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

Startup SafePass Profile on Oct 19, 2018
A major problem with visitor management is that the systems mostly require adhesive printed paper labels and paper logs, creating waste and an...
China Is Not A Security Megatrend, Says SIA on Oct 19, 2018
The US Security Industry Association has released its 10 "Security Megatrends" for 2019. SIA declares that these megatrends, such as "Advanced...
Hanwha Dual Imager Dome Camera Tested (PNM-7000VD) on Oct 18, 2018
Hanwha has introduced their first dual-imager model, the PNM-7000VD, a twin 1080p model featuring independently positionable sensors and a snap-in...
Camera Height / Blind Spot Added to IPVM Camera Calculator on Oct 18, 2018
IPVM has added camera height and blind spot estimation to the Camera Calculator. This is especially helpful for those who need to mount cameras up...
Axis Strong US Growth, Flat EMEA - Q3 2018 Financials on Oct 18, 2018
This spring, Axis had its best financials in many years (see Axis Strong Q2 2018 Results). However, over the summer, Axis had many products sold...
Best Alternatives to Banned Dahua and Hikvision on Oct 17, 2018
With the US government ban and a growing number of users banning Dahua and Hikvision, one key question is what to use for low cost? While Dahua and...
Video Quality / Compression Tutorial on Oct 17, 2018
While CODECs, like H.264, H.265, and MJPEG, get a lot of attention, a camera's 'quality' or compression setting has a big impact on overall...
Knightscope Winning Investors, Struggling With Growth on Oct 16, 2018
While Knightscope's new financials show the company only winning 11 new customers in the past 12 months, the company continues to win new...
Integrator Laptop Guide on Oct 16, 2018
This 18-page guide provides guidance and statistics about integrator laptop use. 150 integrators explained to IPVM in detail about their laptops,...
Huawei Admits AI "Bubble" on Oct 16, 2018
A fascinating article from the Chinese government's Global Times: Huawei’s AI ambition to reshape industries. While the Global Times talks about...

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