What is vhs resolution

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Similar Threads How big is the resolution on a normal 35 mm negative? How big is the resolution on a normal 35 mm negative? And of course this means we cannot display lines of vertical resolution at that position.

You can follow through the logic that if we reduce the line count a bit say lines , the lines will no longer be in phase with the sensor's lines. Some will line up close enough to show distinct black and white lines, while others will degrade to gray. The question then becomes, at what point can we see all the lines at all phase relationships. The Extended Kell Factor attempts to estimate how many lines we can actually represent with a given discrete representations in this case scanlines.

It is a range of values, not because it is a subjective factor reading a lines-of-resolution chart is no more subjective than any reading of an analog scale, like reading a ruler or thermometer , but because of the variation between the devices that capture the video. The lens can blur the image. The sensor can have overlapping sensitivity between lines, or it can have gaps between lines.

The video can be encoded or processed in any number of ways. All of these and many other factors will affect the ability to display distinct lines. So the Extended Kell Factor provides a rule-of-thumb for estimating what can be displayed.

Vertically, this is about lines of vertical resolution. However, since the lines are distinct, separate units, just like the digital lines to which they would be converted, the number of digital lines is the same as the actual number of lines , not the lines of vertical resolution.

While analog video has the distinct horizontal scan lines to limit the vertical resolution, it has no such limits horizontally. There, it is limited by analog bandwidth. Theoretically, the maximum bandwidth of a video signal will provide us with the lines of horizontal resolution. When we divide this by the number of frames per second However, lines of horizontal resolution is defined based on a square screen called a "screen height".

This is the oft-misquoted lines of resolution, that seems to be at the root of the confusion regarding VHS resolution. When converting from lines of horizontal resolution to a digital representation, we need to consider the above effects once again.

That is, we could use pixels per VHS line, but if the vertical lines were not in phase with our pixels, we would lose that detail, even though the VHS signal would have no problem providing such an image. So once again, the Extended Kell Factor helps us estimate what we would need to use to have enough digital pixels so we can always "handle what VHS can dish out. DVDs use a pixel wide line, and are often quoted as having or even lines of horizontal resolution.

Yet, according to the Extended Kell Factor, pixels can only represent about lines of horizontal resolution. When you then compensate for the "screen height" requirement of the "lines of resolution" definition, you get only about lines of horizontal resolution. And the above discussion of lines of vertical resolution also applies here. For NTSC Broadcast, its - 40 service lines lines correspond "pixels" of subjective resolution Kell factor because TV signal is an interlaced one, and human eye somehow can detects the drop of resolution.

As for horisontal resolution, according to my book sources, the bandwidth is chosen such a way that it makes a square "pixel", which correponds to x effective resolution. Just record some high-quality TV broadcast and play it back. The degradation in signal quality is noticable. How bad is the resolution of your VCR depends on particular model. But x effective "pixels" sound reasonable.

Let me enphasize what I mean by effective "pixels". An average person looking at the signal played by consumer-grade VCR on standard TV and at x resolution picture played on progressive PC monitor will make a conclision that both pictures have the same resolution The fact that VHS signal has some particular effective resolution doesn't mean that your capturing resolution should be the same.

In vertical direction the choice is clear. Either you capture at full for NTSC or half. In horizontal direction your signal is purely analog and the capturing process represents the convolution of video signal with the sampling voltage of the capture card. Last edited by Xesdeeni; 24th September at Great thread.

This will make it into the FAQ. Thanks to everyone for their nice discussion. All the best, Mijo. TV distinction in "compared results" The experiment I described in my previous post was quite similar. But instead of recording an artificial pattern I captured a 2 min movie fragment with horizontal and vertical elongated contrast images like contrast wall corners.

As for huge descrepancy in vertical resolution, it can probably be explained by the fact that you captured a coherent test pattern which is important in the direction parallel to scan lines and I captured a "natural object" from a movie.

You are going to beat your brains in unless you like that getting the quality that you want. A recorder IS the way to go to get perfect quality. Handyguy, I was wanting to know if you know of an application that would put closed captioning on a VHS to DVD home video or otherwise. I have converted my home movies over and I want my brother, who is deaf, to have the benefit of any talking that goes on in the home movie. Or if I were to back up a commercial VHS tape. I figure that when I reauthor, I can add that as subtext, but was wanting to know if you know of anything that could also do it.

Although it's an old thread this might help other: If you try to capture without compressing you might run into HD bottleneck at higher resolutions, if you use a slow compressor h CPU will be the bottleneck. The key is to use half vertical size VHS only have half of vertical anyway , that will save a lot of realtime process and will avoid all interlacing problems no need to deinterlace later.

With that limited resolution you shouldn't have drop frames. Later you can resize and save to a better compression format like h or h Originally Posted by isidro. The key is to use half vertical size VHS only have half of vertical anyway. VCR records full video frame i. Horizontal bandwidth not resolution however resolution is related to bandwidth is around 2 - 3MHz max for non S-Video capable VCR and around 4.

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