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Compression of high bit-depth images

An image, high-level technology, applied in the field of image processing

Inactive Publication Date: 2013-01-02
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] One limitation of the JPEG compression method is that the compression method is only limited to images with up to twelve (12) bits per color component

Method used

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  • Compression of high bit-depth images
  • Compression of high bit-depth images
  • Compression of high bit-depth images

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Embodiment Construction

[0059] Where reference is made to steps and / or features with the same reference numerals in any one or more of the figures, those steps and / or features have the same reference number for the present description, unless an intention to the contrary appears. function or operation.

[0060] As mentioned above, one limitation of the JPEG compression method is that it is only limited to images with up to twelve (12) bits per color component. The JPEG compression method can be extended to include images of sixteen (16) bits or higher. In particular, the JPEG compression method can be extended in conjunction with the above-described afterimage method by splitting a high bit-depth image into two or more JPEG-compatible lower bit-depth images. The low bit depth images can then be JPEG encoded separately. Such a section contains a preimage and one or more afterimages. However, afterimages of high bit depth images are generally noisy and therefore not suitable for JPEG compression.

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Abstract

The invention discloses compression of high bit-depth images. A method of storing an image is disclosed. A frequency-domain representation of the image is received, the frequency-domain representation having a plurality of bit-planes. The frequency-domain representation is divided into a first set of bit-planes and a second set of bit-planes, the first set of bit-planes being a higher set of bit-planes than the second set of bit-planes. The first set of bit-planes and the second set of bit-planes is partitioned into a plurality of partitions. At least one partition from the second set of bit-planes is inserted into the plurality of partitions of the first set of bit-planes to produce a plurality of arranged partitions of the image. The arranged partitions of the image are stored.

Description

technical field [0001] The present invention relates to image processing and, in particular, to methods and apparatus for storing bitmap images. The invention also relates to a computer program product comprising a computer readable medium on which is recorded a computer program for storing bitmap images. Background technique [0002] Current bitmap images are typically encoded with eight (8) bits per color channel. In this case, a total of two hundred and fifty-six (256) shades of color may be present for a particular color channel. Generally, two hundred and fifty-six (256) shades per channel are sufficient for many photographic, display and printing needs. [0003] However, with the increased use of high bit depth medical images, graphics displays, and large format printers, there is a need for methods of encoding images with sixteen (16) bits per color channel to provide finer color gradient levels within a particular color channel. Since the human eye is able to dist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/804
CPCH04N7/26351H04N7/3016H04N19/00442H04N7/26196H04N19/00333H04N19/00296H04N19/002H04N19/00812H04N7/3072H04N19/1883H04N19/154H04N19/18H04N19/34H04N19/625
Inventor 刘强D・R・J・莫纳格汉D・D・S・邓
Owner CANON KK
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