D-Link DCS-1100 - mydlink-enabled Wired Network Camera Uživatelský manuál stáhnout pdf (Strana 29)

113

Summary

 Resolution specifies how much details an image can hold. The greater the

resolution, the higher the level of details and image quality.

 Compression are often performed for practical reasons to reduce the space

required for storage of large amount of data. Data compression can use

either lossy compression mechanism or lossless compression mechanism

to reduce the size of data, while at the same time providing good quality of

source.

 Compression standards include MJPEG, MPEG-4, and H.264 for video

data, and AMR, AAC, ADPCM for audio data.

IP Surveillance Essential

• Summary

114

Questions and Answers

1. What is one of the many advantages of CCD sensor over CMOS sensor?

a. CCD sensors create high quality and low noise images while CMOS

sensors are more susceptible to noise.

b. CCD sensors relatively need more effort to design the chip architecture,

while designing CMOS sensors are much easier.

c. CCD sensors show significant efficiency in power consumption as

compared to CMOS sensors which consumes more power.

d. CCD chips are extremely inexpensive as compared to CMOS sensor

because of its simple design of chip architecture.

2. Which of the following is the right sequence of video compression

computational requirement from the lowest to the highest?

a. MJPEG - MPEG-4 - H.264

b. H.264 – MPEG-4 – MJPEG

c. MPEG-4 – H.264 – MJPEG

d. MJPEG – H.264 – MPEG-4

IP Surveillance Essential

• IP Surveillance Essential Q&A

115

Questions and Answers

3. Which of the following are codecs used for audio compression? Choose

three.

a. AMR

b. ADPCM

c. AAC

d. AVC

4. What is the function of an image sensor inside a surveillance camera?

a. An image sensor captures the image that is seen through the lens by

registering the location, color, and intensity of light.

b. An image sensor is used to selectively transmit lights that meet some

particular parameter, while blocking the remainder.

c. Image sensor controls and coordinates the camera’s components.

d. An image sensor receives the digital signal captured by the camera and

compresses it into a chosen standard.

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