CN105657427A - High-definition image compression method and system suitable for catenary - Google Patents
High-definition image compression method and system suitable for catenary Download PDFInfo
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- CN105657427A CN105657427A CN201610047341.3A CN201610047341A CN105657427A CN 105657427 A CN105657427 A CN 105657427A CN 201610047341 A CN201610047341 A CN 201610047341A CN 105657427 A CN105657427 A CN 105657427A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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Abstract
The invention discloses a high-definition image compression method and system suitable for a catenary. The method comprises the following steps: S1, obtaining high-definition image stream data; S2, sequentially extracting each frame of high-definition image in the image stream data; S3, judging whether the current high-definition image is the first frame of image of the image stream data, if so, skipping to a step S4, and otherwise, skipping to a step S5; S4, creating a video compression file and a corresponding index file, and writing a file header in the index file; S5, compressing the current frame of high-definition image and writing the same in the video compression file, and writing the corresponding frame information in the index file; and S6, judging whether the current high-definition image is the last frame of image of the image stream data, if so, terminating the current compression; and otherwise, skipping to the step S3, and carrying out the operations in the step S3 to the step S6 on the next frame of high-definition image. By adopting the high-definition image compression method and system suitable for the catenary disclosed by the invention, the problems of large necessary storage space and high cost of a high-definition video of a highway catenary are solved.
Description
Technical field
The present invention relates to a kind of high-definition image compression method suitable in contact net and system.
Background technology
Railway contact line is that railroad train (locomotive and motor-car) provides reliable continual electric energy, transmits electric energy by supply lines and pantograph (abbreviation bow net) to train. By shooting the various station diagram picture of railway contact line (pantograph and supply lines, column and davit etc.), again through image analysis calculation security monitoring parameter, carry out safety detection. Utilize high definition imaging device shooting railway contact line, it is possible to obtain at a high speed the high-definition image of railway contact line, provide favorable factor for graphical analysis. If directly storage railway contact line high-definition image, it is necessary to more memory space, later stage process is also required to bigger memory headroom, is unfavorable for reducing cost.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of high-definition image compression method suitable in contact net and system, needed for solving railway contact line HD video, memory space is big, the problem that cost is high.
It is an object of the invention to be achieved through the following technical solutions: a kind of high-definition image compression method suitable in contact net, comprise the following steps:
S1. the high-definition image flow data of railway contact line is obtained from high definition camera;
S2. each frame high-definition image in image stream data is taken out successively with the time order and function order of high definition camera shooting;
S3. judge that whether present frame high-definition image is the first two field picture of image stream data:
(1) if present frame high-definition image is the first two field picture of image stream data, step S4 is jumped to;
(2) if present frame high-definition image is not the first two field picture of image stream data, step S5 is jumped to;
S4. create video compress file and corresponding index file, and indexed file writes file header;
S5. present frame high-definition image is compressed, obtains compression image, and compression image is write in video compress file with additional pattern, generate corresponding frame information for compression image, and the frame information generated is write in index file with additional pattern;
S6. judge that whether present frame high-definition image is the last frame image of image stream data:
(1) if present frame high-definition image is the last frame image of image stream data, this second compression terminates;
(2) if present frame high-definition image is not the last frame image of image stream data, jump to step S3, next frame high-definition image is carried out the operation of step S3 ~ S6;
The frame number compressing image in described video compress file starts counting up from 0.
Described step S4 includes following sub-step:
S41. video compress file and corresponding index file are created;
S42. writing file header in indexed file, the file header of write includes picture traverse information and the picture altitude information of video compress file;
Described step S5 includes following sub-step:
S51. present frame high-definition image is compressed, obtains compression image, and currently available compression image is write in video compress file with additional pattern;
S52. generate corresponding frame information for current compression image, indexed file writes, with additional pattern, the frame information that current compression image is corresponding; The frame information of write includes compressing image data size information, the image start position information in video compress file and image capturing time stamp information.
After compression of images, it is possible to use known frame number searches corresponding timestamp information, or finds the compression image that this frame number is corresponding in compressed video file, in like manner, by known timestamp information, it is also possible to try to achieve the frame number of correspondence.
A kind of high-definition image compressibility suitable in contact net, including data acquisition module and data processing module; Described data processing module includes video compress file creating unit, index file creation unit, image compression unit and frame information and generates unit:
Described data acquisition module for obtaining railway contact line high-definition image flow data from high definition camera;
Described video compress file creating unit is used for creating video compress file;
Described index file creation unit is used for creating index file;
Described video compressing unit is for being compressed each frame high-definition image in image stream data, and image compression obtained writes in video compress file with additional pattern;
Described frame information generates the unit image delta frame information for obtaining for the clear compression of images of each vertical frame dimension in image stream data, and is write in index file with additional pattern by the frame information generated.
The invention has the beneficial effects as follows: the image stream data of HD video is compressed by (1), needed for solving railway contact line HD video, memory space is big, the problem that cost is high;
(2) in the process that the image stream data of HD video is compressed, the image obtained for the clear compression of images of each vertical frame dimension generates corresponding index information, lays a good foundation for successive image process, analysis and identification.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of the present invention;
Fig. 2 is the system principle diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme is described in further detail, but protection scope of the present invention is not limited to the following stated.
