JPEG Decoder ⚡🔧

Accurate Edition — Range-Reduced Taylor Series + Hardened Pipeline

11-term Taylor cos/sin with angle reduction for double-precision accuracy

⏳ Compiling WASM...

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Drop a JPEG here or click to browse

Baseline JPEG — decoded with accuracy-hardened WebAssembly & 11-term Taylor series

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✅ Accuracy Fixes in This Version

🎯Range Reduction

Angles reduced to [-π, π] before Taylor series — fixes divergence for large inputs

📐11-Term Taylor Series

Both sin() and cos() use 11 terms with iterative computation for < 1e-15 error

🔄Proper Byte Stuffing

FF 00 → FF handling in entropy stream, restart markers (FFD0-FFD7) correctly skipped

🧮Correct Zigzag Order

Standard ITU-T T.81 zigzag table mapping from stream order to natural 8×8 order

📊Quantization Table Order

DQT entries stored in natural order after zigzag reordering, with 8/16-bit precision support

🎨BT.601 Color Conversion

Correct YCbCr→RGB with Cb/Cr centered at 128, proper coefficients (1.402, 0.344136, 0.714136, 1.772)

🔢DC Prediction Per-Component

DC predictors maintained per frame component index, reset at restart markers

📏Separable IDCT

Row-then-column decomposition for O(N³) with better numerical stability