2

我有一个 USB 摄像头 ( DCC1645 )，我试图通过 MATLAB 与之交互。我已通过 ActiveX 成功将其连接到它：

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

我可以在上面运行各种功能等等。我现在想知道如何检索图像数据；相关函数返回一个指向内存中图像的指针：

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

所以如果我跑

loc = cam.GetImageMem();

然后loc是一些代表内存位置的大数字。获取存储多少内存的函数如下：

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.

所以我的问题有两个：

  1. 给定内存指针和大小，如何获取实际数据？
  2. 如何传递对函数的引用（例如 LONG* nwidth）？我应该使用像 libpointer 这样的东西吗？

谢谢！

4

3 回答 3

2

根据 IDS 的说法，COM 框架不再受支持，因此您应该考虑切换到 NET 框架。我认为来自 lunarquaker 的帖子指的是旧版本。这是一个代码片段，如果将其复制并粘贴到 Matlab 中，则无需修改相机型号即可使用 #UI-1220SE-M-GL（它适用于我）。您可以更改彩色相机的像素格式。

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

注意- 在尝试再次初始化同一台相机之前，您必须“退出”，否则您会发现自己陷入了麻烦之中。

%   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
于 2014-07-24T15:19:46.290 回答
1

1) 简短的回答是“不”，即使您知道矩阵在哪里以及它有多大，您也无法在 MATLAB 中将矩阵从内存中拉出来。但是，图像采集工具箱支持此特定相机，此处提供相关教程。

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

2）正如我在对原始问题的评论中所写，

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

将工作。用于cam.methods('-full')获取库中所有可能方法的列表，以及它们所需的输入/输出。

于 2012-08-16T21:51:38.470 回答
1

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

下面是一些示例 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)';
于 2013-04-21T05:50:56.417 回答