Difference between revisions of "Resolution"

Latest revision as of 00:07, 29 May 2014

Resolution

The resolution of a camera measures the amount of detail the camera’s images will pick up. In standard digital video, the resolution is measured in pixels. Our Camera's ability to display clear details, however, is a product of the 22x optical zoom and doesn't need the high resolution that a purely digital zoom camera would need.

A more old-fashioned way of looking at resolution involves looking at the lines of resolution. Analog transmission of a video signal is based on lines, and the TVL (TV lines) number represents how many lines can be resolved on a display (TV, VCR, etc.). Drawing a comparison between analog and digital measurements, the TVL will be approximately half the number of horizontal pixels. And, indeed, we see that the (H) pixels are 811 and the TVL measurement is 480.

480 TVL is about the same resolution you get from a VCR. Our camera doesn’t have a strong need for a high resolution because the image quality is already high. The quality and clarity of the image is brought to you by the 22x optical zoom. While standard digital video recording would simply crop and enlarge the image you wish to get a close-up on, ours will actually zoom in to bring you closer to the image, producing a much clearer image than could be achieved by simply raising the picture’s resolution.

Optical? Analog? Digital? What does this all mean?

Analog:

The principal feature of analog representations is that they are continuous. For example, clocks with hands are analog— the hands move continuously around the clock face. As the minute hand goes around, it not only touches the numbers 1 through 12, but also the infinite number of points in between. Similarly, our experience of the world, perceived in sight and sound, is analog. We perceive infinitely smooth gradations of light and shadow; infinitely smooth modulations of sound. Traditional (non-digital) video is analogue.

Digital:

In contrast to analog, digital representations consist of values measured at discrete intervals. Digital clocks go from one value to the next without displaying all intermediate values. Computers are digital machines employing a binary system, i.e., at their most basic level they can distinguish between just two values, 0 and 1 (off and on); there is no simple way to represent all the values in between, such as 0.25. All data that a computer processes must be digital, encoded as a series of zeroes and ones. Digital representations are approximations of analog events. They are useful because they are relatively easy to store and manipulate electronically.

Optical:

An optical sensor that turns the light coming through a digital camera lens into an electronic signal which can then be recorded onto tape is called a CCD (charge coupled device). The quality of video a digital video camera can produce depends on the amount of detail the CCD can detect. This detail, or resolution, is measured in pixels. The higher the number of pixels is, the cleaner and more detailed the video will be.

