Encoder for volume data
First Claim
1. A volume data encoder for encoding volume data that are image data having a three-dimensional spatial pixel arrangement, the volume data encoder comprising:
- a two-dimensional transform unit for conducting two-dimensional frequency decomposition on two-dimensional consecutive images;
skip detection means for detecting the same data portion which can be skipped in the frequency decomposition and encoding processing, when further conducting one-dimensional frequency decomposition and subsequent encoding processing on transform coefficients obtained from the two-dimensional transform unit;
a one-dimensional transform unit for conducting the one-dimensional frequency decomposition except the portion detected by the skip detection means which can be skipped; and
an encoding processing unit for conducting encoding on data subjected to the frequency decomposition in the one-dimensional transform unit, except the portion which can be skipped.
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Abstract
A volume data encoder with high encoding efficiency is provided. The object of the coding is volume data which contains a plurality of tomogram planes output from a CT and an MRI. A header analysis unit separates each plane image into header information and pixel information. A header compression unit compresses the separated header information. On the other hand, a two-dimensional transform unit conducts frequency decomposition on the pixel information. A skip portion detection and table generation unit detects skip portions that are the same in all coefficients in a z-direction, and stores them in a table. A one-dimensional transform unit conducts one-dimensional transform on the pixel information for coefficients except the skip portions. A unit block division unit divides each subband into unit blocks. An entropy encoding unit determines a parameter for entropy encoding according to statistical properties of all coefficients in all unit blocks included in each class.
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Citations
10 Claims
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1. A volume data encoder for encoding volume data that are image data having a three-dimensional spatial pixel arrangement, the volume data encoder comprising:
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a two-dimensional transform unit for conducting two-dimensional frequency decomposition on two-dimensional consecutive images;
skip detection means for detecting the same data portion which can be skipped in the frequency decomposition and encoding processing, when further conducting one-dimensional frequency decomposition and subsequent encoding processing on transform coefficients obtained from the two-dimensional transform unit;
a one-dimensional transform unit for conducting the one-dimensional frequency decomposition except the portion detected by the skip detection means which can be skipped; and
an encoding processing unit for conducting encoding on data subjected to the frequency decomposition in the one-dimensional transform unit, except the portion which can be skipped. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification