Articles
Audio phase: Robin Palmer asks why it is wobbly?
Robin Palmer 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.
Tags: iss077 | audio phase | cel-soft | technical specification | phasing | wobbly | vectorscope | levels | display | Robin Palmer
Contributing Author Robin Palmer Click to read
What you see is what you get? Doubtful!
Robin Palmer The 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. People involved in broadcast, video editing and movie colour grading are probably unlikely to have been subjected to a compulsory Ishihara colour vision test.
Tags: iss074 | color | colour | broadcast | ishihara | test | patterns | sight | vision problems | pixel-scope | cel-soft | Robin Palmer
Contributing Author Robin Palmer Click to read
The highs and lows of histograms
N/A 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.
Tags: iss071 | cel-soft | histogram | cel-scope | rell-check solo | N/A
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Wibbly Wobbly Waveforms
N/A 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 useful waveform monitor.
Tags: iss070 | cel-soft | cel-scope3d | waveform | monitoring | vectorscope | N/A
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Pointing out the right colours
N/A 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 and problems. These could cause colour degradation or be completely wrong. In the digital age, colour information is carried in digits which do not usually get corrupted at each regeneration or link. So why would you want to look the chroma (colour information), portrayed on the same analogue style instrument?
Tags: iss069 | cel-soft | cel-scope 3d | celsoft | celscope | vectorscope | N/A
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Watch out for dead pixels
N/A 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.
Tags: iss068 | dead pixels | cel-soft | Pixelfantastic | reel-check | soloqc | cel-scope3d | N/A
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Testing times of a 4K world
N/A 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 camera sensor and display technology are now allowing manufacturers to offer 4K products at prices not too much more than their high definition equivalents.
Tags: iss067 | 4k | cel-soft | blackmagic | aja | test | measurement | N/A
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Are you out on the range
N/A 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 uncomfortable for the viewer.
Tags: iss064 | bskyb | cel-scope 3d | 3d production | cel-soft | N/A
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Light weight 3D side-by-side production
N/A 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.
Tags: iss063 | cel-soft | 3d | toshiba ik-hd1 | cel-scope3d | N/A
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BVE 2012 in no particular order.......
N/A If you read TV-Bay regularly, you will already be aware of the main trends in video and audio product development. BVE 2012 reflected these very accurately, notably the ongoing transition to file-based content capture and the growing interest in compact cameras. A good way to identify hot new products at any trade event is to identify which stands are attracting the biggest flock of visitors. Lets look at some of the key BVE crowd-pullers.
Tags: iss063 | bve2012 | aja | blackmagic | cameracorps | canon | cel-soft | eyeheight | for-a | holdan | datavideo | ianiro | jvc | newtek | nikon | ntp | panasonic | preco | roland | rosco | sienna | sonifex | sony | N/A
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3D Diaries Cameras: more for less
Bob Pank# 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 those twin-lens cameras where most of the parameters are fixed except for the convergence point.
Tags: 3d | iss062 | steroe 3d | twin-lens camera | cel-soft | Bob Pank#
Contributing Author Bob Pank# Click to read
Unconvincing conversion?
N/A 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.
Tags: iss062 | cel-soft | stereoscopic analyser | bskyb guidelines | 3d | N/A
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Headache-free 3D
N/A Whatever display technology is used to deliver the 3D images, it is obviously important not to send viewers home with a headache, particularly before they have actually invested in a 3D system of their own. It helps a lot if 3D programme producers understand what causes such headaches because only then can they take effective measures to avoid them.
Tags: iss060 | 3d diaires | cel-soft | cel-scope3d | stereoscopic signal analyser | N/A
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Keeping both eyes on the ball
N/A 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.
Tags: 3d | iss056 | cel-soft | cel-scope | N/A
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On the level
N/A 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 on-set or in post-production, they could lead the visually objectionable artefacts in 3D portrayal.
Tags: 3d | iss054 | camera filters | dual stream | monitoring | test and measurement | cel-scope | cel-soft | N/A
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Whats new in broadcast test and measurement
N/A The test and measurement product category continues to expand as the broadcast business itself diversifies. Notable recent developments include higher resolution displays and a gradually increasing number of analysers which, having detected a fault, endeavour to fix it. No sign at NAB 2011 of any tablet-based test and measurement equipment but perhaps that is only a matter of time.....
Tags: iss054 | eye to eye | test and measurement | agama | cel-soft | dk technologies | dolby | hamlet | leader | murraypro | omnitek | phabrix | pixelmetrix | rohde schwarz | tektronix | vidcheck | N/A
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A little bit over the top
N/A Vertical disparities in 3D stereoscopic images have several causes: principally they would be due to one camera being mounted such that its optical axis is higher than the other.
Tags: iss053 | 3d vertical disparities | 3d stereoscopic | cel-soft 3d analyser | N/A
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Getting the 3D words right
N/A Captions and sub-titling in 3D is not so easy as in 2D. The words cannot simply be superimposed over 3D content. They need to be accurately positioned in the depth plane otherwise they can create visual confusion and break the whole 3D illusion.
Tags: iss052 | 3d captions | 3d sub-titling | subtitles | captions | dvb-3dtv | depth disparity | cel-soft | N/A
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Eyeballing 3D errors
N/A Standard-issue human eyeballs are very adaptive and clever. Of course its the massively powerful image processing in the visual cortex of the brain that really allows us to resolve 3D images.
Tags: 3d | iss050 | 3d errors | cel-soft | stereographer | cel-scope3d | N/A
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tv-bay IBC2010 double takes
N/A Acquisition, audio, grip, graphics and post, storage and archive, teat and measurement, 3d, monitoring...and much more from IBC2010
Tags: ibc | ibc2010 | iss046 | Acquisition | audio | grip | graphics and post | storage and archive | teat and measurement | 3d | monitoring | panasonic | sony | cinedeck | bluebell | p+s technik | canon | studer | rts telex | nhk | wohler | vario | autoscript | blackmagic | orad | brainstom | autodesk | maxell | glyph | mode-al | frontniche | convergent design | cel-soft | N/A
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Not so Good Vibrations
N/A When shooting with ordinary 2D, you can almost do what you like with camera dynamics. If you pan wildly from side to side or up and down, what you see through the viewfinder is what you will actually get. If there is going to be some camera shake or vibration, you can opt to switch in a stabiliser in the camera or the lens system. In 3D these are definitely not to be recommended.
Tags: 3d | iss046 | cel-soft | vibratrions | 3d camera shake | N/A
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More than meets the eye
N/A Synchronisation is not really a problem using two professional cameras. You just loop through your reference (black) to each and you are all done. In the old days, (well not that long ago), you had to worry about PAL SCH and accurate sync matching
Tags: 3d | syncronisation | GOP mPEG | cel-soft | iss045 | N/A
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3d Technical
N/A In June there were two major events for those interested in 3D TV technologies. There has been the one day 3D Masters at BAFTA on the 22nd in Londons Piccadilly . Earlier in the month we had the Dimension 3 Expo in Paris over 3 days from 1st to the 3rd.
Tags: 3d | cel-soft | iss043 | bafta | dimension 3 | paris | N/A
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Why do poorly composed 3D stereoscopic images give headache and eye-strain problems
N/A The brain is used to being able to fuse the two separate views of the world seen from each eye into a 3D perceived scene. However we have a closed-loop system and the eye muscles constantly pull convergence and focus depending on the region of interest.
Tags: 3d stereoscopic | 3d diaries | cel-soft | white balance | gamma | 5 axis camera alignment | 3d | iss041 | N/A
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Total Articles: 24 [1-24]