Difference: JPEG2000 is an upgraded version of JPEG, and its compression rate is about 30% higher than JPEG. JPEG2000 uses wavelet transform and efficient data organization method EB-COT to replace 8X8DCT, and uses arithmetic coding, which improves the coding performance by about 2dB compared to JPEG under the same compression ratio.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
JPEG2000 is an upgraded version of JPEG. Its compression rate is about 30% higher than JPEG, and it supports both lossy and lossless compression. An extremely important feature of the JPEG2000 format is that it can achieve progressive transmission, that is, first transmit the outline of the image, and then gradually transmit the data, continuously improving the image quality, allowing the image to be displayed from hazy to clear. JPEG2000 can be used in traditional JPEG markets, such as scanners, digital cameras, etc., and can also be used in emerging fields, such as network transmission, wireless communications, etc.
JPEG 2000 is an image compression standard based on wavelet transform, created and maintained by the Joint Photographic Experts Group. JPEG 2000 is generally considered to be the next-generation image compression standard that will replace JPEG (based on discrete cosine transform) in the future. The file extension for JPEG 2000 files is usually . jp2, the MIME type is image/jp2. JPEG2000 has a higher compression ratio and does not produce the blocky blur artifacts caused by the original discrete cosine transform-based JPEG standard. JPEG2000 supports both lossy and lossless compression. In addition, JPEG2000 also supports more complex progressive display and downloading.
The difference between JPEG2000 and JPEG
1) Efficient encoding method. JPEG2000 uses wavelet transform and efficient data organization method EB-COT to replace 8X8DCT, and uses arithmetic coding, which improves the coding performance by about 2dB compared with JPEG under the same compression ratio;
2) ROI coding. In some applications, a certain area of the image has higher importance than other areas (background). This important area is often called the area of interest. JPEG2000 supports encoding of ROI with higher quality than scene;
3) Scalable encoding. JPEG2000 supports spatial resolution scalability and signal-to-noise ratio scalability coding similar to a layered approach. The latter means that truncation can be made at different points of the encoded stream to obtain reconstructed images with different signal-to-noise ratios.
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