CN109327700B - SEI transmission-based image coding and decoding time delay testing method - Google Patents
SEI transmission-based image coding and decoding time delay testing method Download PDFInfo
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- CN109327700B CN109327700B CN201811403209.7A CN201811403209A CN109327700B CN 109327700 B CN109327700 B CN 109327700B CN 201811403209 A CN201811403209 A CN 201811403209A CN 109327700 B CN109327700 B CN 109327700B
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
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- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
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Abstract
The invention discloses an SEI transmission-based image coding and decoding time delay testing method, which comprises the following steps of: (1) an encoder acquisition module writes a time delay identification in an image after detecting a first line of an input image, and outputs a time delay test pulse at the same time; (2) before coding, the coder coding module extracts a time delay measurement identifier and writes the time delay measurement identifier into an SEI field of a compressed code stream; (3) before decoding, the decoder extracts a time delay identification from the code stream and outputs a time delay pulse while decompressing the image display; (4) and simultaneously measuring the two pulses by using an oscilloscope to acquire time delay information. The time delay testing method of the image coding and decoding system, which is realized by adopting the invention, has extremely high precision, simple operation and easy realization, and provides possibility for the development, debugging and testing of the low time delay image coding and decoding system.
Description
Technical Field
The invention belongs to the technical field of image coding and decoding, and particularly relates to a time delay testing method for image coding and decoding.
Background
The image coding and decoding system is an important component of an unmanned aerial vehicle data link transmission system, image coding and decoding and transmission delay are one of key indexes of a human-in-loop control system of the unmanned aerial vehicle, and if the delay does not meet the requirement of a design index, on one hand, the accuracy of an operator on task load control is influenced, and targets are difficult to capture and track; on the other hand, the accuracy of the control of the aircraft by the operator is influenced, and particularly the flight safety is influenced in the takeoff and landing stage. Therefore, the image coding and decoding time delay needs to be accurately tested in the design stage.
Disclosure of Invention
The invention provides an SEI transmission-based image coding and decoding time delay test method to finish image coding and decoding time delay test.
The technical scheme adopted by the invention is as follows:
an SEI transmission-based image coding and decoding time delay testing method comprises the following steps:
(1) the encoder acquisition module writes time delay identification data into an image after detecting a first line of the input image, outputs the image written with the time delay identification data to the encoder encoding module, and outputs an input time delay test pulse to the outside;
(2) the encoder coding module extracts the time delay identification data from the image written with the time delay identification data, codes the image, writes the time delay identification data into an SEI field of a compressed code stream after coding, and outputs the compressed code stream written with the time delay identification data to a decoder;
(3) the decoder extracts the time delay identification data from the compressed code stream, decodes the time delay identification data and outputs a recovery time delay test pulse to the outside;
(4) and measuring the difference value of the two time delay test pulses of the input time delay test pulse and the recovery time delay test pulse to obtain time delay information.
Wherein, the step (1) specifically comprises the following steps:
(1.1) taking M frames of images as a group of input encoder acquisition modules;
(1.2) when the encoder acquisition module detects that the first line of each group of first frame images is input, replacing the brightness values of the first N pixels of the line with a time delay identifier a, and outputting a time delay test pulse outwards; when the input of the first row of each group of other frame images is detected, replacing the brightness values of the first N pixels of the row with a time delay identifier b; and M value is taken to ensure that the first frame interval of two adjacent groups of images is far larger than the coding and decoding time delay, N is larger than or equal to 1, and the time delay identifier a is not equal to b.
Wherein, the step (3) specifically comprises the following steps:
(3.1) the decoder extracts the time delay identification data from the user data of the SEI field in the compressed code stream;
(3.2) decoding the compressed code stream after the time delay identification data is extracted by a decoder;
and (3.3) if the current frame time delay identification data is a, outputting a time delay test pulse outwards, and if the current frame time delay identification data is b, not outputting the time delay test pulse.
Drawings
Fig. 1 is a flow chart of a delay test method of the present invention.
