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

May 2018 Camera Course on Apr 25, 2018
Save $50 on early registration until this Thursday, the 26th. Register now (save $50) for the Spring 2018 Camera Course This is the only...
Death Of A Dummy Camera Manufacturer on Apr 25, 2018
5 years ago, IPVM gathered insights from a dummy camera manufacturer, who was then the top selling dummy camera provider on Amazon and 3rd in all...
Hikvision Critical Cloud Vulnerability Disclosed on Apr 25, 2018
Security researchers Vangelis Stykas and George Lavdanis discovered a vulnerability in Hikvision's HikConnect cloud service that: just by...
The Yolo Bro And The Death of Journalism on Apr 24, 2018
There's an old quote: The job of the newspaper is to comfort the afflicted and afflict the comfortable Unfortunately, the opposite is more...
DMP Adds Ring Video Doorbell Integration on Apr 24, 2018
Video doorbells have become one of the hottest items for security systems. After several years with no doorbell, DMP has announced integration with...
Milestone 2017 Financials Examined on Apr 24, 2018
For ISC West 2018, Milestone released ... their financials, touting "strong revenue growth in 2017". However, there were discrepancies with the...
Chinese Manufacturer Kickstarter Campaign Huge Success (EverCam) on Apr 23, 2018
In a week, a Chinese manufacturer's expertly done Kickstarter campaign has received $1.4 million in pledges, an incredible amount for a video...
Favorite Biometrics 2018 on Apr 23, 2018
Biometrics are on the rise, or at least integrator opposition to them is declining, according to new IPVM integrator statistics.   Almost half of...
Dahua and Hikvision Win Over $1 Billion In Government-Backed Projects In Xinjiang on Apr 23, 2018
Dahua and Hikvision have won well over $1 billion worth of government-backed surveillance projects in China’s restive Xinjiang province since 2016,...
Global Real-Time Video Surveillance - EarthNow on Apr 20, 2018
A new company, EarthNow, with backing from Bill Gates, Airbus and more, is claiming that: Users will be able to see places on Earth with a delay...

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