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Extraction and analysis method for sound groove track of old record

An analysis method and technology of sound groove, applied in image analysis, image enhancement, instruments, etc., can solve problems such as difficult implementation, relatively high requirements for equipment experiments and working environment

Active Publication Date: 2021-02-02
ZHONGKE HUIJIN DIGITAL TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on the non-destructive preservation of existing old record audio cultural relics is still in the early stage. Research on non-contact cartridges using infrared and laser scanning has been carried out at home and abroad. However, this kind of technology has relatively high requirements for equipment, experiments and working environment, and it is difficult to realize. bigger

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  • Extraction and analysis method for sound groove track of old record
  • Extraction and analysis method for sound groove track of old record
  • Extraction and analysis method for sound groove track of old record

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Experimental program
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Embodiment Construction

[0026] The proposed method mainly includes: grayscale, grayscale equalization, track extraction of sound groove, and simple encoding transformation of track information and audio map. include:

[0027] 1. Grayscale

[0028] The method proposed in this patent first converts an input color scanned document image into a grayscale image. Firstly, judge the image type of the input scanned document. If it is a grayscale image, go directly to the next step; if it is a color image, use the following process to convert to a grayscale image.

[0029] Use C to represent the input color scanned document image, and its red, green, and blue three-channel images are respectively represented by C R 、C G and C B express. Use formula (1) to get the grayscale image, and express it with L, that is:

[0030]

[0031] 2 Histogram equalization

[0032] Due to factors such as lighting and microscopic imaging equipment, the brightness of the scanned image of the sound groove of an old recor...

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Abstract

The invention discloses an extraction and analysis method for a sound groove track of an old record. The method comprises the following steps: converting an input old record scanning image into a graylevel image L; performing histogram equalization on the L, performing equalizing, and representing an result by I; extracting a sound groove track of the image I, and observing the image, wherein thesound groove track is a brighter area, deviating from the center line, of the sound groove outline; and after the sound groove track is extracted, simply coding and converting the track information and audio spectrum. According to the method, digital storage of the old record audios can be safely and efficiently achieved, and compared with other old record audio digitizing methods, the method islow in difficulty and does not damage old record cultural relics.

Description

technical field [0001] The invention relates to a method for extracting and analyzing sound groove tracks of old discs, in particular to grayscale, binarization and denoising techniques for scanned images of sound groove tracks. The scanned image of the groove is unfolded into an easy-to-observe planar image with position coordinates. The image is a strip of different brightness Background technique [0002] Records are the first mature and large-scale sound preservation carrier in human history. The principle of the old-fashioned record is to convert the sound signal into mechanical vibration through the modulation device, and record the mechanical vibration signal on the track of the disc-type bakelite record (compact record). audio signal carried. When the old record is playing audio, the probe travels on the old record according to the track of the sound groove, and converts the generated mechanical vibration into an electrical signal, and then passes through a series...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/40
CPCG06T5/40G06T2207/30241G06T5/90G06T5/70
Inventor 熊志远王学民刘京龙孙莹莹胡凤营
Owner ZHONGKE HUIJIN DIGITAL TECH BEIJING