op absdiff

FireSight wrapper for OpenCV absdiff, which takes the per-channel absolute difference of two images. FireSight stage compares specified image with current pipeline image and changes output to the absolute difference of the two.

• path Path to second image

Stage Model

The absdiff.json pipeline has two stages. The first stage computes the absdiff. The second stage adds the [histogram](op calcHist) of the absdiff image to the model. For example, if we compare identical 200x800 images, we would expect to see a histogram showing that all pixels are 0:

{
  "FireSight":{
    "version":"0.8.5",
    "url":"https://github.com/firepick1/FireSight"
  },
  "s1":{},
  "s2":{
    "hist":{
      "0":[
        160000,
        160000,
        160000
      ]
    }
  }
}

Example: Not all green pipeline

firesight -i img/pcb.jpg -p json/absdiff.json -Dimg=img/mog2.jpg -o target/absdiff.png

Pixel:4ms

The pipeline image →

The comparison image →

Note that the absolute difference of the two is not all green even though the only "difference" between the two images is that one has green text.

See Also

• op normalize
• op threshold