Unverified50% confidenceFactExact time
2D-DCT is the two-dimensional discrete cosine transform, widely used in image compression standards such as JPEG; using DCT basis as measurement patterns is a common choice in single-pixel imaging because natural image energy is highly concentrated in the DCT domain.
1
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50%
Confidence
Long-term
Relevance
11/4/2026
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Related Claims
UnverifiedJPEG image compression uses the Discrete Cosine Transform (DCT) to decompose 8×8 pixel blocks into spatial frequency components and then quantizes and discards the high-frequency coefficients.67% similarUnverifiedH.264 uses an integer DCT transform to concentrate residual energy into low-frequency coefficients, and the quantization step discards high-frequency information that the human eye is insensitive to.63% similarUnverifiedThe original DDPM uses a linear β_t schedule, and later work (such as Nichol & Dhariwal) proposed a cosine schedule that makes the decay of ᾱ_t smoother and performs more stably on both low-resolution and high-resolution images.60% similar
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