Biological image processing device, biological image processing method, and computer-readable non-transitory medium

A biological image processing method, comprising:

• extracting at least one line from contours of a palm and principal lines of the palm shown in an image of the palm;
• extracting pixels of the line extracted by the line extracting unit;
• setting a local region for each of the pixels, each local region including each corresponding one of the pixels;
• calculating, for each local region, local orientations of the line extracted by the line extracting unit, in accordance with gradient intensities related to respective orientations of each corresponding local region;
• calculating an orientation of the palm in accordance with a statistical amount of the respective local orientations;
• and
• rotating the palm of the image, based on the orientation of the palm.

A computer readable, non-transitory medium storing a program that causes a computer to execute a process, the process comprising:

• extracting at least one line from contours of a palm and principal lines of the palm shown in an image of the palm;
• extracting pixels of the extracted line;
• setting a local region for each of the pixels, each local region including each corresponding one of the pixels;
• calculating, for each local region, local orientations of the extracted line, in accordance with gradient intensities related to respective orientations of each corresponding local region;
• calculating an orientation of the palm in accordance with a statistical amount of the respective local orientations;
• and
• rotating the palm of the image, based on the orientation of the palm.