312-49 · Question #90
JPEG is a commonly used method of compressing photographic Images. It uses a compression algorithm to minimize the size of the natural image, without affecting the quality of the image. The JPEG…
The correct answer is B. 8x8 pixels. The JPEG compression algorithm works by dividing an image into non-overlapping blocks of 8x8 pixels. Each 8x8 block is then processed independently using the Discrete Cosine Transform (DCT), which converts the spatial pixel data into frequency domain components. High-frequency…
Question
JPEG is a commonly used method of compressing photographic Images. It uses a compression algorithm to minimize the size of the natural image, without affecting the quality of the image. The JPEG lossy algorithm divides the image in separate blocks of____________.
Options
- A4x4 pixels
- B8x8 pixels
- C16x16 pixels
- D32x32 pixels
How the community answered
(63 responses)- A2% (1)
- B86% (54)
- C8% (5)
- D5% (3)
Explanation
The JPEG compression algorithm works by dividing an image into non-overlapping blocks of 8x8 pixels. Each 8x8 block is then processed independently using the Discrete Cosine Transform (DCT), which converts the spatial pixel data into frequency domain components. High-frequency components (fine detail) are then quantized (reduced in precision) more aggressively than low-frequency components (broad color areas), which is the source of the 'lossy' compression. This 8x8 block size is a fundamental characteristic of the JPEG standard (ISO/IEC 10918-1) and is why JPEG artifacts often appear as visible 8x8 tile-like blocks at high compression levels.
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