highest megapixel camera wiki image
Denny Firs
I'd like to record my fishing adventures. :D good reviews and I'd prefer if it's in stores around me. I have Walmart , Best Buy, Sears , target, and Costco. Thanks !
Answer
AWBoater provided an interesting (and good) list, but I sort of have to disagree with one thing...
He said, "One has to assume that if sensor sizes are not specified, they must be at a disadvantage"... assuming you want to capture video, not stills, if the sensor is more than 3 megapixels for video doing 720 or 1080 horizontal lines of video resolution, you don't need much more in the way of more megapixels...
standard definition, 4:3 aspect ratio, video = 640 x 480 = 307,200 or almost 1/3 of a megapixel.
high definition at 720 horizontal rows = 1280 x 720 = 921,600 or almost 1 megapixel.
high definition at 1080 horizontal rows = 1920 x 1080 = 2,073,600 or a little over 2 megapixels.
http://en.wikipedia.org/wiki/Video_resolution
In addition to horizontal line count, the amount of compression applied to the video data stream during capture has a HUGE impact (if you can, compare 1080p video at a 25 mbps to 1080p video at 7mbps using the same LARGE monitor or HDTV and fill the screen for playback - both will look fine on a small cell-phone screen...).
Megapixel count is more of a measurement of still image resolution. Assuming the manufacturer did not specify megapixel count may mean they know their equipment is not appropriate to capture high resolution still images, but we found two paragraphs ago, that does not matter for video.
Other helmet cams worth a look:
http://www.tachyoninc.com
http://vio-pov.com
http://usa.ioncamera.com
Most likely the GoPro family and Coutour will be the most "available" given the list of stores you provided.
AWBoater provided an interesting (and good) list, but I sort of have to disagree with one thing...
He said, "One has to assume that if sensor sizes are not specified, they must be at a disadvantage"... assuming you want to capture video, not stills, if the sensor is more than 3 megapixels for video doing 720 or 1080 horizontal lines of video resolution, you don't need much more in the way of more megapixels...
standard definition, 4:3 aspect ratio, video = 640 x 480 = 307,200 or almost 1/3 of a megapixel.
high definition at 720 horizontal rows = 1280 x 720 = 921,600 or almost 1 megapixel.
high definition at 1080 horizontal rows = 1920 x 1080 = 2,073,600 or a little over 2 megapixels.
http://en.wikipedia.org/wiki/Video_resolution
In addition to horizontal line count, the amount of compression applied to the video data stream during capture has a HUGE impact (if you can, compare 1080p video at a 25 mbps to 1080p video at 7mbps using the same LARGE monitor or HDTV and fill the screen for playback - both will look fine on a small cell-phone screen...).
Megapixel count is more of a measurement of still image resolution. Assuming the manufacturer did not specify megapixel count may mean they know their equipment is not appropriate to capture high resolution still images, but we found two paragraphs ago, that does not matter for video.
Other helmet cams worth a look:
http://www.tachyoninc.com
http://vio-pov.com
http://usa.ioncamera.com
Most likely the GoPro family and Coutour will be the most "available" given the list of stores you provided.
What do those camcorder sensor numbers mean?
Doug
I just bought a Sony HDRPJ260V. Manual says it has a 1/3.91 type, 4.2 mm sensor. 4.2 mm I hear means the diagonal of the image sensor. A Canon HF R300 camcorder has a 1/4.85 sensor. How can I tell what the diagonal is (isn't this the important thing, surface area of the sensor, one with 2X area should be 2X as good all other factors equal)? Should these numbers be proportional i.e. 4.2/(1/3.91)=X/(1/4.85)?
Seems like the manufacturers have conspired to purposely give you info that means nothing to you...or give you useful info but then conspire to not tell you how to interpret it. This reminds me of the megapixel hype nonsense in mini digital cameras but in reverse (manufacturers found higher MP ratings sold more cameras but more pixels in same size sensor does NOT necessarily mean a better image).
Answer
Hi again, Doug:
The diagonal measurement on camcorder & camera sensors can sound a lot like the TV marketing hype used for television set sizes (also measured diagonally, to sound "bigger").
Just like raw Megapixels specifications, the sensor size specs are only useful to a certain point. There are other minutiae like individual pixel size (in microns), Bayer color filter design, CCD versus CMOS, etc. Larger sensors can capture more light, helping with low-light sensitivity without "noise artifacts". But individual manufacturer's design & circuitry can affect this "signal to noise" ratio, as well as image detail.
The actual tradition of the diagonal measurement spec for video sensors dates back to the days of Vidicon & Plumicon imaging tubes (which were round). These were measured by diameter (1/2", 2/3", etc.) which if you draw the rectangular TV frame on it is approximately the same as the box's diagonal size. What makes it even more confusing is the practice of "improper fractions" (e.g., 1/3.91", instead of 1/4" which --heaven forbid!-- is 0.09" smaller).
You can peruse the excellent Wikipedia chart listing common sensor sizes (both diagonal & HxW meansurements): http://en.wikipedia.org/wiki/Sensor_sizes#Table_of_sensor_formats_and_sizes One of the more illuminating (no pun intended) parts of the article text says,
"sensor areas... are proportional to the maximum possible collection
of light and image resolution [other things equal], but in practice are
not directly proportional to image noise or resolution due to other limitations."
You really have to look at 3rd party reviews (CNet, DP Review, Consumer Reports, etc.) to compare low-light image quality and lens/sensor image fidelity. Printed specs are a mere guideline, but you also have to "consider the source" when shopping.
hope this helps,
--Dennis C.
Â
Hi again, Doug:
The diagonal measurement on camcorder & camera sensors can sound a lot like the TV marketing hype used for television set sizes (also measured diagonally, to sound "bigger").
Just like raw Megapixels specifications, the sensor size specs are only useful to a certain point. There are other minutiae like individual pixel size (in microns), Bayer color filter design, CCD versus CMOS, etc. Larger sensors can capture more light, helping with low-light sensitivity without "noise artifacts". But individual manufacturer's design & circuitry can affect this "signal to noise" ratio, as well as image detail.
The actual tradition of the diagonal measurement spec for video sensors dates back to the days of Vidicon & Plumicon imaging tubes (which were round). These were measured by diameter (1/2", 2/3", etc.) which if you draw the rectangular TV frame on it is approximately the same as the box's diagonal size. What makes it even more confusing is the practice of "improper fractions" (e.g., 1/3.91", instead of 1/4" which --heaven forbid!-- is 0.09" smaller).
You can peruse the excellent Wikipedia chart listing common sensor sizes (both diagonal & HxW meansurements): http://en.wikipedia.org/wiki/Sensor_sizes#Table_of_sensor_formats_and_sizes One of the more illuminating (no pun intended) parts of the article text says,
"sensor areas... are proportional to the maximum possible collection
of light and image resolution [other things equal], but in practice are
not directly proportional to image noise or resolution due to other limitations."
You really have to look at 3rd party reviews (CNet, DP Review, Consumer Reports, etc.) to compare low-light image quality and lens/sensor image fidelity. Printed specs are a mere guideline, but you also have to "consider the source" when shopping.
hope this helps,
--Dennis C.
Â
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