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Jul 28th, 2017
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  1. private Camera.PreviewCallback mPreviewCallback = new Camera.PreviewCallback(){
  2. public void onPreviewFrame(final byte[] imageData, final Camera camera) {
  3. if(!isThreadRunning) {
  4. lightIntensityHandler.post(new Runnable() {
  5. public void run() {
  6. processLightIntensity(imageData, camera);
  7. }
  8. });
  9. isThreadRunning = true;
  10. }
  11. }
  12. };
  13.  
  14. private void processLightIntensity(byte[] data, Camera camera) {
  15. try {
  16. int frameHeight = camera.getParameters().getPreviewSize().height;
  17. int frameWidth = camera.getParameters().getPreviewSize().width;
  18. // number of pixels
  19. int n[] = new int[frameWidth * frameHeight];
  20. //transforms NV21 pixel data into RGB pixels
  21. int[] myPixels = decodeYUV420SP(n, data, frameWidth, frameHeight);
  22.  
  23. int centreIndex = Math.round(myPixels.length / 2);
  24. int[] centrePixelGroup = Arrays.copyOfRange(myPixels, centreIndex - 200,
  25. centreIndex + 200);
  26.  
  27.  
  28. int sum = 0;
  29. for (int i = 0; i < centrePixelGroup.length; i++) {
  30. sum = sum + getLightnessValue(centrePixelGroup[i]);
  31. }
  32.  
  33. final int lightness = Math.round(sum / centrePixelGroup.length);
  34.  
  35. synchronized(this){
  36. isThreadRunning = false;
  37. }
  38.  
  39. mImageListener.onImageCapturing(lightness);
  40.  
  41. }catch (Exception e){
  42. e.printStackTrace();
  43. }
  44. }
  45.  
  46. private int getLightnessValue(int pixel) {
  47. float[] pixelHSV = new float[3];
  48. int blue = Color.blue(pixel);
  49. int red = Color.red(pixel);
  50. int green = Color.green(pixel);
  51.  
  52. ColorUtils.RGBToHSL(red, green, blue, pixelHSV);
  53. int heuValue = (int) pixelHSV[0];
  54. float lightness = pixelHSV[2];
  55. float saturation = pixelHSV[1];
  56. int lightnessValue = (int)(lightness * 100);
  57.  
  58. return lightnessValue;
  59. }
  60. /*Coverts NV21 pixel data to Pixel Array*/
  61. public int[] decodeYUV420SP(int[] rgb, byte[] yuv420sp, int width, int height) {
  62.  
  63. final int frameSize = width * height;
  64.  
  65. for (int j = 0, yp = 0; j < height; j++) { int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
  66. for (int i = 0; i < width; i++, yp++) {
  67. int y = (0xff & ((int) yuv420sp[yp])) - 16;
  68. if (y < 0)
  69. y = 0;
  70. if ((i & 1) == 0) {
  71. v = (0xff & yuv420sp[uvp++]) - 128;
  72. u = (0xff & yuv420sp[uvp++]) - 128;
  73. }
  74.  
  75. int y1192 = 1192 * y;
  76. int r = (y1192 + 1634 * v);
  77. int g = (y1192 - 833 * v - 400 * u);
  78. int b = (y1192 + 2066 * u);
  79.  
  80. if (r < 0)
  81. r = 0;
  82. else if (r > 262143)
  83. r = 262143;
  84.  
  85. if (g < 0)
  86. g = 0;
  87. else if (g > 262143)
  88. g = 262143;
  89.  
  90. if (b < 0)
  91. b = 0;
  92. else if (b > 262143)
  93. b = 262143;
  94.  
  95. rgb[yp] = 0xff000000 | ((r << 6) & 0xff0000) | ((g >> 2) & 0xff00) | ((b >> 10) & 0xff);
  96. }
  97. }
  98. return rgb;
  99. }
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