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How to align a mask onto an image


How to align a mask onto an image

By : pok
Date : November 22 2020, 10:40 AM
I wish this helpful for you The problem here is that if you use aspect fit then the size of the image as displayed depends upon both the size of the original image and the size of the image view. What you are trying to do is to imitate what the image view does to the image - and you have no way of knowing exactly what that is.
The best you can do is guess. What you are looking for is the size of the largest rectangle that will fit into your image view's bounds while keeping the aspect ratio of the original image. It happens that if you import the AV Foundation framework, there's a handy function that gives you that information, AVMakeRectWithAspectRatioInsideRect (documented here: https://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVFoundation_Functions/index.html#//apple_ref/c/func/AVMakeRectWithAspectRatioInsideRect).
code :


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Why does my image mask make my image black, where the mask is white?

Why does my image mask make my image black, where the mask is white?


By : Samer Hannoun
Date : March 29 2020, 07:55 AM
will be helpful for those in need I guess your code is from here. There is this comment:
Bootstrap 2 columns vertical align + 1 image align left + 1 image align right

Bootstrap 2 columns vertical align + 1 image align left + 1 image align right


By : bizzl
Date : March 29 2020, 07:55 AM
seems to work fine It's because you didn't float left or right the good element.
Here is the working code with better class ( pull-right and pull-left )
code :
 <div class="container" >
        <div class="col-md-6">
            <div style="display:table; height:100px;" class="pull-left">
                <div style="display:table-cell; vertical-align:middle; ">
                    <div> 
                        <img src="http://tarheelreader.org/theme/images/reviewed.png" /> 
                    </div>
                </div>
            </div>              
        </div>
        <div class="col-md-6">
            <div style="display:table; height:100px;" class="pull-right">
                <div style="display:table-cell; vertical-align:middle;">
                    <div>
                        <img src="http://tarheelreader.org/theme/images/reviewed.png" /> 
                    </div>
                </div>
            </div>              
        </div>
    </div>
Create mask from color Image in C++ (Superimposing a colored image mask)

Create mask from color Image in C++ (Superimposing a colored image mask)


By : user2463383
Date : March 29 2020, 07:55 AM
it helps some times I've wrote a code which detects squares (white) in realtime and draws a frame around it. Each side of length l of the squares is divided in 7 parts. Then I draw a line of length h=l/7 at each of the six points evolving from the deviation perpendicular to the side of the triangle (blue). The corners are marked in red. It then looks something like this: , 1. Custom version
I would write it explicitly:
code :
const int cols = drawing.cols;
const int rows = drawing.rows;

for (int j = 0; j < rows; j++) {
    const uint8_t* p_draw = drawing.ptr(j); //Take a pointer to j-th row of the image to be drawn
    uint8_t* p_dest = webcam_img.ptr(j);  //Take a pointer to j-th row of the destination image
    for (int i = 0; i < cols; i++) {
        //Check all three channels BGR
        if(p_draw[0] | p_draw[1] | p_draw[2]) { //Using binary OR should ease the optimization work for the compiler
            p_dest[0] = p_draw[0]; //If the pixel is not zero, 
            p_dest[1] = p_draw[1]; //copy it (overwrite) in the destination image
            p_dest[2] = p_draw[2];
        }
        p_dest += 3; //Move to the next pixel
        p_draw += 3; 
    }
}
cv::Mat mask;
//Create a single channel image where each pixel != 0 if it is colored in your "drawing" image
cv::cvtColor(drawing, mask, CV_BGR2GRAY);
 //Copy to destination image only pixels that are != 0 in the mask
drawing.copyTo(webcam_img, mask);
Different CSS mask-position values per mask-image in a composite mask

Different CSS mask-position values per mask-image in a composite mask


By : Pop
Date : March 29 2020, 07:55 AM
help you fix your problem This is possible, per the current spec, which is in initial definition (and is experimental, so it may change). From https://developer.mozilla.org/en-US/docs/Web/CSS/mask-position:
code :
mask-position: 0 0, 15px -50px;
numpy: combine image mask with RGB to get colored image mask

numpy: combine image mask with RGB to get colored image mask


By : user3297054
Date : March 29 2020, 07:55 AM
may help you . how can I combine a binary mask image array (this_mask - shape:4,4) with a predefined color array (mask_color, shape:3) , The following function should do what you want.
code :

def apply_mask_color(mask, mask_color):
    return np.concatenate(([mask[ ... , np.newaxis] * color for color in mask_color]), axis=2)


this_mask = np.array([
    [0,1,0,0],
    [0,0,0,0],
    [0,0,0,0],
    [0,0,0,0],
    ])

mask_color = np.array([128, 128, 64])

applied = apply_mask_color(this_mask, mask_color)
print(applied.shape) #(4, 4, 3)


print(applied)


[[[  0   0   0]
  [128 128  64]
  [  0   0   0]
  [  0   0   0]]

 [[  0   0   0]
  [  0   0   0]
  [  0   0   0]
  [  0   0   0]]

 [[  0   0   0]
  [  0   0   0]
  [  0   0   0]
  [  0   0   0]]

 [[  0   0   0]
  [  0   0   0]
  [  0   0   0]
  [  0   0   0]]]

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