Your binary image should be 2 dimensional, if it is not convert the original image into gray cale and then create binary image,
midAirImage = imread("MidAirTest.jpg");
midAirImage = rgb2gray(midAirImage);
bwImage = imbinarize(midAirImage,'adaptive','ForegroundPolarity','dark','Sensitivity',0.4);
imshowpair(midAirImage, bwImage, 'montage')
imshow(bwImage);
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