System information (version)

• OpenCV => 4.5.5
• Operating System / Platform => Ubuntu 18.04
• Compiler => gcc 7.5

Detailed description

I build opencv.js with reduced opencv_js.config.py. The functions are very little, but the size is too big (> 1.6M). I add -DBUILD_opencv_video=OFF to build.js, but the size still big about 1.5M.
Any idea to reduce it to smaller?

core = {
    '': [
        'copyMakeBorder',  'divide', 'multiply', 'subtract',
    ],
}

imgproc = {
    '': [
        'cvtColor',
        'resize',
        'warpAffine',
        'warpPerspective',
    ],
}

dnn = {'': ['blobFromImage']}

white_list = makeWhiteList([core, imgproc, dnn])

Steps to reproduce

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues,
  forum.opencv.org, Stack Overflow, etc and have not found solution
• I updated to latest OpenCV version and the issue is still there
• There is reproducer code and related data files: videos, images, onnx, etc