Does your company need to find an MTF Testing provider. After you’ve selected a particular provider, you should also know about how to read the test results.
MTF might seem to be very complex, but it can still be understood by non-technical people. MTF stands for “modification transfer function.” It’s used to measure optical performance of a particular lens. To put it another way, MTF shows how well a lens can resolve detail as well as transmit contrast. That’s when light colors remain light while the dark colors remain dark.
MTF refers to change. It’s better in the case the lens doesn’t adjust the light or soften the various details that are transmitted. However, this is a goal that can never be reached and no lens in the world has an MTF score that’s 100% perfect.
MTF is frequently tested via using a bar chart. Black/white bars are thick parallel lines that are printed/projected with widths that are quite specific. They’re measured in line pairs. Those are a bar with each color per millimeter. The test patterns are set via a lens and metrics are used to measure the output.
The light transmission that’s 100% perfect would result in the result of an image being either completely black or white where the particular measurement is made and would produce the result of a particular bar chart. The measurement performed at the center of each and every black/white bar would reveal the chart’s total brightness difference for a perfect score (1.0).
The very sharp transitions positioned on the chart equal sharp transitions within the imagine details. It’s very important to remember that no perfection in the optics world exists.
A lens has a certain percentage of blur and lower measurements of contrast. As the blur increases, the white/black bars begin to merge and blur together. That result of this action is no pure white/black regions. The difference between the bright/dark regions decreases. The graph of brightness values on the image converts into a sine wave that has a much lower amplitude.
The result’s ratio of the move from brightness to darkness differs when compared to the original results contained in the MTF value. Pixel brightness is utilized to show that the Bar Chart example contains levels of brightness that have a range from 0 to 255. It results in a total difference of 98.
If you take the step of dividing 98 by 255, it shows MTF of 38. That at a 10 line pairs/picture height. If you make the black/white bars thinner as well as combine the black and white colors faster in the result it boosts the line pairs/millimeter. Meanwhile, the spatial frequency decreases the MTF score.
It’s very important to keep in mind that several different charts are available for MTF tests. One chart indicates the average results for a particular lens, and the other one indicates the variance within a lens model.
It’s very important to learn as much as possible about MTF testing before it’s conducted. This will help you to know what to expect, how to read the results, etc. There are various online sites where this service is offered, which will make the process easier. Make sure to find a top-notch company to get the best results.