digital | 易学教程

Digital PDF Document Signing

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问题 Update 2: I have uploaded sample at https://1drv.ms/u/s!Al69FgQ8jwmZbgiBMXLLM4j5sbU?e=vyGF4m Can you please check. I am stuck at last step. However, please confirm if other appraoch is correct. Update 1: I have confirmed the flow. So I am clear on it. As part of that digital signing PDF document flow , We want to use third party to provide Signed Hash of PDF. Here are steps: There is 3rd party inhouse system which will generate PDF document from word. That PDF will be send to another service

Adding text to image and save

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问题 In my program i allow the user to enter some text which then gets put on top of an image using the graphics.DrawString() method. When i then go to save this image, it saves it without the text. How can i save both as one image? I have seen a few examples but none of which have helped. private void txtToolStripMenuItem_Click(object sender, System.EventArgs e) { Rectangle r = new Rectangle(535, 50, original_image.Width, original_image.Height); Image img = Image.FromFile("C:\\PCB.bmp"); Bitmap

Digital Image Processing(DIP)笔记(第一章)

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1.2图像存储格式分辨率空间分辨率: 物理1meter占几个像素灰度级分辨率:一个像素占的二进制位数灰度图像 RGB三种像素值相等, 构成颜色表(索引表,列为0-255,行为RGB大小) 像素值就是索引号, 有2^8个 0黑色 255白色彩色图真彩24位, 2^24种颜色, 没有索引表每个分量占8位,RGB共24位有3个矩阵, 每个矩阵的元素仍是8位伪彩色8位, 256色, 有索引表, 在灰度图基础上让RGB三个分量不等即可, 只有一个矩阵即颜色表 RGB分量像素值不等伪彩色中: R255红, G255绿B255蓝位图常见格式 BMP, bitMap格式位图格式 GIF<Graphics InterchaFormat> 交流传输, 不作为文件存储格式 max 64M, 256色 TIFF<Tagged Image FormatFile> 复杂文件,丰富的扩展性可修改性不通用不常见很少用 JPEG<Joint Photographic Expert Group> 总结 :按照颜色深度分类黑白图像 8位索引图象 8位灰度图像 8位伪彩色图像 24位真彩图像 1.5 BMP 文件存储格式 BMP文件组成文件头 BITMAP FILE HEADER 信息头 BITMAP INFO HEADER 颜色表 RGB QUAD 像素数据 DATA /***

self completing code

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问题 https://electronics.stackexchange.com/questions/20537/how-to-identify-self-complementing-code I have read that properly , but is it necessary that , the number need to be subtracted from 9 ? because in the 8421 system 12= 1100 and if we subtract 15-12 , then the answer is 3 , which is 0011 . so it is also self complementing... I don't understand that , the given number need to be subtracted from which number , is that number neccessary to be 9 ??? 回答1: If the sum of the weights is 9 then it

iPhone Digital Clock

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问题 After the long time I spent getting an analog clock to work, I am trying to make a digital one ( sigh ). I am trying to do this with 10 PNGs with the numbers 0 - 9. Each digit of the clock would be an image. The only problem with this is retrieving the certain digit from the current time. I've tried converting the time to a string and using the characterAtIndex, but that doesn't seem to work. What would be the best way to get around this? 回答1: You could use NSDateComponents and NSCalendar :

Digital microphone : I2S data output [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed last year . I have been playing around with some digital microphones, which have an I2S interface. I managed to get it working (Arduino board with small I2S mems board). At least, I think I did. When reading the I2S specification, or the microphone datasheet, I can not seem to find the answer to the following simple questions

How do the digits 1101004800 correspond with the number 20?

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问题 I'm trying to learn how to modify memory locations using C++ and when messing with MineSweeper, I noticed that when the clock's value in memory was 1101004800, it was 20 seconds into the game. The digits 1101529088 correspond with 21 seconds into the game. Can someone please explain to me how to convert between those 10-digit long numbers to base-10? 回答1: They are using floats to represent the timer. Here is a program that converts your integers to floats: #include <stdio.h> int main() { int

Verilog error: Range must be bounded by constant expressions

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问题 I'm new to verilog and I am doing a project for my class. So here is my code: wire [n-1:0] subcounter_of_counter; reg [n-1:0] mask,free; //subcounter_of_counter: dinei ena vector apo poious subcounter apoteleitai o counter(id) always @(*) begin //command or id or mask or free or subcounter_of_counter if (command==increment) begin for (int i = 0; i < n; i=i+1)begin if (i<id) begin subcounter_of_counter[i]=1'b0; end else if (i==id) begin subcounter_of_counter[i]=1'b1; end else begin if( (|mask

Android - FM/Radio Transmitting

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问题 I was wondering if it is possible at all the manipulate the radio hardware on the device to transmit an FM signal on a specified frequency. As far as I am aware, the phone uses Bluetooth radio, it uses 802.11 radio, so would it not be possible to adjust the power output of the radio device to transmit at frequencies of 87.5–108.0 MHz? If anyone has any documentation/research papers/guides into this area, please let me know. Is there any generic radio support in the SDK? Because my thinking is

What is the purpose of the `std_logic` enumerated type in VHDL?

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问题 What is the purpose of the std_logic enumerated type? 'U': uninitialized. This signal hasn't been set yet. 'X': unknown. Impossible to determine this value/result. '0': logic 0 '1': logic 1 'Z': High Impedance 'W': Weak signal, can't tell if it should be 0 or 1. 'L': Weak signal that should probably go to 0 'H': Weak signal that should probably go to 1 '-': Don't care. 回答1: std_logic is basically a single wire or bit. You can use logical operators (and, or, xor, etc.) on them. When simulating