Palm gesture recognition method and device as well as human-machine interaction method and apparatus

An open-or-closed palm gesture recognition device configured to recognize an open or closed palm gesture by utilizing image processing, the device comprising:

• an image obtainment part configured to obtain plural images according to an order of time;
• a palm shape image acquirement part configured to acquire plural palm shaped images from the plural images;
• a feature extraction part configured to extract plural features describing the open or closed palm gesture from each of the plural palm shaped images, wherein, each of the plural features has a monotonic characteristic that values corresponding to this feature obtained during a process between the open palm gesture and the closed palm gesture gradually decrease or increase;
• a maximum feature difference vector calculation part configured to calculate a maximum feature difference vector formed by a maximum difference of each of the plural features, wherein, the maximum difference of the corresponding feature, which has a sign attribute and a width attribute, is calculated by obtaining a difference related to the corresponding features between two of the plural palm shaped images according to a predetermined order, and an absolute value of the maximum difference is a maximum absolute value of a difference related to the corresponding features between any two of the plural palm shaped images;
• and
• an open-or-closed palm gesture determination part configured to determine, based on the maximum feature difference vector, that there is the open or closed palm gesture or there isn't the open or closed palm gesture in the plural images.