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2368results about How to "Increase the compression ratio" patented technology

Adaptive compression and decompression of bandlimited signals

An efficient method for compressing sampled analog signals in real time, without loss, or at a user-specified rate or distortion level, is described. The present invention is particularly effective for compressing and decompressing high-speed, bandlimited analog signals that are not appropriately or effectively compressed by prior art speech, audio, image, and video compression algorithms due to various limitations of such prior art compression solutions. The present invention's preprocessor apparatus measures one or more signal parameters and, under program control, appropriately modifies the preprocessor input signal to create one or more preprocessor output signals that are more effectively compressed by a follow-on compressor. In many instances, the follow-on compressor operates most effectively when its input signal is at baseband. The compressor creates a stream of compressed data tokens and compression control parameters that represent the original sampled input signal using fewer bits. The decompression subsystem uses a decompressor to decompress the stream of compressed data tokens and compression control parameters. After decompression, the decompressor output signal is processed by a post-processor, which reverses the operations of the preprocessor during compression, generating a postprocessed signal that exactly matches (during lossless compression) or approximates (during lossy compression) the original sampled input signal. Parallel processing implementations of both the compression and decompression subsystems are described that can operate at higher sampling rates when compared to the sampling rates of a single compression or decompression subsystem. In addition to providing the benefits of real-time compression and decompression to a new, general class of sampled data users who previously could not obtain benefits from compression, the present invention also enhances the performance of test and measurement equipment (oscilloscopes, signal generators, spectrum analyzers, logic analyzers, etc.), busses and networks carrying sampled data, and data converters (A/D and D/A converters).

Digital camera device and methodology for distributed processing and wireless transmission of digital images

A digital imaging system is described that provides techniques for reducing the amount of processing power required by a given digital camera device and for reducing the bandwidth required for transmitting image information to a target platform. The system defers and/or distributes the processing between the digital imager (i.e., digital camera itself) and the target platform that the digital imager will ultimately be connected to. In this manner, the system is able to decrease the actual computation that occurs at the digital imager. Instead, the system only performs a partial computation at the digital imager device and completes the computation somewhere else, such as at a target computing device (e.g., desktop computer) where time and size are not an issue (relative to the imager). By deferring resource-intensive computations, the present invention substantially reduces the processor requirements and concomitant battery requirements for digital cameras. Further, by adopting an image strategy optimized for compression (compressed luminosity record), the present invention decreases the bandwidth requirements for transmitting images, thereby facilitating the wireless transmission of digital camera images.

Real-time image compression and reduction method based on plurality of palettes

The invention discloses a real-time image compression and reduction method based on a plurality of palettes. The real-time image compression and reduction method comprises the following steps of: preassembling and fixing the palettes, cutting a source image into blocks with a fixed size, reading an RGB (Red-Green-Blue) color value of each pixel point of each block, then carrying out color space transformation on the color values, and carrying out statistics on color systems of the images by a color histogram based on main colors; then carrying out color value matching according to color system palettes corresponding to the color systems, and finding the best palette; then replacing the value of each pixel point of the image into an index number of the palettes, and carrying out recompression on the indexed data, thus reaching a higher compression rate; and in transmission on a network, only transmitting the indexed data after compression without transmitting palette data of the color systems, thus achieving the purpose of reducing transmission of data amount. A receiving end only needs to decompress the data, obtain the indexed data, then carry out image data reduction according to the palettes of the local color system and then display the data.
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