Capture image using GPIB on Infiniium DCA86100 Oscilloscope

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Peter 2018-11-24

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https://ww2.mathworks.cn/matlabcentral/answers/431727-capture-image-using-gpib-on-infiniium-dca86100-oscilloscope

编辑： Andrew Borghesani 2018-11-27

I want to capture the screen of the Infiniium DCA86100 oscilloscope using the GPIB interface.

The command that I am using is " :DISPLAY:DATA? JPEG " . When I query this command I only receive something lke this "#6188443ÿØÿà".

I though this shouldn't be the data for an entire image so I changed the input buffer size to a very large value but I still get something similar and of the same order every time I try.

Also how will I able to retrieve the actual image from this data?

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Answer 1

Andrew Borghesani 2018-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/431727-capture-image-using-gpib-on-infiniium-dca86100-oscilloscope#answer_349254

编辑：Andrew Borghesani 2018-11-27

在 MATLAB Online 中打开

After playing around with it a little, I was able to get a color image (although in a bitmap not JPEG) doing the following, where visaObj is an open visa connection rather than a GPIB. The SCPI commands and rest of the workflow should be the same though

% send command and get BMP.
fprintf(visaObj,':DISPLAY:DATA? BMP, COLOR');
screenBMP = binblockread(visaObj,'uint8');
fread(visaObj,1);
% save as a BMP  file
fid = fopen('test1.bmp','w');
fwrite(fid,screenBMP,'uint8');
fclose(fid);
% Read the BMP and display image
figure;
imageMatrix = imread('test1.bmp','bmp');
image(imageMatrix); 
% Adjust the figure so it shows accurately
sizeImg = size(imageMatrix);
set(gca,'Position',[0 0 1 1],'XTick' ,[],'YTick',[]); set(gcf,'Position',[50 50 sizeImg(2) sizeImg(1)]);
axis off; axis image;