pixel

Pixel access in OpenCV 2.2

由 元气小坏坏 提交于 2019-11-26 08:32:24
问题 Hi I want to use opencv to tell me the pixel values of a blank and white image so the output would look like this 10001 00040 11110 00100 Here is my current code but I\'m not sure how to access the results of the CV_GET_CURRENT call.. any help ? IplImage readpix(IplImage* m_image) { cout << \"Image width : \" << m_image->width << \"\\n\"; cout << \"Image height : \" << m_image->height << \"\\n\"; cout << \"-----------------------------------------\\n\"; CvPixelPosition8u position; CV_INIT

How to get the pixel color on touch?

由 烈酒焚心 提交于 2019-11-26 07:24:36
问题 I know this is a common question and there are a lot of answers of this question. I\'ve used some of this. Although many of them are the same. But the sad thing for me is that none of them worked for me. The following codes i\'ve used till now. -(void)getRGBAsFromImage:(UIImage*)image atX:(int)xx andY:(int)yy { // First get the image into your data buffer CGImageRef imageRef = [image CGImage]; NSUInteger width = CGImageGetWidth(imageRef); NSUInteger height = CGImageGetHeight(imageRef);

How to read the Color of a Screen Pixel

由 孤人 提交于 2019-11-26 07:18:35
Okay, I am looking for a function or something that will read the color of a certain pixel on my monitor, and when that color is detected, another function will be enabled. I figure using RGB. All help appreciated. Thank You. This is the most efficient: It grabs a pixel at the location of the cursor, and doesn't rely on only having one monitor. using System; using System.Drawing; using System.Drawing.Imaging; using System.Runtime.InteropServices; using System.Windows.Forms; using System.Diagnostics; namespace FormTest { public partial class Form1 : Form { [DllImport("user32.dll")] static

How to read the RGB value of a given pixel in Python?

由 折月煮酒 提交于 2019-11-26 06:33:47
If I open an image with open("image.jpg") , how can I get the RGB values of a pixel assuming I have the coordinates of the pixel? Then, how can I do the reverse of this? Starting with a blank graphic, 'write' a pixel with a certain RGB value? I would prefer if I didn't have to download any additional libraries. Dave Webb It's probably best to use the Python Image Library to do this which I'm afraid is a separate download. The easiest way to do what you want is via the load() method on the Image object which returns a pixel access object which you can manipulate like an array: from PIL import

How to change a particular color in an image?

由 我是研究僧i 提交于 2019-11-26 06:16:27
问题 My question is if I have a Lion image just I want to change the color of the lion alone not the background color. For that I referred this SO question but it turns the color of whole image. Moreover the image is not looking great. I need the color change like photoshop. whether it is possible to do this in coregraphics or I have to use any other library. EDIT : I need the color change to be like iQuikColor app 回答1: See answers below instead. Mine doesn't provide a complete solution. Here is

How to get the color of a pixel in an UIView?

由 情到浓时终转凉″ 提交于 2019-11-26 04:39:49
问题 I am trying to develop a small application. In it, I need to detect the color of a pixel within an UIView. I have a CGPoint defining the pixel I need. The colors of the UIView are changed using CoreAnimation. I know there are some complex ways to extract color information from UIImages. However I couldn\'t find a solution for UIViews. In Pseudo-Code I am looking for something like pixel = [view getPixelAtPoint:myPoint]; UIColor *mycolor = [pixel getColor]; Any input greatly appreciated. 回答1:

How to convert DP, PX, SP among each other, especially DP and SP?

由 最后都变了- 提交于 2019-11-26 04:19:31
问题 I have known the difference among DP , SP and PX . And after searching this topic, I found nothing satisfying me completely. Maybe this post is a duplicate, but I still want to know what is the formula of converting from DP to PX , and DP to SP , from SP to PX , from PX to SP , from SP to DP , from DP to SP ? I have known some codes to do this, but they are imperfect. 回答1: DP to PX: public static int dpToPx(float dp, Context context) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX

How to read the Color of a Screen Pixel

由 江枫思渺然 提交于 2019-11-26 03:26:34
问题 Okay, I am looking for a function or something that will read the color of a certain pixel on my monitor, and when that color is detected, another function will be enabled. I figure using RGB. All help appreciated. Thank You. 回答1: This is the most efficient: It grabs a pixel at the location of the cursor, and doesn't rely on only having one monitor. using System; using System.Drawing; using System.Drawing.Imaging; using System.Runtime.InteropServices; using System.Windows.Forms; using System

Android background image size in pixel

由 本小妞迷上赌 提交于 2019-11-26 02:19:18
问题 I would like to create a background image for different resolutions in Android. So I need the values (in pixel) for ldpi, mdpi, hdpi,xhdpi and xxhdpi. It is important that the image will not be blurred. I have already read the Documentation about multiple screen support but there are sizes in dp instead of pixel. 回答1: there is no full list of screen resolutions, there are no fixed values in pixels for ldpi, mdpi, hdpi,xhdpi and xxhdpi. Every android device may have different resolution. If

Get Pixel color of UIImage

由 匆匆过客 提交于 2019-11-26 02:06:24
问题 How can I get the RGB value of a particular pixel in a UIImage? 回答1: You can't access the raw data directly, but by getting the CGImage of this image you can access it. here is a link to another question that answers your question and others you might have regarding detailed image manipulation : CGImage 回答2: Try this very simple code: I used to detect a wall in my maze game (the only info that I need is the alpha channel, but I included the code to get the other colors for you): - (BOOL
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