projected length

the obtained images of the scallop are processed with image segmentation, dilation and erosion, and then characteristic numbers of the scallop are obtained. the shell length is identified by the calculation between projected area and shell length of scallop.

通过对获取的扇贝图像进行预处理、图像分割、膨胀腐蚀，提取扇贝的特征值，提出以扇贝投影面积作为扇贝图像的提取特征，通过投影面积与壳长的关系式计算识别壳长。

in proper seeding rate, the kernel length, width, projected area and length/ width were bigger, gel consistency was increased, peak, trough and breakdown were increased.

适宜的播种量条件下，稻米粒长、粒宽、投影面积变大，胶稠度较长，最高粘度、热浆粘度及崩解值较高。

the calculations between projected area and shell length of scallop are obtained by statistical analysis on proportion relation of scallop geometric feature.

通过统计虾夷扇贝几何尺寸间的比例关系，推导出扇贝投影面积与壳长的关系式。

the main results show: the ratios of the horizontal axial projected length of strengthening stage of skeleton curves of specimens to the yielding displacements are directly proportional to the transverse reinforcement characteristic values and inversely proportional to the axial compressive ratios and shear span ratios;

研究表明：轴压比超限时试验骨架曲线强化段在水平轴上的投影长度和屈服位移的比值与配箍特征值成正比，与轴压比和剪跨比成反比；