Round 1/6Score: 0
Pixel Filter Lab
Change a grid, predict its processed pixels and check your calculation.
Processed grid
Live result
Tap or focus any cell to read its value. Pink outline marks the question cell.
Pixel-level histogram
Concept: pixels form a grid
A threshold classifies values; a filter combines neighbouring pixels.
Your controls
First try: 100 points
Round information
The maths
Threshold: output = 1 when pixel ≥ T; otherwise 0.
True convolution: output(y,x) = sum of input(y+i,x+j) times the kernel flipped in both directions.
Block downsampling: new pixel = sum of block values divided by the number of pixels. New pixel width = old width × block factor.
Assumption: pixels are uniformly spaced; block averages represent each output pixel.