Abstract: Analog signals corresponding to color images or pixels of a thin section of a rock reservoir are digitized and then filtered to isolate the pixels representative of pores in the thin section. The pores so isolated are then counted, measured for their total pore perimeter and labelled.Each area of pixels representative of pores of value one is progressively eroded and dilated, pursuant to which one layer of pixels of ones on the perimeter of the area is converted to zeros and, if a seed pixel remains, one layer of pixels of ones is added to the perimeter of the area. Thereafter, the original object undergoes two successive erosions followed by two dilations if a seed pixel remains. Successive iterations of the erosion and dilation cycle continue until the last erosion eliminates the seed pixel of the area.

Abstract: Light transmitted through a thin section of reservoir rock whose pores are filled with blue-dyed epoxy is passed sequentially through red, blue and green filters and the density levels in the filtered images thereafter converted into pixels. The intensity, hue and saturation are then calculated from the red, blue and green components in each scene pixel. From the calculated values of intensity, hue and saturation, the pixels representative of pores and pores underlain by mineral are separated from the non-pore representative pixels.