aragon asked in Consumer ElectronicsCameras · 8 years ago

# how to calculate the pixel size?

I have image size of diagonal 8.923mm(type 1/1.8), total number of pixels 1600x1200, chip size 8.50mm(H) x 6.80mm(v).

How to calculate the pixel size or pixel distance?

Relevance
• 8 years ago

The math is really not that hard. The width of the chip (assuming your figures) divided by the number of pixels is 8.923mm/1600 = 0.005779mm (rounded to 4 significant figures) per pixel domain. The height of the chip divided by the number of pixels is 6.80mm/1200 = 0.005667mm (rounded to 4 sig places).

The actual pixel size will be smaller to accommodate inter-pixel spacing and on conventional sensors the read electronics and data tracks.

It's also common that the stated number of pixels is slightly higher than stated, such that the pixels are actually square, but a small number at the edge of one or both of the axis are unused.

*other contributors, beware getting mega-bit and mega-pixel confused.

• Rose Nipa4 years agoReport

there are two numbers i.e. 0.005779mm and 0.005667mm. so which one is the real size of each pixel on a sensor. if a sensor has 6000*4000 pixel with 0.5 inch diagonal, 3:2 ratio, what will be the size of each pixel?

• 8 years ago

Hi pixel size is or should be not an issue these days with some of the photo software the higher the resolution the better for a quality picture which can be enlarged.

so if this is for printed pictures as high as camera will allow.

but if it is just for viewing on a phone then the minimum is all that is needed, remember the smaller the pixel capture the more pictures on a sd card within the phone. the same is true for a camera

so lots of pictures and low resolution so when you look in the view finder it will tell you how many you can get and it usually keeps a count of what you can take and how many frames you have left.

it all comes with use you will soon get to grips with it.

Source(s): yes back in 1997 when ccd cameras first came into being pixel size meant the format of the finished picture from a 1.2meg bit picture was the size of a bill board so now with modern softwarfe this should not be an issue.
• 8 years ago

You really can't. Tell your teacher he is being too simplistic, and it is impossible to know without knowing the architecture of the sensor. The entire surface of a sensor is not pixels, it also includes wiring and border areas.

One of the recent advances in sensor technology is called "back-illuminated" which is a fairly strange term as it means that the wiring to each pixel (or pixel group) is on an underlying layer of the sensor rather than the top layer. This means that the space used by the wiring can now be use to gather more light (which in effect means larger individual pixel areas are used).

So whether the wiring is back-side or matrix will affect the size of each individual pixel.

• 8 years ago

Use math.