{
  "id": 642450,
  "title": "Aspect ratio between physical quadrants and digital images.",
  "url": "/competitions/csiro-biomass/discussion/642450",
  "author_name": "ma7555",
  "post_date": "2025-11-28T00:51:36.700000",
  "votes": 16,
  "comment_count": 0,
  "views": 0,
  "content": "<p>The paper mentions that:</p>\n<ol>\n<li>The data collection sequence began with precise quadrat placement using a standardized 70cm × 30cm metal frame positioned directly on the pasture surface.</li>\n<li>The final biomass measurements represent dry matter content collected within a standardized 70cm × 30cm quadrat frame, enabling precise component-wise quantification critical for detailed pasture analysis.</li>\n<li>Figure 1: Sample images from the training set and their labels. Images cropped to show the internal section of the 70 x 30cm quadrants, and with dry weight of biomass fractions shown (Green, Dead, Clover).</li>\n<li>The pipeline applied perspective correction using affine transformation to convert\ntrapezoidal ROIs into standardized rectangles. Following this, images were resampled to a uniform resolution of\n2,000×1,000 pixels, with aspect ratio preservation maintained throughout to prevent geometric distortion that could\ncompromise biomass estimation accuracy.</li>\n</ol>\n<p>Physical Reality: 70cm x 30cm (Ratio 2.33 : 1)\nDigital Reality: 2000px x 1000px (Ratio 2.0 : 1)</p>\n<p>How is that possible to have physical aspect ratio of 2.33:1 but 2:1 digitally without distortion?</p>",
  "messages": [
    {
      "id": 3350911,
      "postDate": "2025-11-28T00:51:36.700Z",
      "content": "<p>The paper mentions that:</p>\n<ol>\n<li>The data collection sequence began with precise quadrat placement using a standardized 70cm × 30cm metal frame positioned directly on the pasture surface.</li>\n<li>The final biomass measurements represent dry matter content collected within a standardized 70cm × 30cm quadrat frame, enabling precise component-wise quantification critical for detailed pasture analysis.</li>\n<li>Figure 1: Sample images from the training set and their labels. Images cropped to show the internal section of the 70 x 30cm quadrants, and with dry weight of biomass fractions shown (Green, Dead, Clover).</li>\n<li>The pipeline applied perspective correction using affine transformation to convert\ntrapezoidal ROIs into standardized rectangles. Following this, images were resampled to a uniform resolution of\n2,000×1,000 pixels, with aspect ratio preservation maintained throughout to prevent geometric distortion that could\ncompromise biomass estimation accuracy.</li>\n</ol>\n<p>Physical Reality: 70cm x 30cm (Ratio 2.33 : 1)\nDigital Reality: 2000px x 1000px (Ratio 2.0 : 1)</p>\n<p>How is that possible to have physical aspect ratio of 2.33:1 but 2:1 digitally without distortion?</p>",
      "rawMarkdown": "The paper mentions that:\n\n1. The data collection sequence began with precise quadrat placement using a standardized 70cm × 30cm metal frame positioned directly on the pasture surface.\n2. The final biomass measurements represent dry matter content collected within a standardized 70cm × 30cm quadrat frame, enabling precise component-wise quantification critical for detailed pasture analysis.\n3. Figure 1: Sample images from the training set and their labels. Images cropped to show the internal section of the 70 x 30cm quadrants, and with dry weight of biomass fractions shown (Green, Dead, Clover).\n4. The pipeline applied perspective correction using affine transformation to convert\ntrapezoidal ROIs into standardized rectangles. Following this, images were resampled to a uniform resolution of\n2,000×1,000 pixels, with aspect ratio preservation maintained throughout to prevent geometric distortion that could\ncompromise biomass estimation accuracy.\n\nPhysical Reality: 70cm x 30cm (Ratio 2.33 : 1)\nDigital Reality: 2000px x 1000px (Ratio 2.0 : 1)\n\nHow is that possible to have physical aspect ratio of 2.33:1 but 2:1 digitally without distortion?",
      "votes": 16
    }
  ],
  "comments": [],
  "raw_markdown_by_id": {
    "3350911": "The paper mentions that:\n\n1. The data collection sequence began with precise quadrat placement using a standardized 70cm × 30cm metal frame positioned directly on the pasture surface.\n2. The final biomass measurements represent dry matter content collected within a standardized 70cm × 30cm quadrat frame, enabling precise component-wise quantification critical for detailed pasture analysis.\n3. Figure 1: Sample images from the training set and their labels. Images cropped to show the internal section of the 70 x 30cm quadrants, and with dry weight of biomass fractions shown (Green, Dead, Clover).\n4. The pipeline applied perspective correction using affine transformation to convert\ntrapezoidal ROIs into standardized rectangles. Following this, images were resampled to a uniform resolution of\n2,000×1,000 pixels, with aspect ratio preservation maintained throughout to prevent geometric distortion that could\ncompromise biomass estimation accuracy.\n\nPhysical Reality: 70cm x 30cm (Ratio 2.33 : 1)\nDigital Reality: 2000px x 1000px (Ratio 2.0 : 1)\n\nHow is that possible to have physical aspect ratio of 2.33:1 but 2:1 digitally without distortion?"
  }
}