A true or false question
1. Computers can only process digital information. Therefore, all multimedia information must be converted into digital information and then processed by the computer. (✓)
2. After the media information is digitized, the volume is reduced and the amount of information is also reduced. (×)
Constant amount of information
3. Display resolution is also called image resolution. (×)
Display resolution (screen resolution) is the precision of the screen image, which refers to how many pixels the monitor can display.
Image resolution is the number of pixels contained in a unit inch, and its definition is closer to the definition of resolution itself.
4. Convert BMP to JPG format, the file size is basically unchanged. (×)
Getting smaller
5. Binary only uses two digital symbols "1" and "2". (×)
0101010101010101
6. The computer uses lossy compression for files, which can compress files smaller and reduce storage space. (✓)
7. Image resolution refers to the number of pixels in the horizontal and vertical directions of the image. (✓)
8. In audio digital processing technology, sampling frequency must be considered. The coding problem of quantization series. (✓)
9. For audio digitization, under the same conditions, stereo occupies more space than mono. The higher the quantization level, the smaller the space, and the higher the sampling frequency, the larger the space. (×)
The higher the quantization level, the larger the space occupied
10. The JPEG standard is suitable for still images, and the MPEG standard is suitable for moving images. (✓)
11. The photosensitive device of a digital camera is a photoelectric coupling device (CCD). (✓)
12. In multimedia systems, image compression is mainly achieved by eliminating data redundancy caused by the relevance of images in space and time. (✓)
13. The function of OCR software is to convert vectorized text into recognizable text in electronic documents. (×)
Vectorized text = informationized characters X
text on pictures √
14. In the process of acquiring and processing digital video information, the correct order is sampling. D/A conversion. compression. storage. unzip. A/D conversion. (×)
Sampling, A/D conversion, compression, storage, decompression, D/A conversion
15. The image quality will not be reduced after the vector graphics are enlarged. (✓)
16. Images compressed by the JPEG standard generally have a loss in image quality. (×)
QwQ ？？？
17. Images in BMP format are converted to JPG format, and the file size is basically unchanged. (×)
Getting smaller
18. A bitmap image is displayed on the same monitor. The larger the monitor display resolution is set, the smaller the image display range. (✓)
19. Computers can only process digital information. Therefore, all multimedia information must be converted into digital information and then processed by the computer. (✓)
20. Color is the result of the human visual system's perception of visible light, and the perceived color is determined by the frequency of the wavelength. (✓)
21. The deeper the saturation, the purer the color; after adding white light, the color becomes variable and the saturation decreases. (✓)
22. Color space is one of the methods of organizing and describing colors. The digital method of representing colors can also be called a color model. (✓)
23. The NTSC system is a color television broadcasting standard defined by the National Television Standards Committee in 1962. (✓)
Two multiple choice questions
1. Two-minute dual-channel, 16-bit sampling number, 22.05kHz sampling frequency, the uncompressed data volume of sound is (D):
(A) 5.05MB
(B) 10.58MB
(C) 10.35MB
(D) 10.09MB
2min*2*(number of channels)* 16*22.05KHz/8bit=10.09MB
2. The sound quality of the following collected waveforms is the best (D):
(A) mono, 8-bit quantization, 22.05 kHz sampling frequency
(B) dual-channel, 8-bit quantization, 44.1 kHz sampling frequency
(C) single Channel, 16-bit quantization, 22.05 kHz sampling frequency
(D) Dual channel, 16-bit quantization, 44.1 kHz sampling frequency
3. Internationally commonly used television systems are (C):
(1) PAL system (2) NTSC system (3) SECAM system (4) MPEG
(A) (1)
(B) (1) (2)
(C) (1) (2) (3)
(D) all
4. Which of the following digital videos has the best quality (C):
(A) 240x180 resolution, 24-bit true color, 15 frames per second frame rate
(B) 320x240 resolution, 30-bit true color, 25 frames per second Frame rate
