Imaging system, imaging apparatus, portable terminal apparatus, onboard apparatus, medical apparatus and method of manufacturing the imaging system

An imaging system comprising:

• an imaging lens;
• an imaging device that has a light receiving surface on which a plurality of light receiving pixels are two-dimensionally arrayed and that forms first image date based on an optical image of a subject projected onto the light receiving surface through the imaging lens and outputs the first image data corresponding to the subject;
• a coefficient storage section that will store a restoration coefficient corresponding to a state of a point image, which is projected onto the light receiving surface through the imaging lens and is expressed by the first image data output from the imaging device, when a maximum diameter of an effective region of the point image is equal to or larger than a size of three pixels;
• and
• a signal processing section that executes restoration processing on the first image data by using the restoration coefficient, the restoration processing being executed to generate second image data equivalent to the first image data output from the imaging device when the resolving power of the imaging lens is higher,
• wherein the signal processing section executes the restoration processing in a condition where a pixel region which has size equal to or larger than a size of nine pixels including three or more pixels in a vertical direction and three or more pixels in a horizontal direction on the light receiving surface is set as a minimum unit, and
• the imaging lens comprises:
• in order from an object side of the imaging lens, a first lens group which includes at least one lens and has a positive power;
• and a second lens group which includes at least one lens and in which a lens positioned closest to an image side of the imaging lens has a negative power, wherein a lens surface positioned closest to the image side in the second lens group has an off-axis inflection point.

An imaging system comprising:

• an imaging lens;
• an imaging device that has a light receiving surface on which a plurality of light receiving pixels are two-dimensionally arrayed and that forms first image date based on an optical image of a subject projected onto the light receiving surface through the imaging lens and outputs the first image data corresponding to the subject;
• a coefficient storage section that will store a restoration coefficient corresponding to a state of a point image, which is projected onto the light receiving surface through the imaging lens and is expressed by the first image data output from the imaging device, when a maximum diameter of an effective region of the point image is equal to or larger than a size of three pixels;
• and
• a signal processing section that executes restoration processing on the first image data by using the restoration coefficient, the restoration processing being executed to generate second image data equivalent to the first image data output from the imaging device when the resolving power of the imaging lens is higher,
• wherein the signal processing section executes the restoration processing in a condition where a pixel region which has size equal to or larger than a size of nine pixels including three or more pixels in a vertical direction and three or more pixels in a horizontal direction on the light receiving surface is set as a minimum unit, and
• the imaging lens comprises:
• in order from an object side of the imaging lens, a first lens group which includes at least one lens and has a positive power;
• and a second lens group which includes at least one lens and in which a lens positioned closest to an image side of the imaging lens has a negative power,
• wherein the imaging lens includes four single lenses,
• wherein the first lens group includes three single lenses and, wherein a first one positioned closest to the object side among the three single lenses has a positive power and an object-side surface of the first single lens is convex toward the object side, a second one adjacent to the first single lens among the three single lenses has a negative power and an image-side surface of the second single lens is convex toward the image side, and a third one positioned closest to the image side among the three single lenses has a positive power, and
• the second lens group includes one single lens.