As it is shown in figure 1, a kind of high-definition image compression method suitable in contact net, comprise the following steps:
S1. the high-definition image flow data of railway contact line is obtained from high definition camera;
S2. each frame high-definition image in image stream data is taken out successively with the time order and function order of high definition camera shooting;
S3. judge that whether present frame high-definition image is the first two field picture of image stream data:
(1) if present frame high-definition image is the first two field picture of image stream data, step S4 is jumped to;
(2) if present frame high-definition image is not the first two field picture of image stream data, step S5 is jumped to;
S4. create video compress file and corresponding index file, and indexed file writes file header;
S5. present frame high-definition image is compressed, obtains compression image, and compression image is write in video compress file with additional pattern, generate corresponding frame information for compression image, and frame information is write in index file with additional pattern;
S6. judge that whether present frame high-definition image is the last frame image of image stream data:
(1) if present frame high-definition image is the last frame image of image stream data, this second compression terminates;
(2) if present frame high-definition image is not the last frame image of image stream data, jump to step S3, next frame high-definition image is carried out the operation of step S3 ~ S6;
Further, the image stream data obtained from high definition camera is BMP image stream data, and in BMP image stream data, each frame high-definition image is BMP image, and described compression image is jpeg image.
Described step S4 includes following sub-step:
S41. video compress file and corresponding index file are created;
S42. writing file header in indexed file, the file header of write includes picture traverse information and the picture altitude information of video compress file;
Described step S5 includes following sub-step:
S51. present frame high-definition image is compressed, obtains compression image, and currently available compression image is write in video compress file with additional pattern;
The frame number compressing image in video compress file starts counting up from 0, and setting video compressed file totalframes is n, and the frame number of the 1st two field picture is 0, the frame number 1 of the 2nd two field picture, and the frame number of the i-th two field picture is i-1, i is the integer more than 0 less than or equal to n.
S52. generate corresponding frame information for current compression image, indexed file writes, with additional pattern, the frame information that current compression image is corresponding; The frame information of write includes compressing image data size information, the image start position information in video compress file and image capturing time stamp information.
As in figure 2 it is shown, a kind of high-definition image compressibility suitable in contact net, including data acquisition module and data processing module; Described data processing module includes video compress file creating unit, index file creation unit, image compression unit and frame information and generates unit:
Described data acquisition module for obtaining railway contact line high-definition image flow data from high definition camera;
Described video compress file creating unit is used for creating video compress file;
Described index file creation unit is used for creating index file;
Described video compressing unit is for being compressed each frame high-definition image in image stream data, and image compression obtained writes in video compress file with additional pattern;
Described frame information generates the unit image delta frame information for obtaining for the clear compression of images of each vertical frame dimension in image stream data, and is write in index file with additional pattern by the frame information generated.
Due in compression process to obtain for the clear compression of images of each vertical frame dimension image generates the frame information of correspondence and writes in index file with additional pattern, therefore in the follow-up process that compression video is processed, be convenient to post analysis and process.
After compression of images, it is possible to use known frame number searches corresponding timestamp information, or finds the compression image that this frame number is corresponding in compressed video file, in like manner, by known timestamp information, it is also possible to try to achieve the frame number of correspondence;
Actually, contact net carry out in the process of high-definition image collection, also need to be synchronously performed infrared image acquisition, owing to infrared camera is likely to different with the physical characteristic frame per second of high definition camera, the frame number of shooting per second is likely to difference, in subsequent processes, it is often necessary to search high-definition image and the infrared image of synchronization;Frame information in index file just becomes the benchmark that high-definition image is Tong Bu with infrared image, such as, timestamp by a certain infrared image, just can find the frame number of high-definition image in synchronization by this timestamp, the compression image in compressed video file is found out, thus realizing the synchronization of high-definition image and infrared image again through this frame number.
Claims (4)
1. the high-definition image compression method being applicable to contact net, it is characterised in that: comprise the following steps:
S1. the high-definition image flow data of railway contact line is obtained from high definition camera;
S2. each frame high-definition image in image stream data is taken out successively with the time order and function order of high definition camera shooting;
S3. judge that whether present frame high-definition image is the first two field picture of image stream data:
(1) if present frame high-definition image is the first two field picture of image stream data, step S4 is jumped to;
(2) if present frame high-definition image is not the first two field picture of image stream data, step S5 is jumped to;
S4. create video compress file and corresponding index file, and indexed file writes file header;
S5. present frame high-definition image is compressed, obtains compression image, and compression image is write in video compress file with additional pattern, generate corresponding frame information for compression image, and the frame information generated is write in index file with additional pattern;
S6. judge that whether present frame high-definition image is the last frame image of image stream data:
(1) if present frame high-definition image is the last frame image of image stream data, this second compression terminates;
(2) if present frame high-definition image is not the last frame image of image stream data, jump to step S3, next frame high-definition image is carried out the operation of step S3 ~ S6.
2. a kind of high-definition image compression method suitable in contact net according to claim 1, it is characterised in that: described step S4 includes following sub-step:
S41. video compress file and corresponding index file are created;
S42. writing file header in indexed file, the file header of write includes picture traverse information and the picture altitude information of video compress file.
3. a kind of high-definition image compression method suitable in contact net according to claim 1, it is characterised in that: described step S5 includes following sub-step:
S51. present frame high-definition image is compressed, obtains compression image, and currently available compression image is write in video compress file with additional pattern;
S52. generate corresponding frame information for current compression image, indexed file writes, with additional pattern, the frame information that current compression image is corresponding; The frame information of write includes compressing image data size information, the image start position information in video compress file and image capturing time stamp information.
4. the high-definition image compressibility being applicable to contact net, it is characterised in that: include data acquisition module and data processing module; Described data processing module includes video compress file creating unit, index file creation unit, image compression unit and frame information and generates unit:
Described data acquisition module for obtaining railway contact line high-definition image flow data from high definition camera;
Described video compress file creating unit is used for creating video compress file;
Described index file creation unit is used for creating index file;
Described video compressing unit is for being compressed each frame high-definition image in image stream data, and image compression obtained writes in video compress file with additional pattern;
Described frame information generates the unit image delta frame information for obtaining for the clear compression of images of each vertical frame dimension in image stream data, and is write in index file with additional pattern by the frame information generated.
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