Abstract: A positive electrode mixture layer for a lithium-ion secondary battery suitable for producing a lithium-ion secondary battery with high rate characteristics at an ordinary temperature and low temperatures and low internal resistance (DCR) at low temperatures, characterized by including a positive electrode active material, a binder, and a conductive additive, in which the conductive additive includes carbon black, a carbon nanotube (1) having an average fiber diameter of 80 to 400 nm, and a carbon nanotube (2) having an average fiber diameter of 0.4 to 3.0 nm, the content rates of the carbon black, the carbon nanotube (1), and the carbon nanotube (2) in the conductive additive are 40 to 80% by mass, 10 to 50% by mass, and 1 to 30% by mass, respectively, and the content rate of the conductive additive in the positive electrode mixed layer is 0.1 to 5.0% by mass.

Abstract: A partial image section is set as including part of a contour line of a particular image area in an original image appearing on a display screen. An image in the partial image section is binarized by referring to a selected threshold level. A boundary of the resulting binary image is detected for extraction of contour data in the partial image section. A plurality of such partial image sections are set successively in a way to partly overlap each other. Contour data (N2,M2) in an overlapping region of two adjacent partial image sections (Ni,Ni-1) are extracted by obtaining a plurality of dividing points (m.sub.0,n.sub.0,m.sub.1,n.sub.1, etc.