The most common reason for poor quality images is a lack of light. Generally, the more light, the better the image.
When comparing the performance of MPEG standards such as MPEG-4 and H.264, it is important to note that results may vary between encoders that use the same standard.
The are two basic compression standards; JPEG and MPEG
CCD (Charged Coupled Device) and CMOS (Complementary metal oxide semiconductor).
MPEG-4 is an ISO/IEC standard developed by MPEG (Moving Picture Experts Group), the committee that also developed the Emmy Award winning standards known as MPEG-1 and MPEG-2.
Resolution is similar in the analogue or digital worlds, but there are important differences in how it is defined.