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########################## character types in Python ########################### There are two types of characters in Python:# 1. STR type: A character in an ASCII table, which occupies one byte, so is also called a byte character. The literal is expressed in double quotation marks.# 2. Unicode type: The number of bytes consumed by a string is related to the encoding format used when saving. The literal is represented by double quotation marks with a "u" prefix.S=' OK, 'U=U ' Me, 'U1=U ' Me '

faces are created. Before drawing the six faces, you must first calculate the coordinates of each point based on the rotation angle. See the following figure. Based on the preceding figure, use the following formula to obtain the converted fixed point coordinates. Rect.prototype.getPoint = function(p){ var u2,v2,w2,u=p[0],v=p[1],w=p[2]; u2 = u * Math.cos(this.angleX) - v * Math.sin(this.angleX);

, the information of the three components of each pixel is complete (each component is usually 8 bits). After 8 bits quantization, each uncompressed pixel occupies 3 bytes. The following four pixels are: [Y0 U0 V0] [Y1 U1 V1] [Y2 U2 V2] [Y3 U3 V3] The stored code stream is Y0 U0 V0 Y1 U1 V1 Y2 U2 V2 Y3 U3 V3 (2) YUV The sampling rate of each chromatic aberration channel is half of the brightness channel, so

the three channels of YUV is the same. Therefore, in the generated image, the information of the three components of each pixel is complete (each component is usually 8 bits). After 8 bits quantization, each uncompressed pixel occupies 3 bytes. The following four pixels are: [y0 U0 V0] [Y1 U1 V1] [Y2 U2 V2] [Y3 U3 V3] The stored code stream is y0 U0 V0 Y1 U1 V1 Y2 U2 V2 Y3 U3 v3 (2) YUV The sampling r

1 Overview YUV is a color encoding method. It is developed to be compatible with black and white TVs. In Modern Color TV systems, three-channel color cameras or color CCD cameras are usually used to retrieve images, and then the acquired color image signals are divided by color, respectively amplified and corrected to obtain RGB, then, the Brightness Signal y and two color difference signal R-Y (U) and B-Y (v) are obtained through Matrix Transform circuit, and the three signals are encoded respe

The unsigned number belongs to the basic data type. u1, u2, u4, and u8 represent the unsigned number of 1, 2, 4, and 8 bytes respectively. A table is a data type that consists of multiple unsigned numbers or other tables as data items. All Tables habitually end with "_ info. (), Its only function is to determine whether the file is a Class file that can be accepted by the virtual machine. Its value is fixed to 0 xCAFEBABE. The four bytes of magic

components of each pixel is complete (each component is usually 8 bits). After 8 bits quantization, each uncompressed pixel occupies 3 bytes. The following four pixels are: [y0 U0 V0] [Y1 U1 V1] [Y2 U2 V2] [Y3 U3 V3] The stored code stream is y0 U0 V0 Y1 U1 V1 Y2 U2 V2 Y3 U3 v3 (2) YUV The sampling rate of each chromatic aberration channel is half of the brightness channel, so the color sampling rate in th

U2 V2] [Y3 U3 V3], where the stored code streams are: y0 U0 V0 Y1 U1 V1 Y2 U2 V2 Y3 U3 v3 (2) YUV The sampling rate of each chromatic aberration channel is half of the brightness channel, so the color sampling rate in the horizontal direction is only half. For non-compressed 8-bit quantization images, each macro pixel consisting of two adjacent horizontal pixels occupies 4 bytes of memory. The following f

OrderId field of the database is set to null when OrderItem is saved, then Update the Order Id to OrderItem. [Note: this is the final result, not the intermediate result. During the Insert OrderItem operation, its OrderId is the Id of the Order object corresponding to the object. If the Order object is not saved, then, OrderId is null. If it is saved, it is the Id of the Order, and then the OrderId will be updated.] Next, let's take a specific example: department and employee, one-to-multiple

In the previous article, we used the description of the SIP Routing Mechanism to understand the definition and concept of the SIP routing mechanism. Next, let's explain these abstract concepts to help you understand them. Next, we will use two SIP routing instances to help you understand these concepts. SIP route Example 1: Scenario: There are two proxies between two UE, U1-> P1-> P2-> U2, and both proxies are willing to add Record-Route header fields

used, the meaning is: each point to save a 8bit brightness value (that is, Y value), each 2x2 point to save a Cr and CB value, the image in the naked eye does not feel much change. Therefore, the original use of RGB (R,g,b are 8bit unsigned) model, 4 points need to 8x3=24 bites (such as the first figure). Now only 8+ (8/4) + (8/4) =12bites is required, averaging 12bites per point, which compresses half the image's data.The above only gives a theoretical example, in the actual data storage is li

specified later is called before the function exits. Func ReadWrite () bool { file. Open ("file") defer file. Close () if Failurex { return false } if Failurey { return false } return True} If there are many calls, then the last-in- defer defer first-out mode is used, so the following code will output4 3 2 1 0 For I: = 0; I The first impression that defer gave me was that, like in Java, try { }finally { } My current understanding is that in the function bloc

value), each 2x2 point to save a Cr and CB value, the image in the naked eye does not feel much change. Therefore, the original use of RGB (R,g,b are 8bit unsigned) model, 4 points need to 8x3=24 bites (such as the first figure). Now only 8+ (8/4) + (8/4) =12bites is required, averaging 12bites per point, which compresses half the image's data.The above only gives a theoretical example, in the actual data storage is likely to be different, the following gives several specific storage forms:(1)

class file Structure The class file is a 8-bit byte stream. All 16, 32, and 64 bits of data are stored in Big-endian form with a continuous number of 8 bits. Data type in class file U1, U2, U4 represent unsigned 1, 2, 4 byte data. The 0......* type data will be represented as table. Classfile structure U4 Magic; U2 minor_version;

The main sampling formats are YCbCr, and YCbCr. YCbCr is commonly used. It means that each vertex stores an 8-bit brightness value (that is, the Y value), and each 2x2 points stores a Cr and CB value, the image does not feel much changed to the naked eye. Therefore, the original RGB (R, G, and B are all 8bit unsigned) models, 4 points require 8x3 = 24 bites (such as the first figure ). now, we only need 8 + (8/4) + (8/4) = 12 bites, and each point occupies 12 bites on average (such as the second