Abstract: Knife-holding assist including a blade-riding section and a grip section formed on two lateral sides of the blade-riding section. The blade-riding section has a U-shaped cross-section and includes a pair of opposite plate bodies integrally connected with each other. The plate bodies define a receiving channel, whereby a blade of the knife can be fitted into the receiving channel with the back edge of the blade abutting against the bottom of the receiving channel. The grip section includes two flat arched sections, whereby a user's hand can grip the grip section with the palm pressing an upper edge of the blade-riding section to facilitate cutting operation. The grip section also protects the fingers from slipping and getting hurt by the blade.

Abstract: A method and device for measuring depth of field for scanner includes placing a slant test chart above the scanning board. Scanning the test chart to obtain image of different heights. Dividing the image to multiple zones. Mapping image histogram of each zone to get a maximum and minimum value for calculating Modulation Transfer Function (MFT). Thereby to derive a line graph for depth of field distribution range. Based on that to adjust the CCD and lens to get the optimum focus point.