图像压缩

The tested and compared results show that the methods can be used in practice when the reflectance abridgement or spectral image compression is required.

可以看出，删节方法无论是对光谱反射比的删节还是对光谱图像的压缩，其结果都能很好的满足工业需求。

This paper puts forward a new image compression arithmetic, the Number Theoretic Transformation.

张虹提出了一种全新的图像数据压缩算法，即数论变换（Number Theory Transformation，NTT）算法。

The method includes steps: digital watermark technique is adopted to hide information of key data in not key data codes of compressed image; under protection of digital watermark, using protective backup for key data detects whether normal transmitted key data is correct or not so as to detect error code; carrying out cyclic mutual backup by using macro blocks in same positions in front and back macro block set; embedding coded motion vector in form of digital watermark to DCT transformation coefficient, and ensuring that video data are not influenced as best as one can; when error code occurs, if key data backup is correct, then the backup replaces former key data; otherwise, using mean value of key data in adjacent macro blocks within same frame to replace former key data approximately.

本发明中，采用数字水印技术在压缩图像的非关键数据编码中隐藏关键数据信息；通过数字水印保护下的关键数据保护备份来检测正常传输的关键数据是否正确，由此来检测传输误码；用前后宏块组中相同位置的宏块进行循环相互备份；对运动向量进行编码，然后以数字水印的形式嵌入到相对不重要的DCT变换系数中，同时保证视频数据尽量不受影响；在误码发生时，如果关键数据备份正确，则直接替代原关键数据，否则用同一帧内相邻宏块的关键数据的平均值近似替代原关键数据。

Acoustics; audiometric test methods; part 2: sound field audiometry with pure tone and narrow-band test signals

信息技术。连续色调静态图像的无损和近似无损压缩。第2部分：扩充

A fast and efficient automatic text location method is presented.

提出了一种基于DCT压缩域的字符定位算法，能够快速定位出具有复杂背景图像中的字符区域。

The trajectory of moving target can be recovered and a image mask can be formed from this difference image.

利用此掩模与距离压缩方位未聚焦的复图像相乘，以恢复动目标的幅度和相位。

Firstly,compression is done to face and iris image respectively,and the two corresponding original feature matrixes are obtained.

首先，对人脸图像与虹膜图像分别进行压缩降维处理，得到相应的初始特征矩阵。

The relativity between hyperspectral images of different waveband is differ from each other, contraposing this characteristic, this paper presents a lossless compression algorithm of hyperspectral image which is based on searching the optimal couple prediction wavebands.

摘要该文针对超光谱各波段成像图像之间的相关性强弱程度互不相同这一特点，提出了基于搜索最优双预测波段的超光谱图像无损压缩算法。

This system has detected more than 3000 pictures and the average detecting rate of various Steganographic methods is 90.085%, including jpeg pictures with low stega rate and cover pictures which are smoothened, sharpened, shirked, cuted or re-compressed.

系统对三千多幅JPEG图像进行盲检测测试，对于多种隐写方法取得平均检测率90.085%，包括低嵌入率的JPEG含秘图像和平滑、锐化、缩小、剪切和再压缩处理后的JPEG净图。

Sanyo Xacti VPC-HD1 features 720p HD video scanning (1280 x 760 progressive), 16:9 widescreen format (HD-SHQ / HD-HQ modes), 5.1 megapixel digital still photos, advanced MPEG-4 compression technology, ability to capture still and video images simultaneously, super-fast 9Mbs frame rate, 2.2 inch OLED (Organic Light-Emitting Diode) display, 10x optical zoom lens plus 10x digital zoom lens, ability to record over 41 minutes of High-Definition video on a 2 GB SD Card, built-in digital image stabilization, super fast start-up, wind noise reduction, built-in 4-mode flash, AAC-LC stereo recording, 22 adjustable manual focus settings, super macro shooting as low as 1cm, talking navigation guide for first-time users, PictBridge compatible and has USB 2.0 and S-Video output.

三洋HD1功能支持720p高清晰度视频扫描（ 1280 × 760渐进）， 16：9宽屏幕格式（的HD - SHQ /高清总部模式）， 510万像素数码照片，先进的MPEG - 4压缩技术，能够捕捉仍和视频图像的同时，超高速9Mbs帧速率， 2.2英寸的OLED显示屏， 10倍光学变焦镜头加上10倍数字变焦镜头，能够记录41分钟的高清晰度视频的2 GB的统计处卡，内置的数字图像稳定，超快速启动，风能减少噪音，内置的4模式闪光灯，支持AAC -立法会立体声录音， 22个可调手动对焦设置，超微距拍摄低1厘米，说话的导航指南第一次使用者，兼容PictBridge和USB 2.0和S - Video输出。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。