共查询到17条相似文献,搜索用时 140 毫秒
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《红外技术》2016,(2)
为了解决空间遥感凝视型探测器获取的数据量巨大的问题,研究了红外图像的无损压缩。经比较,JPEG2000国际标准压缩算法具有较好的压缩性能且有相应的ASIC(Application Specific Integrated Circuit)芯片易于系统实现。本文对连续的红外图像序列的空间和时间相关性进行了分析,以此为基础提出了一种基于预测和JPEG2000算法相结合的无损压缩方案,并以ASIC和FPGA为平台实现了一个复杂度低、性能高的实时无损压缩系统。对不同复杂程度的源图像进行的压缩实验表明,该系统能够实现连续红外图像平均无损压缩比4.516,与JPEG2000标准算法相比,无损压缩比提高了59%以上。 相似文献
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Bayer图像的准无损压缩方法 总被引:5,自引:0,他引:5
介绍了准无损压缩的研究背景和3类准无损压缩方法.提出了针对Bayer格式图像的准无损压缩方法,该方法分为低通滤波预处理、JPEG-LS无损压缩、解压缩和重构4个步骤.实验表明,该方法在较高图像恢复质量情况下比标准JPEG-LS算法有更高的压缩比,而且可通过改变滤波行数实现一定范围内的PSNR可调. 相似文献
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This letter proposes a new near‐lossless image compression method with only one line buffer cost for a digital camera with Bayer format image. For such format data, it can provide a low average compression rate (4.24bits/pixel) with high‐image quality (larger than 46.37dB where the error of every pixel is less than two). The experimental results show that the near‐lossless compression method has better performance than JPEG‐LS (lossless) with δ = 2 for a Bayer format image. 相似文献
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基于干涉多光谱图像成像原理和特点,提出一种干涉多光谱图像无损压缩算法。在压缩编码时,应充分利用图像的列相关性,采用基于列的比特平面编码和游程编码,对多光谱图像进行无损压缩,特别适于低分辨率的多光谱图像压缩。目前无损压缩算法的压缩比基本在1.6~2.4之间,本算法的压缩倍数一般可达到2倍以上,并且具有良好的抗误码性能。 相似文献
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提出一种基于双阈值交替的遥感图像编码(DTAC)算法。根据整数小波变换(IWT)分解后不同阈值上的重要系数分布状况,对重要系数相对集中的区间用整数平方代替2的整数幂(IPT)作为量化阈值,在其他阈值区间中仍使用IPT,然后对每个阈值平面上的重要系数采用统一的编码策略。实验表明,新算法具有较低编码复杂度,不仅支持单一码流下从有损到无损的遥感图像编码,而且峰值信噪比(PSNR)高于采用IWT的SPECK编码算法。 相似文献
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We present a compound image compression algorithm for real-time applications of computer screen image transmission. It is called shape primitive extraction and coding (SPEC). Real-time image transmission requires that the compression algorithm should not only achieve high compression ratio, but also have low complexity and provide excellent visual quality. SPEC first segments a compound image into text/graphics pixels and pictorial pixels, and then compresses the text/graphics pixels with a new lossless coding algorithm and the pictorial pixels with the standard lossy JPEG, respectively. The segmentation first classifies image blocks into picture and text/graphics blocks by thresholding the number of colors of each block, then extracts shape primitives of text/graphics from picture blocks. Dynamic color palette that tracks recent text/graphics colors is used to separate small shape primitives of text/graphics from pictorial pixels. Shape primitives are also extracted from text/graphics blocks. All shape primitives from both block types are losslessly compressed by using a combined shape-based and palette-based coding algorithm. Then, the losslessly coded bitstream is fed into a LZW coder. Experimental results show that the SPEC has very low complexity and provides visually lossless quality while keeping competitive compression ratios. 相似文献
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The wireless sensor network utilizes image compression algorithms like JPEG, JPEG2000, and SPIHT for image transmission with high coding efficiency. During compression, discrete cosine transform (DCT)–based JPEG has blocking artifacts at low bit-rates. But this effect is reduced by discrete wavelet transform (DWT)–based JPEG2000 and SPIHT algorithm but it possess high computational complexity. This paper proposes an efficient lapped biorthogonal transform (LBT)–based low-complexity zerotree codec (LZC), an entropy coder for image coding algorithm to achieve high compression. The LBT-LZC algorithm yields high compression, better visual quality with low computational complexity. The performance of the proposed method is compared with other popular coding schemes based on LBT, DCT and wavelet transforms. The simulation results reveal that the proposed algorithm reduces the blocking artifacts and achieves high compression. Besides, it is analyzed for noise resilience. 相似文献
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基于小波的感兴趣区域无人机侦察图像的压缩 总被引:1,自引:0,他引:1
由于无人机飞行高度高、速度快,所以无人机侦察图像的目标和细节多、数据量大。为了实现图像数据的高速实时传输,需要对无人机侦察图像进行高压缩比压缩;但是在实际应用中,往往只对某些细节和目标感兴趣,要求这些区域清晰可见,这与图像的高压缩比压缩相矛盾,因此,本文提出了一种基于小波的无人机侦察图像压缩方法。该方法将感兴趣的军事目标从原图像中分离开来,对ROI(感兴趣区域)采用低压缩比甚至无损压缩,而对BG(背景区域)采用高压缩比压缩,最后合成两幅图像,解决了无人侦察机图像高压缩比和高质量之间的矛盾。 相似文献
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星载图像编码系统要求图像压缩算法具有一定压缩比、低复杂度的特点,同时希望尽可能减少码流比特错误造成的误码扩散。为了减少误码扩散,提出了一种易于硬件实现、低复杂度、抗误码强的树块数据无损压缩算法。图像数据经过小波变换后,将各级分辨率的系数按照树的结构进行排序,并由若干棵相邻的树构成树集合,称之为树块,每个树块独立进行比特平面编码,产生的码流独立进行打包。结果表明,这种编码方法有较低复杂度,易于硬件实现,能够有效优化,使输出码率达到最短,而且可以有效提高系统的抗误码性能。 相似文献