Android app for resolving vertical line camera issue on Xiaomi Mi A3.
The goal of the app is to eliminate hot pixels produced by a faulty Xiaomi Mi A3 selfie camera sensor. The app should be able to read a camera image stored in the device, process the image and then save/replace the input file with the generated file.
Inside the core of the app a simple image processing algorithm is developed in order to replace the corrupted pixels. We know as a rule that such pixels are only present in the form of vertical lines or strips in the generated selfie image file. Thus, the algorithm includes the following sequence of operations :
- For each row:
- Read the color values of the strip's left and right pixels
- For each intermediate pixel use linear interpolation to determine its value
- Add a random factor in each pixel inside the strip
- Keep pixel values in the appropriate range (0-255)
For the implementation of the algorithm described above, the following Java method is used:
/**
Eliminate vertical strip of hot pixels in an image.
@param x1 horizontal coordinate of the first pixel (left) of the vertical strip range
@param x2 horizontal coordinate of the last pixel (right) of the vertical strip range
@param rand random permutation to be applied in every pixel of the strip
@param neigh number of strip's neighbor pixels that will be taken into account
@return void
*/
void setStrip(int x1, int x2, int rand, int neigh);An example of the application's results is presented below :
| Input image | Output image |
|---|---|
 |
 |