How to update the available Frame Rate range when change camera ROI using IMAQ Toolbox?

Question

Kun Xie 2018-4-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/398031-how-to-update-the-available-frame-rate-range-when-change-camera-roi-using-imaq-toolbox

编辑： Sarang Kunte 2018-5-5

Hi, I'm using IMAQ Toolbox with a PointGrey Chameleon CM3-U3-28S4M camera. This camera could achieve higher frame rate with a smaller region of interest (ROI), e.g. 13 fps at 1928×1448 px (full size), 25 fps at 1000*600 px.

In the FlyCaptureViewer ( provided by the manufacturer PointGrey), available frame rate range changed automatically just after I set the ROI.

In MATLAB, I can get the frame rate range with

propinfo(vid,'FrameRate')

However, When I run this function after I set a small ROI, it still return the original frame rate at full size ROI. It seems that propinfo doesn't query camera to update the new frame rate range.

>>propinfo(vis,'FrameRate')           % Get frame rate range at full ROI
set(vid,'ROIPosition',[0 0 100 100]); % Set small ROI
propinfo(vis,'FrameRate')             % Get frame rate range at small ROI
ans = 
包含以下字段的 struct:
               Type: 'double'
         Constraint: 'bounded'
    ConstraintValue: [6.2473 41.2843]
       DefaultValue: 41.2806
           ReadOnly: 'whileRunning'
     DeviceSpecific: 1
         Accessible: 1
ans = 
  包含以下字段的 struct:
               Type: 'double'
         Constraint: 'bounded'
    ConstraintValue: [6.2473 41.2843]
       DefaultValue: 41.2806
           ReadOnly: 'whileRunning'
     DeviceSpecific: 1
         Accessible: 1