如何从MATLAB存储的设备控制的存储器中使用ActiveX控制的数据

Question

我有一个USB摄像头（DCC1645），我试图通过MATLAB进行接口。我已经成功它连接到它通过ActiveX：

cam = actxcontrol('uc480.uc480Ctrl.1'); 

，我可以在它上面运行等多种功能，我现在想知道如何获取图像数据;相关函数返回一个指针到图像存储：

GetImageMem() returns the pointer to the internal image memory where the image is stored. 

所以如果我运行

loc = cam.GetImageMem(); 

然后loc是代表内存位置的一些大数目。它得到了多少内存存储的功能如下：

InquireImageMem(LONG* nWidth, LONG* nHeight, LONG*nBits, LONG* nPitch) 
reads the properties of the allocated image memory. The function returns 
the properties of the actual image buffer, as returned by GetImageMem 

nWidth  Receives the width of the allocated image memory. 
nHeight Receives the height of the allocated image memory. 
nBits  Receives the bits per pixel of the allocated image memory. 
nPitch  Receives the pitch of the allocated image memory. The pitch 
      is the number of bytes from the start of a line to the start 
      of the next line. 

所以我的问题是双重的：

1. 你如何给一个指针的内存和大小的实际数据？
2. 如何传递函数的引用（例如LONG * nwidth）？有没有像我应该使用libpointer的东西？

谢谢！

Answer 1

1）简短的答案是“否”，即使你知道它在哪里以及它有多大，你也不能在MATLAB中将内存拉出内存。但是，此特定相机由Image Acquisition toolbox支持，并附有相关教程here。

长的答案是，如果你用一些mex/c补充你的MATLAB代码，你可以使它工作，虽然我没有任何细节。

2）正如我在评论中写道原来的问题，

[a,b,c,d] = cam.InquireImageMem(0,0,0,0); 

会工作。使用cam.methods('-full')可以获得库中所有可能方法的列表及其所需的输入/输出。

Answer 2

尝试使用的uEye .NET用户层 http://en.ids-imaging.com/manuals/uEye_SDK/EN/uEye_DotNET_Manual/index.html?ueyeinstallation.htm

下面是一些例子MATLAB代码

---

clear all 

close all 

computer_type=computer; 

if strcmp (computer_type,'PCWIN64') 

NET.addAssembly('C:\Program Files\IDS\uEye\Develop\DotNet\x64\uEyeDotNetUserLayer.dll'); 

NET.addAssembly('C:\Program Files\IDS\uEye\Develop\DotNet\x64\uEyeDotNetApiLayer.dll'); 

elseif strcmp (computer_type,'PCWIN') 

NET.addAssembly('C:\Program Files\IDS\uEye\Develop\DotNet\x86\uEyeDotNetUserLayer.dll'); 

NET.addAssembly('C:\Program Files\IDS\uEye\Develop\DotNet\x86\uEyeDotNetApiLayer.dll'); 

end 

cam = uEye.Camera; 

cam.Exit(); 

CAM_ID=2; 

exposure_ms=2; 

cam.Init(CAM_ID); 

ColorMode=uEye.Defines.ColorMode.SENSOR_RAW8; 

cam.PixelFormat.Set(11); 

cam.Trigger.Set(uEye.Defines.TriggerMode.Software); 

[tmp, memId] = cam.Memory.Allocate(true); 

[tmp, imgWidth] = cam.Memory.GetWidth(memId); 

[tmp, imgHeight] = cam.Memory.GetHeight(memId); 

[tmp, imgBpp] = cam.Memory.GetBitsPerPixel(memId); 

imgBpp = imgBpp/8; 

imgSize = imgWidth * imgHeight * imgBpp; 

bufArr = NET.createArray('System.Byte', imgSize); 

soft = uEye.Software(CAM_ID); 

soft.SetEnableAutoWhiteBalance(false); 

soft.SetEnableAutoGain(false); 

soft.SetEnableAutoShutter(false); 

cam.Timing.Exposure.Set(exposure_ms); % msec 

cam.Acquisition.Freeze(1); 

