The new CCTV Video Image Calculator (VIC) & Screen Assessment Matrix (SAM) has been designed within the requirements of IEC 62676-4, to provide the tools necessary for measuring image quality of CCTV systems, camera setup, commissioning and auditing of CCTV fields of views, which provides for quantified, consistent and repeatable results.
The CCTV Video Image Calculator (VIC) & Screen Assessment Matrix (SAM) is a developed solution able to identify effective pixel densities not simply at time of image capture, but following storage and recovery of compressed files. Additionally, the system is provided with a fields of view assessment tool to support the commissioning process, for engineers and auditors to translate an Operational Requirement into a usable image. The CCTV Video Image Calculator (VIC) & Screen Assessment Matrix (SAM) is provided as a kit, which comprises of 1) “VIC” – Video Image Calculator and 2) “SAM” – Screen Assessment Matrix, as follows: –
“VIC” – Video Image Calculator
VIC is a 1600 x 400mm CCTV Target aligned with the requirements of IEC 62676-4:2014 . This provides a means of quantifying percentage Target Image Height (%TIH) as well as quantifying the discernible pixel density. The target is optimised for use with pixels per metre (ppm) but can be configured to align precisely with pixels per feet (ppf).
The target has panels in graduated resolutions so that images can be quantified at time of capture but also allows the degradation of an image due to compression to assessed. The target is designed with square pixels, diagonal lines and script as well as conventional pixel wheels and ‘Landolt C’ components in order to allow assessment of types of degradation using different compression algorithms at different resolutions.
The target is graduated in 100 mm sections and has a section set aside for the addition of vehicle number plates (supplied separately).
The top 400 mm of the Target is a target of itself and can be used when assessing resolutions when the whole target is not displayed.
The target is supplied with additional commissioning and audit aids in soft copy for use when testing camera resolution and focusing – including a handy A3 FoV Aide Memoire, A4 Resolution Panels, Resolution Cheat Sheet and Excel CCTV Calculator
“SAM” – Screen Assessment Matrix
In addition to the VIC Target, a Screen Assessment Matrix is provided.
This allows users to accurately measure the height of the standard target on the Monitor Display in order to verify the relevant operational requirement.
There is no question of ‘ it looks about fifty percent’ – the matrix allows assessment of TIH with an accuracy in practice to a single digit – thus assessments – ‘The target only occupies 47% of screen height ‘ are achievable and repeatable.
Training videos are provided for the use of both the Video Image Calculator (VIC) & Screen Assessment Matrix (SAM).
The Matrix is used as a physical transparent A4 Overlay for working at a Terminal or Control Room, or as a customised soft copy virtual overlay in MS PowerPoint for use in assessing Screen Captures in compliance with the Operational Requirement.
In cases where the %TIH is not achieved, the shortfall is highlighted and the actual pixel density can be calculated using the supplied MS Excel Spreadsheet.
The VIC Package includes two sets of A4 Overlays (Landscape and Portrait) facilitating assessments on a wide range of displays.
The “SAM” Matrix can be used to assess the size on screen of any appropriate target – package, car , van, lorry, aircraft etc. as required by the Operational Requirement.
CCTV Video Image Calculator (VIC) & Screen Assessment Matrix (SAM) – (‘Kit Inclusions’)
The following components will be supplied with each CCTV Target & Assessment System kit ordered from us: –
- Video Image Calculator (VIC) – complete with quick release tripod adaptor (1) and target base tension straps (2)
- Stainless steel collapsible tripod – with top section supporting bracket – fixing to target quick release clamp adaptor (1)
- Stainless steel tripod to target tension brackets (2)
- DORII / Face Target Solution – this is a 1.7 metre pole (3 pieces), also used for target height setup, with A4 clipboard mounting (aligned with the 62676 requirements)
- Commissioning and audit aids Soft Copy – CD (1) – Comprising of; A3 FoV Aide Memoire, A4 Resolution Panels, Resolution Cheat Sheet and Excel CCTV Calculator
- Screen Assessment Matrix (SAM) – for accurate measurement of the height of the standard target, within the field of view for each camera forming part of the system
- User manuals for both the VIC Target and SAM Matrix
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