BobDiaz
Well-Known Member
This is my first post on this forum and by way of introduction I'm looking at several possible choices in a car cam.
In looking at the DVR 27 and DVR 207 the image seems soft and falls short of the true 1280x720 resolution. In an experiment I covered some of the 1280x720 YouTube videos from the 27 & 207 to 852x480. After the conversion, the image looked sharp at the lower resolution. This led me to wonder if the units really have a 852x480 EDTV image sensor, rather than a true 1280x720 HD image sensor.
IF they put the lower resolution sensor, it would cost less and they could generate an up-converted 1280x720 for recording. Magnifying the image by 1.5x would not give any more detail and would result in a fuzzy 1280x720 picture.
I notice in the specifications that the camera does have a 848x480 recording mode. I assume that they chose 848 rather than 854 because 848 is evenly divisible by 8, something important in the compression process.
If my theory is correct, there should be no difference in sharpness between an 848x480 recording stretched to 1280x720 and a recording at 1280x720. Just wondering if anyone would like to try the experiment and post their results or if anyone agrees or disagrees with my theory.
Thanks,
Bob Diaz
In looking at the DVR 27 and DVR 207 the image seems soft and falls short of the true 1280x720 resolution. In an experiment I covered some of the 1280x720 YouTube videos from the 27 & 207 to 852x480. After the conversion, the image looked sharp at the lower resolution. This led me to wonder if the units really have a 852x480 EDTV image sensor, rather than a true 1280x720 HD image sensor.
IF they put the lower resolution sensor, it would cost less and they could generate an up-converted 1280x720 for recording. Magnifying the image by 1.5x would not give any more detail and would result in a fuzzy 1280x720 picture.
I notice in the specifications that the camera does have a 848x480 recording mode. I assume that they chose 848 rather than 854 because 848 is evenly divisible by 8, something important in the compression process.
If my theory is correct, there should be no difference in sharpness between an 848x480 recording stretched to 1280x720 and a recording at 1280x720. Just wondering if anyone would like to try the experiment and post their results or if anyone agrees or disagrees with my theory.
Thanks,
Bob Diaz