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Image scaling in the compressed domain

An image and pixel value technology, applied in the direction of image communication, image data processing, graphics and image conversion, etc., can solve the problem of no teaching, no teaching reduction, etc.

Inactive Publication Date: 2004-08-25
SEIKO EPSON CORP
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Problems solved by technology

[0003] Although downscaling by factors of 1 / 2, 1 / 4, and 1 / 8 in the compressed domain has been previously proposed in U.S. Patent No. 5,708,732, this patent does not teach downscaling by all factors of the form k / 8 (for 1≤k ≤8), including 3 / 8, 5 / 8, 3 / 4, 7 / 8
Also, this prior patent does not teach that by using the formula X=(k / 8)D k T Y k D. k A downscaling technique to obtain a kxk block X of pixel values ​​from an 8x8 matrix Y of DCT coefficients, as described in this patent application

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  • Image scaling in the compressed domain
  • Image scaling in the compressed domain
  • Image scaling in the compressed domain

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Embodiment approach

[0034] Algorithm of the present invention can be implemented conveniently with software, and this software can be in Figure 4 An image processing system 40 of the type shown runs on it. like Figure 4As shown, the system includes a central processing unit (CPU) 41, which provides computing resources and controls the computer. CPU 41 may be implemented with a microprocessor or the like, and may also include a graphics processor and or a floating-point co-processor for mathematical calculations. System 40 also includes system memory 42, which may be in the form of random access memory (RAM) and read only memory (ROM).

[0035] like Figure 4 As shown, several controllers and peripherals are also provided. Input controller 43 represents an interface to one or more input devices 44, such as a keyboard, mouse or stylus. There is also a controller 45 which communicates with a scanner 46 or equivalent for digitizing documents containing graphics to be processed in accordance wi...

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Abstract

An efficient compressed-domain-based algorithm that works by combining the IDCT and pixel-domain averaging into a single compressed domain operation, where a part of the cost of even this simplified operation can be absorbed into the de-quantization process. The original image need not be decompressed fully, only to the point of extracting the transform coefficients. Compressed-domain scaling for all scales k / 8 for 1<=k<=8, including 3 / 8, 5 / 8, 3 / 4 , 7 / 8, is provided. By chaining multiple operations, any scale factors of the form k1k2 . . . kl / 8for integers ki's in the range [1,7] can be achieved.

Description

technical field [0001] The present invention relates to an effective compression domain for downscaling a JPEG digital image or any image / video content using a discrete cosine transform (DCT) by a factor of k / 8 (for any integer k in the range 1≤k≤8) algorithm. By chaining multiple such operations, one obtains that for an integer k in the range [1, 7] i is of the form k 1 k 2 ...k l / 8 l any conversion factor for . The algorithm can be implemented by various devices, methods, and programs of instructions (eg, software). Background technique [0002] Traditionally, downscaling of a compressed digital image is accomplished by fully decompressing the image followed by pixel domain averaging. Thus, this approach suffers from the overhead required for entropy coding, anti-aliasing, de-quantization, and inverse DCT (IDCT). [0003] Although downscaling by factors of 1 / 2, 1 / 4, and 1 / 8 in the compressed domain has been previously proposed in U.S. Patent No. 5,708,732, this pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/40
CPCG06T3/4023
Inventor V·巴斯卡兰V·拉特纳卡
Owner SEIKO EPSON CORP
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