4. A digital camera's image quality is determined by three
main elements ( lens performance, CCD image sensor pixel
count and performance, and image processing engine
performance ).
FIGURE 2
5. As figure1, Simply converting an analog image that is captured
by the CCD (Charge-coupled Device) into digital data does not
create a digital image, and (CCD) is a device for the movement
of electrical charge and usually charge can be manipulated, for
example conversion into a digital value.
Only after the image processing engine performs a variety of
calculations on a huge amount of digital image data can we see
a completed color image.
Since this processing is directly related to( color accuracy, image
detail and shooting performance) , it ultimately determines the
digital camera's performance level.
6. The image processing engine :
Its important part, because its represent the heart of digital
camera Processing, called media processor. Is a
specialized digital signal processor (DSP) used for image
processing in digital cameras, mobile phones or other
devices.
Image processors often employ parallel computing. can
perform a range of tasks. To increase the system integration
on embedded devices, often it is a system on a
chip with multi-core processor architecture.
digital image processing has many advantages. It allows a
much wider range of algorithms to be applied to the input
data and can avoid problems such as the build-up of noise
and signal distortion during processing. Since images are
defined over two dimensions (perhaps more) .
7. What is Raw Mode?
Whenever the (CCD ) (records) the amount of light that has
hit each pixel. This is recorded as a voltage level. now
changes this analog voltage signal into a digital
representation. Depending on the camera's circuitry either
12 or 14 bits of data are recorded. Incidentally, if the
camera records 12 bits of data then each pixel can handle
4,096 brightness levels (2^12), and if 14 bit then it can
record 16,384 different brightness levels (2^14).…And so on
•Now one of two things can be done with the RAW data.
It can be stored on the memory card, or it can be further
processed to yield a JPEG image as 24 bits .
•
8. •Compression is attempts to find ways to reduce the size
of data to decrease the amount of memory that it
requires .
•1)LSL there has always been a restriction on memory a
script may use, and when sending data between
objects, or to external services then compression may be
considered as a way of packing more data into a single
message, or reducing the overall size of your messages.
2) TIFF files are very high quality–much higher quality than
most JPEG( Joint Photographic Experts Group)
so they’re big. When it comes to TIFF, two main compression
options are available–they’re known as LZW or ZIP. Both ZIP
and LZW are lossless compression methods. That means that
no data is being lost in the compression, unlike a lossy format
like JPEG, the JPEG is a commonly used method of lossy
compression for digital photography.
9. Digital Camera Shooting Speed
As shown in the figure 1, the speed of a digital camera is
determined by its image processing engine and
compression performance.
The High-performance digital cameras that has less
time lag (the time when the shutter is pressed to when
the image is actually recorded)and so its a shorter
shooting interval .
