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JPEG Image Compression: DCT Transform

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Questions and Answers

What is the primary reason for the effectiveness of the DCT transform coding method in JPEG?

The ability of humans to notice high spatial frequency components
The visual acuity in distinguishing closely spaced lines
The high accuracy in distinguishing gray and chroma
The spatial redundancy in images due to slowly changing content (correct)

What is the result of reducing high spatial frequency contents in an image?

Increased accuracy in distinguishing closely spaced lines
Improved visual acuity in distinguishing gray and chroma
Reduced spatial redundancy (correct)
Increased spatial redundancy

What is the purpose of chroma subsampling in JPEG?

To improve the visual acuity in distinguishing gray and chroma
To reduce the amount of data required to store an image (correct)
To reduce the spatial redundancy in an image
To increase the accuracy in distinguishing closely spaced lines

What do psychophysical experiments suggest about human perception of image quality?

Humans are less likely to notice the loss of high spatial frequency components (A) Signup and view all the answers

What is the typical block size used in the DCT transform coding method in JPEG?

8 × 8 (B) Signup and view all the answers

What is the primary reason for the spatial redundancy in images?

Much of the information in an image is repeated. (C) Signup and view all the answers

Which of the following statements is a direct consequence of Observation 1?

Much of the information in an image is repeated. (D) Signup and view all the answers

What is the main purpose of reducing high spatial frequency components in an image?

To reduce the spatial redundancy in the image. (C) Signup and view all the answers

Which of the following is a direct application of Observation 2?

Reducing high spatial frequency components in an image. (A) Signup and view all the answers

What is the main reason for using chroma subsampling in JPEG?

To take advantage of human visual system's limited acuity for color. (D) Signup and view all the answers