Some good ideas

[papasmurf]

So why would a local supermarket pay ridiculous prices for state of the art CCTV when they can stick a height chart on the door?

It is standard on CCTV systems these days. 

[cromwell]

So why would a local supermarket pay ridiculous prices for state of the art CCTV when they can stick a height chart on the door?

Measuring how their customer base has grown

[Nick]

That has just been explained to you in the link and quote I posted.  Military manual photographic analysis has been doing it since the first world war has have snipers. Now software does the same job on CCTV images.

So why would a local supermarket pay ridiculous prices for state of the art CCTV when they can stick a height chart on the door? 

[papasmurf]

Think you're missing the point. How can CCTV tell you how tall some one is?

That has just been explained to you in the link and quote I posted.  Military manual photographic analysis has been doing it since the first world war has have snipers. Now software does the same job on CCTV images.

[Nick]

Depends where the CCTV is, there are discrete height indicators in some locations which are not obvious.
Plus you did ask:-
Efficient height measurement method of surveillance camera image - ScienceDirect


Abstract

As surveillance cameras are increasingly installed, their films are often submitted as evidence of crime, but very scant detailed information such as features and clothes is obtained due to the limited camera performance. Height, however, is relatively not significantly influenced by the camera performance. This paper studied the height measurement method using images from a CCTV. The information on the height was obtained via photogrammetry, including the reference points in the photographed area and the calculation of the relationship between a 3D space and a 2D image through linear and nonlinear calibration. Using this correlation, this paper suggested the height measurement method, which projects a 3D virtual ruler onto the image. This method has been proven to offer more stable values within the range of data convergence than those of other existing methods.

The discrete height indicators are the measures that I mentioned some time ago. 

ADMIN MODE OFF

You really are a cantankerous old git, always looking for an angle to counter a post. 

[papasmurf]

Think you're missing the point. How can CCTV tell you how tall some one is?

Depends where the CCTV is, there are discrete height indicators in some locations which are not obvious.
Plus you did ask:- 
Efficient height measurement method of surveillance camera image - ScienceDirect


Abstract

As surveillance cameras are increasingly installed, their films are often submitted as evidence of crime, but very scant detailed information such as features and clothes is obtained due to the limited camera performance. Height, however, is relatively not significantly influenced by the camera performance. This paper studied the height measurement method using images from a CCTV. The information on the height was obtained via photogrammetry, including the reference points in the photographed area and the calculation of the relationship between a 3D space and a 2D image through linear and nonlinear calibration. Using this correlation, this paper suggested the height measurement method, which projects a 3D virtual ruler onto the image. This method has been proven to offer more stable values within the range of data convergence than those of other existing methods.

[Nick]

Wouldn't CCTV be a better idea?

Think you're missing the point. How can CCTV tell you how tall some one is?

[papasmurf]

Here's one for a starter.

Working in Canada ATM and the supermarket have a height chart up the side of the door in case of shoplifters. They can give an accurate height description to the Police.

Wouldn't CCTV be a better idea?

[Nick]

Here's one for a starter.

Working in Canada ATM and the supermarket have a height chart up the side of the door in case of shoplifters. They can give an accurate height description to the Police.