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A monochrome bitmap compression method and system thereof

A compression method and bitmap technology, applied in image communication, digital video signal modification, electrical components, etc., can solve problems such as unreachable compression rate, slow interface refresh, serious resource consumption of central processing module, etc., to improve refresh rate Frequency, the effect of reducing time consumption

Active Publication Date: 2015-10-14
HUIZHOU DESAY SV AUTOMOTIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing image compression algorithms are relatively complex, and in embedded systems, due to the limitation of the performance of single-chip microcomputers, most of the complex compression algorithms are not suitable for operation, and simple algorithms generally cannot achieve good compression ratios. Little improvement for data transfer
Embedded system data compression is difficult or the compression effect is not good, resulting in slow interface refresh, serious resource consumption of the central processing module, and even affecting the performance of the whole machine

Method used

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  • A monochrome bitmap compression method and system thereof
  • A monochrome bitmap compression method and system thereof
  • A monochrome bitmap compression method and system thereof

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] Existing BI_RLE8 compression algorithm

[0038] This compression method is adopted in bitmap files of WINDOWS3.0 and 3.1. The encoding of this compression method takes 2 bytes as the basic unit. Among them, byte1 specifies the number of color repetitions specified by byte2. For example, the code 0x0504 means to continuously display 5 pixels with a color value of 0x04 starting from the current position.

[0039] Algorithms derived from BI_RLE8

[0040] The BI_RLE8 compression algorithm is suitable for the compression of 256-color bitmaps. When its algorithm idea is applied to monochrome bitmaps, the algorithm description derived from BI_RLE8 can be obtained:

[0041] By scanning the data bit by bit, the repeated data is described by a word (2byte). Bit15 indicates whether the compression is continuous 1 or continuous 0, and ...

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Abstract

The invention relates to the related technical field of compression methods, in particular to a compression method for a monochrome bitmap and a system thereof. The monochrome bitmap is expressed by adopting binary data. The method comprises the following steps of: scanning data of one monochrome bitmap; and when encountering continuation 1 exceeding a preset first threshold value or continuation 0 exceeding the preset first threshold value, carrying out a compression step for generating compressed data, or else carrying out an uncompression step for generating uncompressed data. The compression algorithm provided by the invention has obvious effect for reducing time consumption generated by overall display data transmission of a mainboard central processing singlechip, so that the refreshing frequency of an interface of a navigator can be improved, and more fluent feeling is brought for clients.

Description

technical field [0001] The invention relates to the technical field related to compression methods, in particular to a monochrome bitmap compression method and system thereof. Background technique [0002] The car multimedia entertainment system is mainly composed of a host (CD player), a separate display screen, a separate keypad, and a steering wheel controller. The host transmits display data to the separate display screen through CGI communication. [0003] The existing multifunctional navigation host can directly replace the separate display screen, and can realize all the display functions of the original car separate display screen. [0004] However, the display data actually sent by the car's CD player is BMP monochrome bitmap data of 256*76 pixels, and each frame of image is 2432 bytes, which communicates through a 625Kbps common gateway interface (CGI, CAN Graphic Interface) at a cycle of 70ms mode is sent to the display. For the multifunctional navigation host,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/20H04N19/186H04N19/42
Inventor 张皓麦志伟
Owner HUIZHOU DESAY SV AUTOMOTIVE