的时候就会对一个tap(通道)采集数据，这个数据就代表一个像素点，例如如果一个相机能够在一个时钟到来的时候能采集两个像素，那么这个相机就是能够支持2tap的相机。
对相机选型的时候要注意所选相机所支持的像素深度，而所支持的像素深度是tap的位数乘以tap的数量，比如tap是8位的，相机支持两个tap，那么如果对于灰度图来讲的话，灰度图的每个像素值是用8位来表示，那么当一个时钟到来时候就可以采集两个像素点。
NI的帧采集板卡的数据总线如果是一个8位的端口，那么该端口最多可容纳8位图像数据。如果一个相机的像素深度大于8位，像素将需要使用一个以上的端口。每一个像素点必须与端口的位数匹配。
| Number of Taps | Bit Depth | PCI/PXI 1422 | PCI/PXI 1424 | PCI 1426 | PCIe 1427 | PCI/PXI 1428 | PCIe 1429 | PCIe 1430 | PCIe 1433 | PXIe 1435 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 Tap | 8 bit | |||||||||
| 10 bit | ||||||||||
| 12 bit | ||||||||||
| 14 bit | ||||||||||
| 16 bit | ||||||||||
| 24 bit RGB | ||||||||||
| 2 Tap | 8 bit | |||||||||
| 10 bit | ||||||||||
| 12 bit | ||||||||||
| 14 bit | ||||||||||
| 16 bit | ||||||||||
| 24 bit RGB | ||||||||||
| 4 Tap | 8 bit | |||||||||
| 10 bit | ||||||||||
| 12 bit | ||||||||||
| 14 bit | ||||||||||
| 16 bit | ||||||||||
| 24 bit RGB | ||||||||||
| 8 Tap | 8 bit | |||||||||
| 10 bit | ||||||||||
| 12 bit | ||||||||||
| 14 bit | ||||||||||
| 16 bit | ||||||||||
| 24 bit RGB | ||||||||||
| 10 Tap | 8 bit | |||||||||
| 10 bit | ||||||||||
| 12 bit | ||||||||||
| 14 bit | ||||||||||
| 16 bit | ||||||||||
| 24 bit RGB |
相关链接: KnowledgeBase 3JH7CQEJ: What is a Camera File, Do I Need One, and How Can I Obtain One?
KnowledgeBase 66Q92TRH: What Are The Differences Between Base, Medium, and Full Camera Link Configurations?
附件:
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报告日期: 08/18/2009
最近更新: 07/22/2013
文档编号: 50HFDNFW