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What is JPEG Compression and DCT Explained about?
The JPEG standard uses discrete cosine transform (DCT) to compress images. It divides images into 8x8 pixel blocks and applies DCT, quantizing the coefficients to ignore high frequency components. This compresses the data by prioritizing low frequency DCT coefficients. DCT is preferred over discrete Fourier transform (DFT) for image compression as it concentrates the image energy in fewer coefficients, allowing more coefficients to be quantized to zero for greater data compression at similar quality levels.
- Author
- Taxi Driver
- Language
- EN