During the dehydration process

tissue cells in different locations undergo diffusion and evaporation of water

and other microstructural changes such as cell shrinkage

rupture

and pore formation often occur. Changes in the cell microstructure affect the moisture and temperature distributions in the material and the quality of the material. Therefore

studying the change law of the cell microstructure at different positions is vital for improving material quality. This study used microscopic observation and image processing technology to study the changes in the morphology of cells in different positions of the sample during the process of water migration

and the changes in size parameters (relative diameter

relative perimeter

relative area

and area) and shape parameters (roundness and elongation) of cells at different positions at 0 oC and 8 oC were analyzed. The results showed that during the dehydration process

the maximum value of the size parameter at different moments at 0 oC was obtained at the middle of the section center and the lower tissue edge. The maximum value at 8 oC was obtained at the center of the section. The relative cell diameter

relative perimeter

and relative area changes exhibited the same trend

but the relative area changed more. The shape parameters were distributed within a range without obvious uniformity. At 0 oC

the cell roundness was roughly distributed in the range of 0.85 to 0.95

and the cell elongation rate was concentrated in the range of 1.2 to 1.8. At 8 oC

the cell roundness was roughly distributed in the range of 0.80 to 0.90

and the cell elongation rate was concentrated between 1.2 and 1.9. At 0~30 min

the change in the dimensional parameters at each position increased with an increase in temperature. Compared to that at 0 oC

the shrinkage of the cells was significantly higher at 8 oC during the dehydration process

and the overall change trend of the cell shape was more uniform.