多媒体技术chapter 3 Graphics and Image Data Representations.pptVIP

下载本文档

1
0
约9.1千字
约 50页
2016-08-23 发布于河南
举报
版权申诉

多媒体技术chapter 3 Graphics and Image Data Representations.ppt

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

多媒体技术chapter 3 Graphics and Image Data Representations

2017-3-28 1 Chapter 3Graphics and Image Data Representations 3.1 Graphics/Image Data Types 3.2 Popular File Formats 2017-3-28 2 3.1 Graphics/Image Data Types 3.1.1 1-bit Images 3.1.2 8-bit Gray-level Images 3.1.3 Image Data Types 3.1.4 24-bit Color Images 3.1.5 8-bit Color Images 3.1.6 Color Look-up Tables (LUTs) 2017-3-28 3 3.1 Graphics/Image Data Types 2017-3-28 4 3.1.1 1-bit Images Each pixel is stored as a single bit (0 or 1), so also referred to as binary image. Such an image is also called a 1-bit monochrome image since it contains no color. Fig. 3.1 shows a 1-bit monochrome image (called “Lena” by multimedia scientists—— this is a standard image used to illustrate many algorithms). 2017-3-28 5 2017-3-28 6 3.1.2 8-bit Gray-level Images Each pixel has a gray-value between 0 and 255. Each pixel is represented by a single byte; e.g., a dark pixel might have a value of 10, and a bright one might be 230. Bitmap: The two-dimensional array of pixel values that represents the graphics/image data. 2017-3-28 7 8-bit Gray-level Images Fairly high resolution for such an image might be 1600×1200, whereas lower resolution might be 640×480. 8-bit image can be thought of as a set of 1-bit bit-planes,where each plane consists of a 1-bit representation of the image at higher and higher levels of “elevation”: a bit is turned on if the image pixel has a nonzero value that is at or above that bit level. 2017-3-28 8 2017-3-28 9 8-bit Gray-level Images Each pixel is usually stored as a byte (a value between 0 to 255), so a 640×480 grayscale image requires 300 kB of storage (640× 480 = 307,200). 2017-3-28 10 Multimedia Presentation 2017-3-28 11 Dithering Dithering is used to calculate patterns of dots such that values from 0 to 255 correspond to patterns that are more and more filled at darker pixel values, for printing on a 1-bit printer. The main strategy is to replace a pixel value by a larger pattern, say 2*2 or 4*4, such that the number of printed dots approximates the v