Canny Edge Detection

An edge detection algorithm. Five steps => RGB to grayscale, noise removal, edge detection, edge thinning, and connect weak edges.

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OTSU Thresholding

An image binarization. Maximize between-class variance/Minimize within-class variance.

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8 Bit Plane Slicing

Slice grayscale image into 8 planes. 1st and 8th planes stand for low- and high-frequency signals, respectively.

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Linear Contrast Stretching

Make low-constrast image more clear.

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Morphological Processing

Be used to enhance features or texture of one image. Four major operations => dilation, erosion, opening (erosion then dilation), and closing (dilation then erosion).

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Image Scaling

Two common techniques => nearest neighbor interpolation (NNI) and bilinear interpolation (BI).

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XOR Encoding

key XOR secret = cipher, cipher XOR key = secret

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Pixelization


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Harris Corner Detector

A corner detection algorithm.

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Histogram Equalization

Non-linear contrast stretching. To equally make use of all available grayscales in the dynamic range.

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Alpha Blending

Blend two images into one resultant image by linear combination.

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Frosted Glass Effect


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Color Splitting Glitch Effect


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Oil Painting Effect


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Ordered Dithering

An image dithering algorithm, which is characterized by noticeable crosshatch patterns in the resultant image.

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ASCII Art

Use characters represent an image. Each character stands for one intensity. Thinnest character => lower intensity, boldest character => higher intensity (or thinnest => higher, boldest => lower).

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