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Method of compression and recompression image data for image acquiring apparatus

An image capturing device and technology for image data, applied in the data conversion field of image capturing device compressing and decompressing image data, can solve problems such as performance storage space bottleneck, and achieve the effect of improving image quality

Inactive Publication Date: 2008-09-24
ALCORLINK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the excessive number of bits used to perform the discrete cosine transform, resulting in bottlenecks in performance and storage space, it is necessary to use a conversion method in the time domain and frequency domain that uses fewer bits.

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  • Method of compression and recompression image data for image acquiring apparatus
  • Method of compression and recompression image data for image acquiring apparatus
  • Method of compression and recompression image data for image acquiring apparatus

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Embodiment Construction

[0038] Please refer to FIG. 1 . FIG. 1 is a schematic diagram of a channel differential coding system 100 for performing channel differential coding according to the present invention. The channel differential encoding system 100 can generate a differential encoding group by subtracting a green pixel group and a non-green pixel group, or directly output a green pixel group. The channel differential coding system 100 includes four subtractors 125, four multiplexers 127, four input nodes 101, 103, 105, 107 for non-green pixel parameters, and four input nodes 109, 111, 113 for green pixel parameters , 115, and four output nodes 117, 119, 121, 123. Each subtractor 125 is connected to the input node of the non-green pixel parameter and the input node of the green pixel parameter, and is used for subtracting the non-green pixel parameter and the green pixel parameter, so four subtractors 125 can output a differential code group. Under the control of the multiplexer 127, the channe...

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Abstract

The invention provides a method for compressing and decompressing image data for an image shooting device, comprising the steps of: generating a differential code group, making MHT (Modified Hadamard Transform) on the differential code group to generate low-frequency parameters and plural high-frequency parameters, regulating low-frequency parameters and regulating high-frequency parameters according to a quantization index, reducing the low-frequency parameters and reducing the high- frequency parameters according to the quantization index, and making IMHT (Inverse Modified Hadamard Transform) on the low-frequency and high- frequency parameters to reduce the differential code group.

Description

technical field [0001] The invention provides a data conversion method, especially a data conversion method for compressing and decompressing image data in an image capture device. Background technique [0002] The back-end chip of the camera usually contains a large buffer to temporarily store the data required for the operation, so as to complete the operation required by the two-dimensional data. However, in general chips, the area occupied by this buffer is often too large, so that a lot of production costs and burdens on use are increased; if the image quality seen by the naked eye is acceptable, using the image Compression technology reduces the size of the buffer, and the area of ​​the chip is also greatly reduced, making the chip more convenient to use and reducing the production cost. The techniques used to implement image compression techniques in existing technologies usually include adaptive difference pulse coding method (Adaptive difference pulse coding) and d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/917
Inventor 纪富中林秉衡
Owner ALCORLINK CORP