Cheetah Python Camera with USB3 Interface
–
User Manual
December 5, 2017
Page
63
of
78
Rev 1.0
Camera
Bit Depth
Data Rate
(Gbps)
Full Resolution USB3
Interface (fps max)
C5180
8
2.8
13
10
2.8
6
10 packed
2.8
10
C4181
8
2.8
20
10
2.8
10
10 packed
2.8
16
C4180
8
2.8
27
10
2.8
13
10 packed
2.8
21
Figure 34: USB3 Typical maximum frame rates verses bit depth.
Note
: Frame rates depend on camera configurations and several factors external to the
camera, such as the host computer performance (host controller card speed, PCIe
interface bandwidth, motherboard, and so on), USB3 cable length, and cable type (5.3.3
Factors Impacting Frame Rate).
5.3 Area of Interest
5.3.1 Overview
For some applications, you might not need the entire image, but only a portion of it. To
accommodate this requirement, Cheetah allows you to create one Region of Interest
(ROI), also known as Area of Interest (AOI).
5.3.2 Horizontal and Vertical Window
Set the starting and ending point for each AOI independently in the horizontal direction
(Horizontal Window) and the vertical direction (Vertical Window) by setting the window
(H & V) offset and (H & V) size, as shown in the following figure. The minimum window
size is 320 (H) x 2 (V) pixel/line and the horizontal dimension is limited to multiples of 8
pixels. In normal operation, the AOI defines the number of columns and rows output.
However, you can apply subsampling and averaging modes to the AOI to reduce the
number of rows and columns output even further. Using the AOI function and
subsampling/averaging modes effectively increases the camera frame rate. The maximum
horizontal window size (H) and the vertical window size (V) are determined by the
camera’s
image full resolution, for example, 5120 x 5120 if using the C5180 camera.
