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Image compression method and device

An image compression and image technology, applied in the field of image processing, can solve problems such as image quality reduction, and achieve the effect of visual quality reduction

Active Publication Date: 2017-04-12
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce transmission time and / or reduce memory requirements, users usually choose higher compression ratios, but higher compression ratios will result in lower image quality

Method used

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  • Image compression method and device
  • Image compression method and device
  • Image compression method and device

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Embodiment Construction

[0013] Features and exemplary embodiments of various aspects of the invention will be described in detail below. The following description covers numerous specific details in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a clearer understanding of the present invention by showing examples of the present invention. The present invention is by no means limited to any specific configuration and algorithm presented below, but covers any modification, replacement and improvement of related elements, components and algorithms without departing from the spirit of the present invention.

[0014] Typically, 24 bits can be used to describe each pixel in a high-quality digital color image. Wherein, in the three primary color spaces, 8 bits can be used to describe ...

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Abstract

The invention discloses a method and a device for compressing an image. The method for compressing the image comprises the steps of mapping a pixel value of a first length of the current pixel to a pixel value of a second length; a pixel value of a second length of a previous pixel is subtracted from the pixel value of the second length of the current pixel to obtain a pixel difference value of the current pixel and the previous pixel, and acquiring the lengthening coding length corresponding to the pixel difference value under the condition of carrying out lengthening coding on the pixel difference value; and selecting to carry out fixed length coding on the pixel value of the second length of the current pixel directly if the lengthening coding length corresponding to the pixel difference value is greater than the fixed length coding length corresponding to the current pixel under the condition of carrying out lengthening coding on the pixel value of the second length of the current pixel, and if not, selecting to carry out lengthening coding on the pixel difference value.

Description

technical field [0001] The present invention relates to the field of image processing, in particular to an image compression method and device. Background technique [0002] The definition of digital video and digital image is getting higher and higher, and the frame rate of digital video is also increasing, so that the size of data processed in the digital video / image system becomes larger and larger. Digital video / imaging systems must handle large amounts of data, so the required memory size and bandwidth increase. [0003] Inserting an embedded compression codec between a functional module and a memory module in a digital video / image system or between a functional module in a digital video / image system and an external memory is very useful for reducing memory size and memory bandwidth. With the embedded compression codec inserted, the raw data is compressed before being transferred to memory, and the compressed data is decompressed before being processed by the processin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N11/02
Inventor 王争
Owner FUJITSU LTD
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