Gish vsCalc iPhone/iPad App Reviewed

Author: John Honovich, Published on Mar 16, 2011

In this note, we examine a new iPhone/iPad application from Gish Technologies for calculating video surveillance. The goal of the application is to help designers to select the optimal cameras and lens combination for a given scene's requirements. We start with a review of how it works and conclude with a 12 minute video screencast sharing our experiences using the application.

The applications are based on 2 key elements:

  • 4 pre-defined images/scenes: a face, license plate, car and truck: These images demonstrate potential video quality. Users cannot upload their own, use iPhone/iPad2 integrated cameras, etc.
  • Detailed technical information on vendor's camera lineups: Each version of the application comes prepopulated with a different vendor's camera information, currently Axis, Arecont and Sony

A designer chooses a potential camera, the scene desired (e.g., seeing a face) and the level of visual clarity that is desired. The application then returns how wide a Field of View can meet these specifications. Additionally, the user can enter how far the target (e.g., face) is from the camera. The application then generates the correct lens size needed.

Visual Acuity Index

Perhaps the most interesting and potentially challenging aspect of the tool is its introduction of an new eponomously named index for surveillance video quality. Rather than use pixels per foot (e.g., 48 pixels per foot for clear faces or 10 pixels per foot for detecting a car), the application uses a scale of 0 to 1 to reference video quality. Inside the application, users can choose between .43, .53, .63 and .73 Gish levels roughly mapping, respectively to detection, recognition and identification levels. We found that Gish levels map to pixels per foot and that the pixels per foot doubles for each level up (e.g., if .43 Gish ~ 10 pixels per foot for a given object type, .53 Gish ~ 20 pixels per foot for the same object).

Using a singular quality scale has precedent in other industries (e.g., Mean Opinion Scores in the audio / telephony markets). That noted, it will interesting to see if this catches on in the surveillance world.

Below is our video screencast demonstrating key features of the applications:

For an alternative to this application, you could use Theia's lens calculator that includes pixels per foot calculations and sample quality images (see our related lens calculator training report). While the Theia app provides greater flexibility, it also demands greater expertise and time to look up camera specific details.

1 report cite this report:

New Surveillance Products Spring 2011 Final on Apr 06, 2011
In this report, we provide a single source listing new video surveillance products announced in Spring 2011 and in conjunction with ISC West.For...
Comments : PRO Members only. Login. or Join.

Most Recent Industry Reports

Access Control Course Spring 2019 - Last Chance on Apr 19, 2019
This is the last chance to register for the Spring Access Control Course. IPVM offers the most comprehensive access control course in the...
Riser vs Plenum Cabling Explained on Apr 18, 2019
You could be spending twice as much for cable as you need. The difference between 'plenum' rated cable and 'riser' rated cable is subtle, but the...
Verint Victimized By Ransomware on Apr 18, 2019
Verint, which is best known in the physical security industry for video surveillance but has built a sizeable cybersecurity business as well, was...
Milestone Drops IFSEC on Apr 18, 2019
Milestone has dropped out of Europe's largest annual security trade show (IFSEC 2019), telling IPVM that they "have found that IFSEC in EMEA no...
The Fastest Growing Video Surveillance Sales Organization Ever - Verkada on Apr 17, 2019
Verkada has the fastest growing video surveillance sales organization ever. In less than 2 years, they already have more salespeople in the US...
Door Operators Access Control Tutorial on Apr 17, 2019
Doors equipped with door operators, specialty devices that automate opening and closing, tend to be quite complex. The mechanisms needed to...
Securadyne CEO: IPVM 'Entertaining For An Ignorant Few' on Apr 16, 2019
Securadyne's CEO Carey Boethel is unhappy with IPVM's report - Failed Integrator Rollup, Securadyne Sells to Guard Giant Allied. Indeed, he...
Dahua Repositionable IR Multi-Imager Camera Tested on Apr 16, 2019
Dahua has released their first repositionable multi-imager camera, the Multi-Flex 4x2MP, claiming integrated IR, true WDR, and flexible...
Strong ISC West 2019 For Manufacturers But Concerns For 2020 March Move on Apr 16, 2019
ISC West 2019 was strong for manufacturers, according to new IPVM survey results of 100+ manufacturers, consistent with 2018 results. However,...
Axis Supports HD Analog on Apr 15, 2019
In 2017, Axis declared 'Everything is IP': Now, in 2019, Axis has released support for HD analog, with their new encoders.  Why the change?...

The world's leading video surveillance information source, IPVM provides the best reporting, testing and training for 10,000+ members globally. Dedicated to independent and objective information, we uniquely refuse any and all advertisements, sponsorship and consulting from manufacturers.

About | FAQ | Contact