[tmp, camMemPtr] = cam.Memory.ToIntPtr; 

System.Runtime.InteropServices.Marshal.Copy(camMemPtr, bufArr, 0, imgSize); 

img = uint8(bufArr); 

myImage=reshape(img, imgWidth, imgHeight)'; 

Answer 3

根据IDS的COM框架不再支持，所以你应该考虑切换到NET框架。我认为lunarquaker的这篇文章指的是旧版本。这里是一个代码片段，如果复制并粘贴到Matlab应该没有修改相机型号＃UI-1220SE-M-GL（它对我来说）。您可以更改彩色相机的像素格式。

在Matlab 8.3.0.532（R2014a）测试，uEyeDotNet版本= 1.5.3.0和IDS /的uEye v4.40.0.0

注意 - 你必须尝试再次初始化同一个镜头前 “退出”否则你会发现自己处于一个麻烦的世界。

% Add NET assembly if it does not exist 
% May need to change specific location of library 
asm = System.AppDomain.CurrentDomain.GetAssemblies; 
if ~any(arrayfun(@(n) strncmpi(char(asm.Get(n-1).FullName), ... 
     'uEyeDotNet', length('uEyeDotNet')), 1:asm.Length)) 
    NET.addAssembly(... 
     'C:\Program Files\IDS\uEye\Develop\DotNet\signed\uEyeDotNet.dll'); 
end 

% Create camera object handle 
cam = uEye.Camera; 

% Open 1st available camera 
% Returns if unsuccessful 
if ~strcmp(char(cam.Init), 'SUCCESS') 
    error('Could not initialize camera'); 
end 

% Set colormode to 8-bit RAW 
if ~strcmp(char(cam.PixelFormat.Set(uEye.Defines.ColorMode.SensorRaw8)), ... 
     'SUCCESS') 
    error('Could not set pixel format'); 
end 

% Set trigger mode to software (single image acquisition) 
if ~strcmp(char(cam.Trigger.Set(uEye.Defines.TriggerMode.Software)), 'SUCCESS') 
    error('Could not set trigger format'); 
end 

% Allocate image memory 
[ErrChk, img.ID] = cam.Memory.Allocate(true); 
if ~strcmp(char(ErrChk), 'SUCCESS') 
    error('Could not allocate memory'); 
end 

% Obtain image information 
[ErrChk, img.Width, img.Height, img.Bits, img.Pitch] ... 
    = cam.Memory.Inquire(img.ID); 
if ~strcmp(char(ErrChk), 'SUCCESS') 
    error('Could not get image information'); 
end 

% Acquire image 
if ~strcmp(char(cam.Acquisition.Freeze(true)), 'SUCCESS') 
    error('Could not acquire image'); 
end 

% Extract image 
[ErrChk, tmp] = cam.Memory.CopyToArray(img.ID); 
if ~strcmp(char(ErrChk), 'SUCCESS') 
    error('Could not obtain image data'); 
end 

% Reshape image 
img.Data = reshape(uint8(tmp), [img.Width, img.Height, img.Bits/8]); 

% Draw image 
himg = imshow(img.Data, 'Border', 'tight'); 

% Acquire & draw 100 times 
for n=1:100 
    % Acquire image 
    if ~strcmp(char(cam.Acquisition.Freeze(true)), 'SUCCESS') 
     error('Could not acquire image'); 
    end 

    % Extract image 
    [ErrChk, tmp] = cam.Memory.CopyToArray(img.ID); 
    if ~strcmp(char(ErrChk), 'SUCCESS') 
     error('Could not obtain image data'); 
    end 

    % Reshape image 
    img.Data = reshape(uint8(tmp), [img.Width, img.Height, img.Bits/8]); 

    % Draw image 
    set(himg, 'CData', img.Data); 
    drawnow; 
end 


% Close camera 
if ~strcmp(char(cam.Exit), 'SUCCESS') 
    error('Could not close camera'); 
end