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A chain code is a lossless compression based image segmentation method for binary images. The basic principle of chain codes is to separately encode each connected component, or "blob", in the image. For each such region, a point on the boundary is selected and its coordinates are transmitted. The encoder then moves along the boundary of the region and, at each step, transmits a symbol representing the direction of this movement. This encoding method is particularly effective for images consisting of a reasonably small number of large connected components.

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  • Freeman-Code (de)
  • Chain code (en)
  • Chain code (es)
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  • Der Freeman-Code (auch Kettencode oder Chain-Code) ist die pixelweise Kodierung einer Kontur oder Linie durch die Angabe, in welcher Richtung das nächste Pixel liegt. Er ist nach seinem Erfinder Herbert Freeman benannt. Für die Definition des Codes existieren unterschiedliche Varianten. (de)
  • A chain code is a lossless compression based image segmentation method for binary images. The basic principle of chain codes is to separately encode each connected component, or "blob", in the image. For each such region, a point on the boundary is selected and its coordinates are transmitted. The encoder then moves along the boundary of the region and, at each step, transmits a symbol representing the direction of this movement. This encoding method is particularly effective for images consisting of a reasonably small number of large connected components. (en)
  • Chain code es un algoritmo de compresión con pérdida para imágenes monocromáticas. El principio básico de chain code es codificar por separado cada componente conectado, o "blot", en la imagen. Para cada región, se selecciona un punto de su límite y se transmiten sus coordenadas. El codificador se mueve a lo largo del límite de la imagen y, en cada paso, transmite un símbolo representando la dirección de su movimiento. Esto continua hasta que el codificador retorna a la posición inicial, punto en el que el blot ha sido descrito completamente, y la codificación continua con el siguiente blot de la imagen. (es)
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  • A chain code is a lossless compression based image segmentation method for binary images. The basic principle of chain codes is to separately encode each connected component, or "blob", in the image. For each such region, a point on the boundary is selected and its coordinates are transmitted. The encoder then moves along the boundary of the region and, at each step, transmits a symbol representing the direction of this movement. This continues until the encoder returns to the starting position, at which point the blob has been completely described, and encoding continues with the next blob in the image. This encoding method is particularly effective for images consisting of a reasonably small number of large connected components. (en)
  • Der Freeman-Code (auch Kettencode oder Chain-Code) ist die pixelweise Kodierung einer Kontur oder Linie durch die Angabe, in welcher Richtung das nächste Pixel liegt. Er ist nach seinem Erfinder Herbert Freeman benannt. Für die Definition des Codes existieren unterschiedliche Varianten. (de)
  • Chain code es un algoritmo de compresión con pérdida para imágenes monocromáticas. El principio básico de chain code es codificar por separado cada componente conectado, o "blot", en la imagen. Para cada región, se selecciona un punto de su límite y se transmiten sus coordenadas. El codificador se mueve a lo largo del límite de la imagen y, en cada paso, transmite un símbolo representando la dirección de su movimiento. Esto continua hasta que el codificador retorna a la posición inicial, punto en el que el blot ha sido descrito completamente, y la codificación continua con el siguiente blot de la imagen. Este método de codificación es particularmente efectivo para imágenes consistentes en un número razonablemente alto de componentes conectados. Ejemplos de chain codes populares son: Freeman Chain Code of Eight Directions​ (FCCE), Vertex Chain Code​ (VCC), Three OrThogonal symbol chain code​ (3OT) and Directional Freeman Chain Code of Eight Directions​ (DFCCE). Un método de codificación blot relacionado es .​ El algoritmo permite convertir entre chain code, crack code, y run-length encoding. (es)
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