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Separate out regions of an image corresponding to objects which we want to analyze. This separation is based on the variation of intensity between the object pixels and the background pixels. To differentiate the pixels we are interested in from the rest which will eventually be rejected , we perform a comparison of each pixel intensity value with respect to a threshold determined according to the problem to solve. Once we have separated properly the important pixels, we can set them with a determined value to identify them i.
OpenCV offers the function threshold to perform thresholding operations. We can effectuate 5 types of Thresholding operations with this function. We will explain them in the following subsections. The plot below depicts this. The horizontal blue line represents the threshold thresh fixed. So, if the intensity of the pixel src x,y is higher than thresh , then the new pixel intensity is set to a MaxVal.
Otherwise, the pixels are set to 0. If the intensity of the pixel src x,y is higher than thresh , then the new pixel intensity is set to a 0. Otherwise, it is set to MaxVal. The maximum intensity value for the pixels is thresh , if src x,y is greater, then its value is truncated. If src x,y is lower than thresh , the new pixel value will be set to 0.
If src x,y is greater than thresh , the new pixel value will be set to 0. You can also download it from here. If it is RGB we convert it to Grayscale. For this, remember that we can use the function cvtColor:. Wait until the user enters the threshold value, the type of thresholding or until the program exits. As you can see, the function threshold is invoked.
We give 5 parameters:. After compiling this program, run it giving a path to an image as argument. For instance, for an input image as:. First, we try to threshold our image with a binary threhold inverted. Now we try with the threshold to zero.
With this, we expect that the darkest pixels below the threshold will become completely black, whereas the pixels with value greater than the threshold will keep its original value. This is verified by the following snapshot of the output image:. Making your own linear filters! Navigation index next previous OpenCV 2. Perform basic thresholding operations using OpenCV function threshold.
Threshold to Zero 4: For this, remember that we can use the function cvtColor: For instance, for an input image as: This is verified by the following snapshot of the output image: Help and Feedback You did not find what you were looking for?
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