Articles

Articles, opinion and reviews from the industry. It is free to add your own articles, just login / register and follow the links in your KitHub panel.

Audio phase: Robin Palmer asks why it is wobbly?

---

Phase meters and audio vectorscopes are to be found on most test kit involved with audio monitoring. This is important because left/right audio correlation problems between the channels will distort the stereo ‘image’ and could degrade mono compatibility. If left and right phase should ever be inverted, any centered identical audio would be cancell...

Submitted by Robin Palmer

Published 01 June 2013

What you see is what you get? Doubtful!

---

by Robin PalmerThe colour you see is not necessarily the same colour experienced by someone else looking at the same thing. It all depends on the viewer and the viewing conditions as well as the actual colour of the thing. In some professions having perfect colour vision is a matter of safety as in the case of airline pilots and those in railway si...

Submitted by Robin Palmer

Published 01 March 2013

The highs and lows of histograms

---

Histogram displays for video analysis probably followed those found in common computer graphics programs such as Adobe Photoshop. This can be very useful in finding video signal problems that would be difficult or impossible to see with a conventional waveform display. The histogram is a way of showing statistical results as a bar-chart. The range...

Submitted by Kieron Seth#

Published 01 December 2012

Wibbly Wobbly Waveforms

---

The very first analytical electronic instrument, developed in the late 1890s, was the oscilloscope. This used a cathode ray tube (CRT) to paint a graph of voltage on the Y axis versus time on the X axis. Once television became a practical reality in the 1930s, the same instrument was applied to the video output from the camera and became the very u...

Submitted by Bob Pank#

Published 01 November 2012

Pointing out the right colours

---

In the old days of PAL and NTSC analogue television, a vectorscope was an essential tool for examining chroma at every part for the programme production and transmission chain. This was because the colour information was carried as a phase and amplitude modulation which could be sensitive to a variety of transmission or recording non-linearities an...

Submitted by Bob Pank#

Published 01 October 2012

Watch out for dead pixels

---

A dead pixel in a camera imaging sensor can manifest itself in a number of ways. Implying black, 'dead' is not necessarily the correct term for a pixel failure. This is because imager defects include hot pixels, sparkles, noisy or lazy pixels. These problems usually arise during the chip manufacturing process. Defective pixels can appear as unusual...

Submitted by Bob Pank#

Published 01 September 2012

Testing times of a 4K world

---

The term '4K' applies to some five slightly different picture formats with around 4,000 pixel horizontal resolution: all much bigger than HD. In fact roughly four times the total pixels required for 1920 x 1080 pixel high definition. 4K has been around for some years but was until recently only affordable by producers with mega budgets. Advances in...

Submitted by Will Strauss#

Published 01 August 2012

Are you out on the range

---

The main parameters to worry about in any stereoscopic scene are the most negative and positive disparity values. These numbers are usually expressed in percentage terms rather than in actual screen pixels. The distance between the numbers is the depth range. The depth budget is the maximum value this range can be allowed without being too uncomfor...

Submitted by Will Strauss#

Published 01 May 2012

Light weight 3D side-by-side production

---

Whenever you see a typical publicity picture of a 3D production shoot, it invariably includes a very bulky and expensive-looking mirror rig. This can look daunting for the new initiate coming into 3D production and is not the sort of kit you might not want to risk using outdoors. The mirror rig arrangement allows two (usually large) cameras to be p...

Submitted by Bob Pank#

Published 01 April 2012

BVE 2012 in no particular order.......

---

The big story at BVE 2012 was BVE 2013. With the Earls Court exhibition site scheduled for redevelopment, BVE relocates next year to the ExCel exhibition site in London’s Docklands. The distance is only about 10 miles but, in the minds of many BVE exhibitors, the move is comparable with moving the NAB Convention to the Mississippi Delta. If you rea...

Submitted by Bob Pank#

Published 01 April 2012

3D Diaries Cameras: more for less

---

http://www.tv-bay.com/imag/issue062/files/44.htmlCameras: more for less?There is plenty of guidance available about how to shoot ‘good’ stereo 3D and the principles are quite easy to understand. Achieving good results takes good equipment and, maybe, the assistance of a stereographer and even a convergence puller... unless you are using one of thos...

Submitted by Bob Pank#

Published 01 March 2012

Unconvincing conversion?

---

There have appeared in the last year or two an amazing array of 2D to 3D conversion boxes and software processors. Also nearly every major manufacturer of high end 3D sets has its own proprietary built-in processor allowing the user to view any ordinary TV broadcast or DVD instantly as a 3D rendition. The production of genuine 3D is expensive compa...

Submitted by Bob Pank#

Published 01 March 2012

Headache-free 3D

---

With over 30 broadcast channels now offering 3D programmes, and cinemas in practically every major town and city equipped to show 3D films, demand for stereoscopic content is increasing rapidly. Display manufacturers are now responding to this growing market with various new technologies intended to improve the viewing experience. A useful show for...

Submitted by Bob Pank#

Published 01 January 2012

Keeping both eyes on the ball

---

It goes without saying that spectator sports are made for television; of course they are, as can easily be proved by trying to follow a football match on radio. A skilled radio commentator can describe key aspects of the action fairly well but television actually gives viewers the impression that they are sitting in the stadium. Widescreen high def...

Submitted by Bob Pank#

Published 01 September 2011

On the level

---

In shooting 3D you naturally have two cameras and two lenses: albeit, there are some weird and wonderful single lens/single sensor contraptions out there. This usually means there are any number of ways each camera lens combination could be producing images with minor are major signal level differences. If these level differences are not dealt with...

Submitted by Bob Pank#

Published 01 July 2011