CNN Convolutional Filters

Edge detection · Sobel · Laplacian · Gaussian blur · feature maps · receptive field

Kernel (3×3)

Source Image

Sobel X (horizontal edges)

Receptive Field Scan

Scene: Geometric

Scan Position: center

Convolution: each output pixel = sum of elementwise product of kernel × local input patch. Stride and padding control output size. Multiple learned filters → feature maps. Pooling adds translation invariance.