Python 3.13.0 : Motion extraction from video with python programming.

... based on this video - Motion Extraction with python source code.

• 1. Temporal Displacement
  Let V(t) represent the video frame at the current time t.
  A secondary reference frame is generated at time t + Δt, where Δt is the defined time delay (shift).
• 2. Absolute Difference Calculation
  For every pixel coordinate (x, y), the algorithm calculates the absolute difference between the two points in time:
  D(x,y) = | V(x,y,t) - V(x,y,t + Δt) |
• 3. Result Interpretation
  • Static Areas: If the pixel value remains constant, the result is 0 (Black).
  • Motion: If the pixel value changes, the result is a positive integer > 0 (the "ghosting" trail).
• 4. Signal Amplification (Contrast)
  The raw difference values are multiplied by a constant factor k to make faint motion visible:
  Output(x,y) = D(x,y) × k