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-The '''resolution''' of a camera '''measures the amount of detail''' the camera’s images will pick up. In standard digital video, the resolution is measured in pixels. Our Camera's ability to display clear details, however, is a product of the '''22x optical zoom''' and doesn’t need the high resolution that a purely digital zoom camera would need.
+==Resolution==
+The '''resolution''' of a camera '''measures the amount of detail''' the camera’s images will pick up. In standard digital video, the resolution is measured in pixels. Our Camera's ability to display clear details, however, is a product of the '''22x optical zoom''' and doesn't need the high resolution that a purely digital zoom camera would need.
+A more ''old-fashioned'' way of looking at resolution involves looking at the lines of resolution. '''Analog transmission''' of a video signal is '''based on lines''', and the TVL (TV lines) number represents how many lines can be resolved on a display (TV, VCR, etc.). Drawing a comparison between analog and digital measurements, the TVL will be approximately half the number of horizontal pixels. And, indeed, we see that the (H) pixels are 811 and the TVL measurement is 480.
-==Optical?  Analog?  Digital?   What does this all mean?==
-===What's the difference between optical zoom and digital zoom?===
+TVL is about the same resolution you get from a VCR. Our camera doesn’t have a strong need for a high resolution because the image quality is already high. The quality and clarity of the image is brought to you by the 22x optical zoom. While standard digital video recording would simply crop and enlarge the image you wish to get a close-up on, ours will actually zoom in to bring you closer to the image, producing a much clearer image than could be achieved by simply raising the picture’s resolution.
-It's important to understand this difference, as you could end up mighty disappointed with the results if you get one rather than the other. '''Optical zoom''' is similar to what you'll find in a regular 35mm camera: When you push the button to zoom in or out, physical lens elements move inside the camera, to achieve the desired effect.
-'''Digital zoom''', on the other hand, has no moving parts. Using the "electronic brain" within the camera instead, the camera takes a look at what it's "looking at", and digitally zooms in, usually two or three times closer.
-The problem with digital zoom is that you lose quality when you do this -- your images will tend to be more "pixelated" than the same image taken with an optical zoom camera. This is due to the "interpolation" the camera uses, which is a nice way of saying that it makes a guess about how the picture should look while zoomed in.
+==Optical?  Analog?  Digital?   What does this all mean?==
-===Analogue:===
+===Analog:===
+The principal feature of analog representations is that they are continuous. For example, clocks with hands are analog— the hands move continuously around the clock face. As the minute hand goes around,  it not only touches the numbers 1 through 12, but also the infinite number of points in between. Similarly, our experience of the world, perceived in sight and sound, is analog. We perceive infinitely smooth gradations of light and shadow; infinitely smooth modulations of  sound. Traditional (non-digital) video is analogue.
-The principal feature of analogue representations is that they are continuous. For example, clocks with hands are analogue—the hands move continuously around the clock face. As the minute hand goes around,  it not only touches the numbers 1 through 12, but also the infinite number of points in between. Similarly, our experience of the world, perceived in sight and sound, is analogue. We perceive infinitely smooth gradations of light and shadow; infinitely smooth modulations of  sound. Traditional (non-digital) video is analogue.
 ===Digital:===
-In contrast to analogue, digital representations consist of values measured at discrete intervals. Digital clocks go from one value to the next without displaying all intermediate values. Computers are digital machines employing a binary system, i.e., at their most basic level they can distinguish between just two values, 0 and 1 (off and on); there is no simple way to represent all the values in between, such as 0.25. All data that a computer processes must be digital, encoded as a series of zeroes and ones.  Digital representations are approximations of analogue events. They are useful because they are relatively easy to store and manipulate electronically.
+In contrast to analog, digital representations consist of values measured at discrete intervals. Digital clocks go from one value to the next without displaying all intermediate values. Computers are digital machines employing a binary system, i.e., at their most basic level they can distinguish between just two values, 0 and 1 (off and on); there is no simple way to represent all the values in between, such as 0.25. All data that a computer processes must be digital, encoded as a series of zeroes and ones.  Digital representations are approximations of analog events. They are useful because they are relatively easy to store and manipulate electronically.
 ===Optical:===
-An optical sensor that turns the light coming through a digital camera lens into an electronic signal which can then be recorded onto tape is called a CCD (Charge-Coupled-device). The quality of video a digital video camera can produce depends on the amount of detail the CCD can detect. This detail, or resolution, is measured in pixels. The higher the number of pixels is, the cleaner and more detailed the video will be.
-A more ''old-fashioned'' way of looking at resolution involves looking at the lines of resolution. '''Analog transmission''' of a video signal is '''based on lines''', and the TVL (TV lines) number represents how many lines can be resolved on a display (TV, VCR, etc.). Drawing a comparison between analog and digital measurements, the TVL will be approximately half the number of horizontal pixels. And, indeed, we see that the (H) pixels are 811 and the TVL measurement is 480.
+An optical sensor that turns the light coming through a digital camera lens into an electronic signal which can then be recorded onto tape is called a CCD (charge coupled device). The quality of video a digital video camera can produce depends on the amount of detail the CCD can detect. This detail, or resolution, is measured in pixels. The higher the number of pixels is, the cleaner and more detailed the video will be.
-TVL is about the same resolution you get from a VCR. Our camera doesn’t have a strong need for a high resolution because the image quality is already high. The quality and clarity of the image is brought to you by the 22x optical zoom. While standard digital video recording would simply crop and enlarge the image you wish to get a close-up on, ours will actually zoom in to bring you closer to the image, producing a much clearer image than could be achieved by simply raising the picture’s resolution.
+[[Video_Calling_System|Return to Video Calling System Main Menu]]