(C) 320x240 resolution, 30-bit true color, 30 frames/second frame rate
(D) 640×480 resolution, 16-bit true color, 15 frames/second frame rate
Strange, the frame rate is more important when the size is similar (◔◡◔)
5. For two adjacent images in the image sequence, there is a greater correlation between the latter image and the previous image, which is (B);
(A) spatial redundancy
(B) temporal redundancy More
(C) information redundancy
(D) visual redundancy
6. Which of the following statements is correct (C):
(A) The amount of information is equal to the sum of the amount of data and the amount of redundancy
(B) The amount of information is equal to the difference between the amount of information and the amount of data
(C) The amount of information is equal to the amount of data and The difference of redundancy
(D) The amount of information is equal to the sum of information and redundancy
The amount of data itself contains the amount of redundancy, and the amount of redundancy is useless repetitive information, which cannot be counted into the amount of information
7. In order to improve the data compression ratio in MPEG, which methods are used (C):
(A) Motion compensation and running estimation
(B) Reduce temporal and spatial redundancy
(C) Intra-frame image data and inter-frame Image data compression
(D) forward prediction and backward prediction
8. Which two coding methods are used in JPEG (D):
(A) Statistical coding and arithmetic coding
(B) PCM coding and DPCM coding
(C) predictive coding and transform coding
(D) Huffman coding and self Adapt to binary arithmetic coding
9. The following are not video file extensions (B).
A, FLV
B, WAV
C, MPEG
D, AVI
WAV is one of the most common sound file formats. It is a standard digital audio file specially developed by Microsoft for Windows. This file can record various mono or stereo sound information and ensure that the sound is not distorted.
10. The following are all audio file extensions (B).
A, BMP, MID, XLS
B, MID, WAV, MP3
C, WAV , DOC, JPG
D, AVI, GlF, MP3
BMP, JPG, GIF: Image
MID, WAV, MP3: Audio
XLS: Excel
DOC: Word
AVI: Video
11. Data compression can be compressed because of (B). ①Various
kinds of redundancy in multimedia information
②Human visual characteristics ③Human hearing characteristics ④Massive characteristics of multimedia data A. ①②③④
B. ①②③
C. ②③④(⑤)
D. ②③
I don’t know what ⑤ is QwQ
12. Multimedia data has (D) characteristics.
A. Large amount of data and many types of data
B. Big difference between data types and less data types
C. Large amount of data, many data types, small differences between data types, uncomplicated input and output
D. Large amount of data, many data types, big differences between data types, complex input and output
13. Comparing the bitmap with the vector diagram, you can see (C).
A. Bitmaps take up less space than vector graphics
B. Bitmap and vector graphics occupy the same space
C. For complex graphics, bitmaps are faster than vector drawing objects
. D．For complex graphics, bitmaps are slower than vector drawing objects
14. Which of the following compression methods are redundant compression methods? (D)
(1) Huffman coding
(2) PCM
(3) run length coding
(4) Lempel-Zev coding
A. (1), (3)
B. (1), (2), (3)
C. (1), (2), (4)
D. (1), (3), (4)
15. The media information in the multimedia computer refers to (D).
(1) Numbers, text
(2) Sound, graphics
(3) Animation, video
(4) Image
A. (1)
B. (2)
C. (3)
D. All
16. In the process of acquiring and processing digital audio information, which of the following sequences is correct (C).
A. A/D conversion, sampling, compression, storage, decompression, D/A conversion.
B. Sampling, compression, A/D conversion, storage, decompression, D/A conversion.
C. Sampling, A/D conversion, compression, storage, decompression, D/A conversion.
D. Sampling, D/A conversion, compression, storage, decompression, A/D conversion.
17. The following (B) is not a common file format for digital graphics and images.
A, .BMP
B, .TXT
C, .GIF
D, .JPG
18. At present, dynamic image data compression is often used in multimedia computers (C)
A, JPEG
B, GIF
C, MPEG
D, BMP
19. The smallest unit of video information is (B).
A, ratio
B, frame
C, hertz
D, bit
20. The same disc with the same size, the largest storage information (C) Disc
A, LV
B, VCD
C, DVD
D, CD-DA
LV/CD/VCD/DVD
from small to large.
