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
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.
In addition to good light sensitivity, another key feature of digital image capture is progressive scan technology.
Resolution is similar in the analogue or digital worlds, but there are important differences in how it is defined.