本研究主在探討矩量保持技術(moment-preserving)對彩色影像的分離
效果。其理論係根據MAcAdam ellipses所揭示人眼對顏色辨認的群聚性。
即不同的RGB值可能給人眼相同顏色的感覺。因此要將人眼所看為相同顏
色分離出來，不能只根據一個RGB值計算，必須包含某一範圍的RGB值。矩
量保持方法正好可以求出兩個或多個臨界值，而保留在臨界值範圍內所有
RGB值。當使用者以游標指到某一點時，該點的RGB值即被拾取，若較偏向
綠色則以9×9的遮罩計算平均值，若偏向紅色則以5×5的遮罩計算，若偏
向藍色則以3×3的遮罩計算，對於不在臨界值範圍內的像素RGB值， 則以
白色(255,255,255)或分離色的互補色呈現，以增強對比使視覺效果良好
。 根據實驗結果，証實以矩量保持方法所做的色彩分離效果，比傳統
的色彩查詢表(Look-Up Table)比對法所分離的顏色更接近人眼的主觀視
覺。其所含的同色系成分較多，在醫學影像、太空影像和罪案調查上更有
實用價值。

The purpose of this study is to investigate the effect of
colorsegmentation using moment-preserving technique.it is based
on the human eyes' chatacteristics of color clustering which was
discoveredby MacAdam in 1943. According to MacAdam's ellipses,
human eyes cannot recognize neighbor colors within limited
difference even though those colors located at different
coordinates of CIE colormap. It means that our eyes' color
sensitivity for different coloris different and can be figured
as clusters in MacAdam's ellipses.Among three primary colors,
blue is the most sensitive color for human eyes and then goes
red and green. But the LUT method which is considered as the
most precise color segmentation method cannot segment colorsas
our natural eyes do. The output image of LUT method contain the
pixelswith only one selected RGB value that is not available for
human visionin some cases, especially for the segmentation of
the colors with thesame hue but different saturation or
different brightness. In order tosimulate human eyes'color
segmentation function, a three order moment-preserving technique
is used to preserve sevral neighbor RGB value within two
threshold values . If the cursor is pointed to the color pixel
which color is closed to green, then a 9×9 mask is used to
calculatethe momentum of RGB values.And then output the image
which RGB valuesare within the calculated threshold values. If
the selected pixel which color is closed to red or blue, a 5×5
or 3×3 mask is used to do momentpreserving processing
separately.
The purpose of this study is to investigate the effect of