Error using imaq.VideoDevice

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trk
trk 2021-12-29
评论： Walter Roberson 2023-2-8
Hello, I made such a code for my project, but
Error using imaq.internal.VideoDeviceInternalNo device is available at the specified DEVICEID. See IMAQHWINFO('winvideo').Error in imaq.VideoDevice
My camera: a4 tech pk-636k
I'm getting an error like this, if you can help I'd appreciate it.
%% Detecting Motions Using Gaussian Mixture MOdel
%
%
%
%https://ch.mathworks.com/help/vision/examples/detecting-cars-using-gaussian-mixture-models.html
%
%%
clear all; close all;
clc;
%%
FRAME_WIDTH = 1280;
FRAME_HEIGHT = 720;
vidDevice = imaq.VideoDevice('winvideo', 2, strcat('MJPG_',num2str(FRAME_WIDTH),'x',num2str(FRAME_HEIGHT)), ... % Acquire input video stream
'ROI', [1 1 FRAME_WIDTH FRAME_HEIGHT], ...
'ReturnedColorSpace', 'rgb');
foregroundDetector = vision.ForegroundDetector('NumGaussians', 3, ...
'NumTrainingFrames', 50);
blobAnalysis = vision.BlobAnalysis('BoundingBoxOutputPort', true, ...
'AreaOutputPort', false, 'CentroidOutputPort', false, ...
'MinimumBlobArea', 3500);
se = strel('square', 5); % morphological filter for noise removal
%% Train Foreground Detector
disp('Training');
for i = 1:150
disp(strcat('step#',num2str(i)));
frame = step(vidDevice); % read the next video frame
foreground = step(foregroundDetector, frame);
end
disp('Training Complete');
%%
for i=1:400
rgbFrame = step(vidDevice);
rgbFrame=flip(rgbFrame,2);
grayFrame = rgb2gray(rgbFrame);
grayFrame = imgaussfilt(grayFrame,4);
% Detect the foreground in the current video frame
foreground = step(foregroundDetector, rgbFrame);
% Use morphological opening to remove noise in the foreground
filteredForeground = imopen(foreground, se);
% Detect the connected components with the specified minimum area, and
% compute their bounding boxes
bbox = step(blobAnalysis, filteredForeground);
% Draw bounding boxes around the detected cars
result = insertShape(rgbFrame, 'Rectangle', bbox, 'Color', 'green','LineWidth', 5);
% Display the number of cars found in the video frame
numCars = size(bbox, 1);
result = insertText(result, [10 10], numCars, 'BoxOpacity', 1, ...
'FontSize', 14);
figure(5),imshow(result);
% step(videoPlayer, result); % display the results
end
%%
release(vidDevice)

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回答（3 个）

Image Analyst
Image Analyst 2021-12-29
What does this show fpr you?
>> imaqhwinfo
ans =
struct with fields:
InstalledAdaptors: {'gentl' 'lumeneraimaq' 'winvideo'}
MATLABVersion: '9.11 (R2021b)'
ToolboxName: 'Image Acquisition Toolbox'
ToolboxVersion: '6.5 (R2021b)'
  9 个评论
显示 7更早的评论
trk
trk 2022-1-3
Sir, it is giving an error again. I have one more question for you. There would be an article for Motion Detection that I can read, a resource I can use, for example, if you could give me advice on how it works, I would be very happy because this is my final project, but there is always a problem, I need to research thoroughly and for my presentation.
Image Analyst
Image Analyst 2022-1-3
I don't see a line number there. Tell the debugger to run but stop on any error and tell me what line number it is throwing the error on.

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yanqi liu
yanqi liu 2021-12-30
yes，sir，may be use
vidDevice = imaq.VideoDevice('winvideo', 1, strcat('MJPG_',num2str(FRAME_WIDTH),'x',num2str(FRAME_HEIGHT)), ... % Acquire input video stream
'ROI', [1 1 FRAME_WIDTH FRAME_HEIGHT], ...
'ReturnedColorSpace', 'rgb');
Pham
Pham 2023-2-8
Hello, I made such a code for my project, but
Error using imaq.internal.VideoDeviceInternal
Invalid VIDEOFORMAT 'YUY2_640x480' specified. VIDEOFORMAT must be specified as a string. The available
formats on this device are {RGB24_640x480}.
Error in imaq.VideoDevice
  1 个评论
Walter Roberson
Walter Roberson 2023-2-8
@Pham
What is your call to imaq.VideoDevice ?
What hardware (brand and model) of camera are you using?

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