Method for measuring image transmission time delay

A technology for transmitting time delay and measuring images, applied in image communication, pulse modulation TV signal transmission, television, etc., can solve problems such as large measurement error, inaccurate measurement time delay, and no method for delay measurement, and achieve The effect of reducing computational complexity, strong versatility, and reducing image matching time

Active Publication Date: 2010-03-10
SPACE STAR TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent does not give a fine delay measurement method
The delay length obtained according to the number of delay frames is affected by the transmission frame rate of the image, and there will be a large measurement error (

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  • Method for measuring image transmission time delay
  • Method for measuring image transmission time delay

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Embodiment 1

[0025] In this embodiment, a PC is used to sample and test the image time delay data that has been compressed, transmitted and decompressed by the device. The method will be further described below with reference to the actual device.

[0026] (1) After the source image sequence to be measured is transmitted, a time-delay image sequence is generated;

[0027] The apparatus uses an image sequence generating device 11 as an image source, which may be a camera or a DVD player. The source image sequence generated by the image sequence generation device 11 is respectively input to an input end of the image compression device 12 and the time delay calculation PC 15; Compressed image sequence signal. After the compressed image sequence signal is transmitted 13, the image decompression device 14 decompresses the received compressed image sequence data to obtain a time-delayed image sequence, which is output to the time-delay calculation PC 15 through the output interface.

[0028] T...

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Abstract

The invention discloses a method for measuring image transmission time delay, comprising the steps: (1) generating a time delay image sequence after a source image sequence to be measured is transmitted; (2) collecting the source image sequence and the time delay image sequence; recording the collecting time of each frame image of the source image sequence and the time delay image sequence in collection; respectively buffering each frame image of the collected source image sequence and the time delay image sequence; (3) matching each frame image in the buffered source image sequence with the buffered images in the time delay image sequence to obtain the best matching images; (4) subtracting the collecting time of the best matching images from the collecting time of the frame image in the source image sequence to obtain the transmission time delay of the frame image; (5) taking another frame image from the buffered source image sequence; repeating step (3) and (4); computing the transmission time delay of the frame image and (6) repeating step (5) and computing the average value of the obtained transmission time delay values as the transmission time delay of the image to be measured.

Description

technical field [0001] The invention relates to a method for measuring image transmission time delay, belonging to the technical field of digital image processing. Background technique [0002] After the image is transmitted through a wired or wireless network, a certain delay is often caused. Taking a digital image as an example, after the digital image is compressed, transmitted, and decompressed, when the image quality changes, this process will generate a certain amount of time delay. In order to measure the amount of delay, there are generally the following methods: [0003] 1. Use an oscilloscope to compare the electrical signals of the original image and the transmitted image, and measure the time delay between the two by measuring the group delay; [0004] 2. For digital image signals, acquired by marking a specific image sequence [0005] Chinese patent application number: 200510130084, title: A method and device for testing image time delay, the time delay exper...

Claims

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Application Information

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IPC IPC(8): H04N17/00H04N7/24
Inventor 尚书林国辉王猛李林琳
Owner SPACE STAR TECH CO LTD
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