Compared with the prior art, the invention has the advantages that:
the invention obtains coding and decoding time delay by measuring the time delay pulse of the input image and the time delay pulse of the recovery image, has high test precision, simple operation and easy realization, can realize time delay test under various environments, is not limited to the time delay test at two ends of a coding and decoding system, and can also respectively output the input time delay pulse to be tested in sections at each node of collection, coding, transmission, decoding, display and the like.
Detailed Description
The invention is further described below with reference to fig. 1 and the examples.
The invention relates to an SEI transmission-based image coding and decoding time delay testing method, which mainly comprises the following steps of:
step 1, an encoder acquisition module takes M frames of input images as a group; when detecting the input of the first line of the group of first frame images, replacing the brightness values of the first N pixels of the line with a time delay identifier a; when the input of the first row of the group of other frame images is detected, replacing the brightness values of the first N pixels of the row with a time delay identifier b; and simultaneously, externally outputting input image time delay pulse.
Specifically, the value of M should ensure that the first frame interval of two adjacent groups of images is far greater than the coding and decoding delay, the value of N is greater than or equal to 1, and the delay identifier a is not equal to b.
Step 2, the encoder coding module extracts the time delay identification data from the first row of the image written with the time delay identification data and codes the time delay identification data, writes the time delay identification data into user data of an SEI (auxiliary enhancement information) field of the compressed code stream after coding, and outputs the compressed code stream written with the time delay identification data to a decoder;
step 3, before decoding, the decoder extracts time delay identification data from the compressed code stream and outputs a time delay test pulse while decompressing the image display; before decoding, a decoder firstly extracts delay identification data from user data of an SEI field of a code stream; the decoder completes image decoding; when the decoded and recovered image is sent to display, if the current frame time delay identification data is a, the time delay pulse of the recovered image is output, and if the current frame time delay identification data is b, the time delay pulse is not output.
Step 4, inputting the image time delay pulse time node as T0The time node of the time delay pulse of the recovered image is T1Then the frame is delayed by Tdelay＝T1-T0And simultaneously measuring two pulses through an oscilloscope to obtain time delay information, performing times of accumulative test in the test process, such as 10 times of test, and taking an average value or a minimum value according to project requirements.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (2)
1. An SEI transmission-based image coding and decoding time delay testing method is characterized by comprising the following steps:
(1) the encoder acquisition module writes time delay identification data into an image after detecting a first line of the input image, outputs the image written with the time delay identification data to the encoder encoding module, and outputs an input time delay test pulse to the outside; the method specifically comprises the following steps:
(1.1) taking M frames of images as a group of input encoder acquisition modules;
(1.2) when the encoder acquisition module detects that the first line of each group of first frame images is input, replacing the brightness values of the first N pixels of the line with a time delay identifier a, and outputting a time delay test pulse outwards; when the input of the first row of each group of other frame images is detected, replacing the brightness values of the first N pixels of the row with a time delay identifier b; the value of M is to ensure that the first frame interval of two adjacent groups of images is far larger than the coding and decoding time delay, N is larger than or equal to 1, and a time delay identifier a is not equal to b;
(2) the encoder coding module extracts the time delay identification data from the image written with the time delay identification data, codes the image, writes the time delay identification data into an SEI field of a compressed code stream after coding, and outputs the compressed code stream written with the time delay identification data to a decoder;
(3) the decoder extracts the time delay identification data from the compressed code stream, decodes the time delay identification data and outputs a recovery time delay test pulse to the outside;
(4) and measuring the difference value of the two time delay test pulses of the input time delay test pulse and the recovery time delay test pulse to obtain time delay information.
2. The SEI transmission-based image coding and decoding delay test method according to claim 1, wherein: the step (3) specifically comprises the following steps:
(3.1) the decoder extracts the time delay identification data from the user data of the SEI field in the compressed code stream;
(3.2) decoding the compressed code stream after the time delay identification data is extracted by a decoder;
and (3.3) if the current frame time delay identification data is a, outputting a time delay test pulse outwards, and if the current frame time delay identification data is b, not outputting the time delay test pulse.
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