Scale Mat Image
The color channels of the image are misaligned because of the mechanical nature of the camera.
Scale mat image. The code below illustrates these operations on both data types. An image cannot be resized or rescaled inplace in opencv. In the following example we will scale the image only along y axis or vertical axis. Providing a value 100 downscales the image provided.
Cv2 resize along width or horizontal axis cv2 resize image vertically. Dsize a size object representing the size of the output image. In the following example scale percent value holds the percentage by which image has to be scaled. Since in opencv images are represented by the same structure as matrices we use the same convention for both cases the 0 based row index or y.
Width of the output image remains unchanged from that of the source image. Note that the matrix has data type double with values outside of the range 0 1 including negative values. B imresize a scale returns image b that is scale times the size of a the input image a can be a grayscale rgb or binary image. Dst a mat object representing the destination output image for this operation.
If a has more than two dimensions imresize only resizes the first two dimensions. Setting and getting pixel values of a gray image in c. The image was taken by a russian photographer in the early 1900s using one of the early color cameras. The image on the left is part of a historic collection of photographs called the prokudin gorskii collection.
The image on the right. Note the ordering of x and y. Fx a variable of the type double representing the scale factor along the horizontal axis. Src a mat object representing the source input image for this operation.
Display the result of the operation. In the dsize we will keep the width same as that of original image but change the height. We will use this scale percent value along with original image s dimensions to calculate the width and height of output image. Here is an example for a single channel grey scale image type 8uc1 and pixel coordinates x and y.
If scale is in the range 0 1 b is smaller than a. You will need to create another image with the new size or scale and apply a resize operation.