JPEG 2000

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JPEG 2000

JPEG 2000 is an image compression standard and coding system. It was created by the Joint Photographic Experts Group committee in 2000 with the intention of superseding the original JPEG standard. Unlike the original JPEG, which uses the Discrete Cosine Transform (DCT), JPEG 2000 employs wavelet transforms for compression.

Features

JPEG 2000 offers several advantages over the original JPEG standard, including:

• **Superior Compression**: JPEG 2000 provides better image quality at the same file size or smaller file sizes for the same image quality.
• **Scalability**: The format supports both lossy and lossless compression, allowing for a wide range of quality and file size options.
• **Error Resilience**: JPEG 2000 includes mechanisms for error correction, making it more robust for transmission over unreliable networks.
• **Region of Interest Coding**: This feature allows certain parts of an image to be encoded with higher quality than others.
• **Progressive Transmission**: Images can be encoded in such a way that they can be progressively rendered, improving the user experience in web applications.

Technical Details

JPEG 2000 uses a wavelet transform to convert the image into a series of wavelet coefficients. These coefficients are then quantized and encoded using a variety of techniques, including arithmetic coding and bit-plane coding. The format supports multiple color spaces, including RGB, YCbCr, and CMYK.

Applications

JPEG 2000 is used in various fields, including:

• **Digital Cinema**: Due to its high quality and scalability, JPEG 2000 is used in digital cinema for movie distribution.
• **Medical Imaging**: The format's lossless compression is beneficial for medical imaging applications where image quality is critical.
• **Archiving**: Libraries and archives use JPEG 2000 for the long-term preservation of digital images.

Adoption and Support

Despite its advantages, JPEG 2000 has not seen widespread adoption. This is partly due to the computational complexity of the encoding and decoding processes, which require more processing power than the original JPEG. Additionally, the lack of native support in web browsers has limited its use on the internet.

Related Pages

• JPEG
• Wavelet Transform
• Discrete Cosine Transform
• Image Compression
• Digital Cinema
• Medical Imaging

See Also

• JPEG XR
• HEIF
• PNG
• GIF