{
  "id": 591329,
  "title": "Flat Field Correction and jitter",
  "url": "/competitions/ariel-data-challenge-2025/discussion/591329",
  "author_name": "snehal",
  "post_date": "2025-07-27T06:46:26.997000",
  "votes": 1,
  "comment_count": 2,
  "views": 0,
  "content": "<p>Why does flat field correction not eliminate jitter noise? From what I’ve seen in the recommended readings it seems like the cause of jitter noise is non uniformity in the responsivity of each pixel. </p>",
  "messages": [
    {
      "id": 3258273,
      "postDate": "2025-07-30T13:28:28.937Z",
      "content": "<p>Flat field corrects for uneven illumination due to how the telescope is built  (like vignetting in daytime photography) and differences in pixel sensitivities.<br>\nJitter is due to the telescope \"vibrating\" so the star quickly shifts from place to place on the sensor. <br>\nSo these two are not related.</p>",
      "rawMarkdown": "Flat field corrects for uneven illumination due to how the telescope is built  (like vignetting in daytime photography) and differences in pixel sensitivities.\nJitter is due to the telescope \"vibrating\" so the star quickly shifts from place to place on the sensor. \nSo these two are not related.",
      "votes": 4
    },
    {
      "id": 3254754,
      "postDate": "2025-07-27T06:46:26.997Z",
      "content": "<p>Why does flat field correction not eliminate jitter noise? From what I’ve seen in the recommended readings it seems like the cause of jitter noise is non uniformity in the responsivity of each pixel. </p>",
      "rawMarkdown": "Why does flat field correction not eliminate jitter noise? From what I’ve seen in the recommended readings it seems like the cause of jitter noise is non uniformity in the responsivity of each pixel. ",
      "votes": 1
    },
    {
      "id": 3257030,
      "postDate": "2025-07-30T00:03:49.507Z",
      "content": "<p><a href=\"https://www.kaggle.com/gordonyip\" target=\"_blank\">@gordonyip</a> </p>",
      "rawMarkdown": "@gordonyip "
    }
  ],
  "comments": [
    {
      "id": 3258273,
      "author_name": "DennisSakva",
      "author_url": "",
      "post_date": "2025-07-30T13:28:28.937000",
      "content": "<p>Flat field corrects for uneven illumination due to how the telescope is built  (like vignetting in daytime photography) and differences in pixel sensitivities.<br>\nJitter is due to the telescope \"vibrating\" so the star quickly shifts from place to place on the sensor. <br>\nSo these two are not related.</p>",
      "votes": 4,
      "replies": []
    },
    {
      "id": 3257030,
      "author_name": "snehal",
      "author_url": "",
      "post_date": "2025-07-30T00:03:49.507000",
      "content": "<p><a href=\"https://www.kaggle.com/gordonyip\" target=\"_blank\">@gordonyip</a> </p>",
      "votes": 0,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "3258273": "Flat field corrects for uneven illumination due to how the telescope is built  (like vignetting in daytime photography) and differences in pixel sensitivities.\nJitter is due to the telescope \"vibrating\" so the star quickly shifts from place to place on the sensor. \nSo these two are not related.",
    "3254754": "Why does flat field correction not eliminate jitter noise? From what I’ve seen in the recommended readings it seems like the cause of jitter noise is non uniformity in the responsivity of each pixel. ",
    "3257030": "@gordonyip "
  }
}