位运算

指出某种操作并标识其操作数（如果有操作数的话）的一种语言构造。按位运算来源于c语言的低级操作。

A language construct that specifies an operation and identifies its operands , if any . The bitwise operators come from C 's low-level orientation ;

现在，我们需要提供逐位运算函数：&（and）、（or）、^（exclusiveor）、or~（not）。

Now we need to provide bitwise operation functions : & ( and ), | ( or ), ^ ( exclusive or ), or ~ ( not ) .

C语言位运算功能的妙用

The Application Tips of C Language in Bit Operation

C程序设计的位运算教学方法

Teaching Methords of C Program about Bit Operation

此外，对采用基于位运算方法加密BMP图像的抗噪声性能也进行了分析。

Finally , antinoise performance of encrypted image based on block cipher is analyzed .

我们定义了一类整数线性一阶逻辑判定公式，此类判定公式支持C程序中常用的整数线性运算。我们优化了判定过程，并扩充了对整数除法、取余和位运算的支持。

We define an extended class of integer linear first-order logic formula , which supports most integer linear and bit-wise expressions in C programs including integer division , integer modular and bit-wise operation .

本文还提供了一组在整型变量之间执行逐位运算的UDF。

This article also offers a set of UDFs that perform bitwise operations between integer arguments .

正如简介中提到的，PL/SQL和T-SQL支持声明为integer的变量之间的逐位运算。

As I mentioned in the introduction , PL / SQL and T-SQL supports bitwise operations between arguments declared as integer .

算法通过位运算快速计算像素的覆盖面积，并且像素亮度等级可达到2n（n为亚像素位数，通常情况n取8）。

Algorithm use bit operation to vastly calculate pixel cover area , and the brightness levels is up to 2 ~ n ( n for the sub-pixel digits , usually n get 8 ) .

下一个也是最后一个涉及逐位运算的UDF是逐位NOT运算，在转换成二进制表达式时，该UDF对给定的整数值执行逐位逻辑NOT运算。

The next and last UDF to cover bitwise operations is bitwise NOT that performs a bitwise logical NOT operation for one given integer value as translated to a binary expression .

逐位运算在其二进制形式的整型变量上执行逻辑AND、OR、EXLUSIVEOR和NOT运算。

Bitwise operations perform logical AND , OR , EXLUSIVE OR , and NOT operations on binary representations of their integer arguments .

基于位运算的两种字符串加密解密算法

Two Encryption and Decryption Algorithms of String based on Bit Operation

只能对整型执行按位运算。

Bitwise operations can be performed on integral types only .

基于对角折叠位运算的图像置乱方法

An image scrambling method based on bit operation of diagonally folded pixels

位运算标记对象的当前状态

Flagging current status of object with bit - operation

一种基于位运算的数字图像加密算法

An Image Encryption Algorithm Based on Bit-Computation

流密码与分组密码是基于位运算的图像加密算法中两种主要密码体制。

Stream cipher and block cipher are main cipher systems in image encryption algorithm based on bit operation .

位运算具有占用资源少、高效运算的特性，对数据的处理效率带来很大的提升，将位运算应用于运动估计中也是非常有必要的。

Bitwise operation needs less resource and is very efficient in operation . It improves the processing efficiency .

为了能够实现对数字图像内容信息的有效保护，文章结合基于混沌系统的数字图像加密算法，给出了一种基于位运算的数字图像隐藏技术。

In order to protect the information in image , we present an image hiding method based on bit-operation and chaotic system .

其中位图索引因为其结构简单，并且硬件支持二进制位运算效率很高，被广泛应用在数据仓库中。

Bitmap index is widely used in the data warehouse because of its simple structure and its high efficiency of logic operation .

然后本文分别研究了在采用二维表的形式和链式结构来存储信息粒下，利用二进制粒位运算提取频繁项目集来发现关联规则。

Then we researched the methods of mining frequent items to get association rules using binary granules with two-dimension table and link structure .

通过简单的转换将原始数据流序列转换为布尔序列，利用布尔序列间的位运算快速获取结果。

As original sequences are transformed into Boolean series , we can get the correlation results effectively by bit operations among Boolean series .

基于权重的订阅多层索引结构有效的减少了相同三元组的重复匹配，基于位运算的语义匹配大大提高了匹配的效率。

Weight-based multi-index structure of subscriptions reduces the matching of the same triple , bitwise based semantic matching algorithm greatly improves the matching efficiency .

协议在完成身份认证的基础上，会话密钥组的计算与参数的正确性确认均采用简单的位运算，并且通过参保密钥的动态切换可以抵抗非同步攻击。

The calculation of session key groups and the verifying of parameters ' correctness are done by simple bit operation on the basis of completing identity authentication , and the asynchronous attack can be resisted by dynamically switching the parameter of the protection keys .

通过引入搜索状态向量及字符－模式匹配向量，该技术将字符串匹配比较转化为简单的整数字位运算，通过对字符串方向相反的搜索有效地实现了多处理机对字符串的并行相似检索。

By using searching state vector and char-pattern matching vector , this approach transforms comparisons for string matching into simple integer bit operations and , by searching string from the two ends to the middle , it implements efficiently the parallel approximate string searching on multiprocessors .

利用FPGA的寄存器和BlockRAM资源，设计出高效的按位转置运算逻辑。

Effective transposition logic is designed by using registers and Block RAM resources within FPGA .

为了提高整个设计模块的控制精度，采用16位定点运算的方法进行PID控制器的设计。

In order to improve the precision of the control modules , use16 fixed-point of computing the PID controller of the design , and optimize the design .

系统前端加了CMOS图像采集芯片OV7120，实现了32位浮点运算和8位数据的采集。

A CMOS image sensor ( OV7120 ) has been added to the system to implement image collecting .

一致性计算过程可通过按位比特运算在线完成。

The consistency computation could be completed online through bit-wise operations .

分析了像素的高位与低位的相关性，提出了对字位进行运算的无损压缩算法。

The correlation of the pixel bits is analyzed .