21. The various colors generated by the color printer are composed of (D) three-color subtraction model.
A, RVG (red, yellow, green)
B, WRG (white, red, green)
C, RGB (red, green, blue)
D, CMY (cyan, magenta, yellow)
twenty two. The following (A) is not a commonly used sound file format.
A, JPEG file
B, WAV file
C, MIDI file
D, VOC file
twenty three. The three elements of color include (A).
A, brightness, hue, saturation
B, brightness, hue, resolution
c, hue, saturation, resolution
D, brightness, saturation, resolution
24. JPEG is (A) image compression coding standard.
A, static
B, dynamic
C, dot matrix
D, vector
25. In China, a car has four wheels, the steering wheel is in front of the left seat in the front row, and the gear shifting device is on the right side of the seat. This regular structure is called (B)
A. Structural redundancy
B. Knowledge Redundancy
C. Visual redundancy
D. Spatial redundancy
26. my country's current digital interactive TV services are mainly provided by (C).
A. Mobile
B. Telecommunications
C. Radio and
TV D. Guodian
27. Taking the PAL system 25 frames/second as an example, it is known that the resolution of a frame of color static image (RGB) is 256*256, and each color is represented by 16bit. Then the data volume of the video per second is (A ).
A. 256*256*3*16*25 bps
B. 512*512*3*8*25 bps
C. 256*256*3*8*25 bps
D. 512*512*3*16*25 bps
28. In the RGB color mode, the color with R=G=B=0 is (B).
A. White
B. Black
C. Red
D. Blue
Three fill in the blanks
1. Multimedia data data compression coding methods can be divided into two categories: __lossy compression__ and __lossless compression__ .
2. The distortion JPEG encoding process based on DCT is shown in the figure below, please fill in the figure completely.
DCT, quantizer, entropy encoder, quantization table, entropy coding table
3. Representation of media information are: __ writing __, __ graphic images __, __ voice __, video and animation .
4. Chinese character input code, inner code, computer code for glyph __ enter __, __ internal processing __ __ and outputs __ codes for three different purposes.
5. The continuous analog signals into discrete digital signals over time time, taking this point a process called __ sampling __
hearing range of the human ear is 6. __ 20 is __ ~ __ Hz 2OK between __ Hz.
7. The CD surface is divided into __ lead-in area__ , data recording area and __ lead-out area__ .
8. The media composition of CD discs is divided into four layers, followed by __The protective layer __, __ aluminum reflective layer __, __ groove layer __ pad and polycarbonate.
__ 9.JPEG formulation suitable for continuous tone __, multi-tone, __ color international standards __ or monochrome still image data compression.
10. Quantization__ is the process of determining the value of the sampled sample's amplitude according to the quantization level, and its purpose is to discretize the sampled sample's amplitude value__.
11. Huffman encoding is __lossless compression__ encoding.
12. __ luminance __ refers to the brightness of light applied to the human eye caused by feeling.
13. __ tone __ represents the color of the light, which depends on the wavelength of the light.
__ 14. Saturation __ represents the degree of color depth, also referred to as the purity and chroma. Usually refers to the amount of white light in the color.
The image is digitized to a continuous __ spatial position __ __ and brightness __ discrete.
16. Human eyes have a kind of persistence of vision__ phenomenon, that is, after the object observed by people disappears, the image of the object will remain on the retina of the eye for a very short time (about 0.1 second).
17. A video image is called a single web __ frame __.
18. The NTSC TV system stipulates that the color mode is __ YIQ __ and the frame rate is __ 30 __ frames per second.
19. The PAL TV system stipulates that the color mode is __ YUV __ and the frame rate is __ 25 __ frames per second.
20.PAL TV system in 1962 __ German __ the development of color television broadcast standards.
21.SECAM TV system in 1965 __ French __ the development of color television broadcast standards, the same __ (2) similar __ standard.
22. HDTV is the __High Definition Television__ standard, with an aspect ratio of __ 16: 9__ .
__ 23. The image is discrete video __, __ video __ continuous image, __ frame __ is the smallest unit making up the video.