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BS 8495:2007 Code of practice for digital CCTV recording systems for the purpose of image export to be used as evidence, 2007
- Contents [Go to Page]
- 1 Scope 1
- 2 Normative references 2
- 3 Terms, definitions and abbreviations 2
- 4 General recommendations 4
- 5 Fitness for purpose of recorded images 4
- 6 Audit trail 5
- 7 Image integrity 6
- 8 Time and date integrity 6
- 9 Storage 7
- 10 Export of images 8
- 11 Replay of exported images 9
- Bibliography 10
- Foreword
- Introduction [Go to Page]
- a) Whether the image’s audit trail from the digital recording device to the court is robust.
- b) Whether the integrity of the image can be proven.
- 1 Scope [Go to Page]
- a) Fitness for purpose of recorded images.
- b) Audit trail.
- c) Image integrity.
- d) Time and date integrity.
- e) Storage.
- f) Export of images.
- g) Replay of exported images.
- 2 Normative references
- 3 Terms, definitions and abbreviations [Go to Page]
- 3.1 Terms and definitions
- 3.2 Abbreviations
- 4 General recommendations [Go to Page]
- a) subject size within the field of view of the camera;
- b) lighting of subjects within field of view;
- c) camera and lens specification;
- d) transmission medium;
- e) system maintenance.
- 5 Fitness for purpose of recorded images [Go to Page]
- a) Level of recorded digital image compression per camera.
- b) Image per second record rate per camera.
- c) Recorded digital image resolution.
- 6 Audit trail [Go to Page]
- a) User logon and logoff. [Go to Page]
- 1) ID of the user.
- 2) The time and date of the event.
- b) Time and date changes (automated and manual). [Go to Page]
- 2) New time and date immediately after the point of change.
- 3) ID of user making the change.
- c) When recording is started or stopped manually. [Go to Page]
- 2) ID of user starting or stopping recording.
- d) Any enhancement applied to images. [Go to Page]
- 2) Time and date of image enhancement.
- 3) ID of user enhancing the image.
- 4) Details of enhancement(s).
- e) Exporting of images. [Go to Page]
- 2) Time and date of image export.
- 3) ID of user exporting the image.
- f) Images that have been manually tagged or untagged to prevent or permit overwriting. [Go to Page]
- 2) ID of user tagging/untagging the image.
- g) Manual deletion of images. [Go to Page]
- 2) Time and date of image deletion.
- 3) ID of user deleting the image.
- h) What (if any) removable medium is used for primary storage.
- 7 Image integrity
- 8 Time and date integrity
- 9 Storage [Go to Page]
- 9.1 Storage capacity [Go to Page]
- a) Recording retention period.
- b) Image per second rate.
- c) Resolution/compression of image.
- 9.2 Storage functionality [Go to Page]
- a) how many days and hours of recording the system has stored or the time of the earliest recording on the system; and
- b) an estimated retention period based on the changing of settings.
- 9.3 Removable storage media
- 10 Export of images [Go to Page]
- 10.1 Image enhancements
- 10.2 Image export [Go to Page]
- a) A simple user guide should be available locally for reference by a trained operator.
- b) The facility should be provided for the export of images from selected cameras within user-defined time periods.
- c) Simultaneous export and recording should be possible without affecting the performance of the system except on systems that require removal of the primary storage media for export purposes.
- d) The export method of the DCRS should be appropriate to the capacity of the system and its expected use. [Go to Page]
- b) the removable hard disk, which holds the images, is physically removed from the DCRS.
- c) images are exported via a port, such as USB, SCSI, SATA, FireWire or networking.
- e) Documentation should be supplied to the user regarding both the retention period of the system and the approximate times to export each of the following. [Go to Page]
- 2) Up to 24 hours of recorded data per camera.
- 3) All of the data on the system.
- f) The system should display an estimated time to complete the export of the requested data.
- g) The software needed to replay the images should be included on the media used for export, otherwise viewing by authorized third parties can be hindered.
- h) The system should not apply any format conversion or further compression to the exported images, as this can reduce the usefulness of the content.
- i) Any original metadata and/or authentication signatures should be exported with the images.
- 11 Replay of exported images [Go to Page]
- a) have variable speed control including frame-by-frame forward and reverse viewing;
- b) display single and multiple cameras and maintain aspect ratio i.e. the same relative height and width;
- c) display a single camera at the maximum recorded resolution;
- d) permit the recordings from each camera to be searched by time and date;
- e) allow printing and/or saving (e.g. bitmap or JPEG) of still images with time and date of recording;
- f) allow for time synchronized multi-screen replay;
- g) allow for time synchronized switching between cameras upon replay;
- h) allow replay of associated audio and other metadata;
- i) be able to export the image sequences in a standard format at an equivalent quality to the original and still displaying time and date information (e.g. MPEG-2, MPEG-4 or MJPEG);
- j) clearly show the time and date, and any other information associated with each displayed image, without obscuring the image.
- Bibliography [Go to Page]
- [1] HOME OFFICE SCIENTIFIC DEVELOPMENT BRANCH. Digital imaging procedure. Publication 58/07, Version 2.0, November 2007.
- [2] GREAT BRITAIN. Data Protection Act 1998. London: The Stationery Office.
- [3] THE INFORMATION COMMISSIONER’S OFFICE. CCTV code of practice. July 2000.
- [4] HOME OFFICE SCIENTIFIC DEVELOPMENT BRANCH. CCTV operational requirements manual - Is your CCTV system fit for purpose? Publication 55/06, Version 4, 2007. ISBN 978 1 84726 138 0.2) [Go to Page]
