| 摘要 |
An infrared detector system in which a de-speckle filter is applied to image data generated by an infrared High Operating Temperature (HOT) detector array. The type of noise tackled is often known as ‘salt and pepper noise’. The filter reads the data associated with each pixel of the image generated and compares it with selected neighbouring pixels. The comparison yields a series of values that are compared to predetermined thresholds and the pixel is scored according to the number of values that exceed the threshold set. The score assigned to the pixel then determines the treatment of the pixel in the image to be generated. The data value of the pixel may be ignored, included or substituted with an alternative calculated value. The comparison may take the form of a subtraction. The number of neighbouring pixels used in the comparison may be four rather than eight. |
