1. An apparatus for embedding a digital watermark in a document image, comprising:
outer shape extraction means for extracting outer shapes, which include a first outer shape in a first line, a second outer shape in a second line different from the first line, a third outer shape in the first line and a fourth outer shape in a third line different from the first line, of characters in the document image; and
control means for controlling at least one of the outer shapes so that a parameter concerned with a distance between the first and the second outer shapes and a parameter concerned with a distance between the third and the fourth outer shapes are different from each other in correspondence with digital watermark information to be embedded,
wherein each of the parameters is concerned with the distance calculated using left edges or right edges of each outer shape.
2. The apparatus according to claim 1, wherein said control means changes the position of at least one of the first to fourth outer shapes.
3. The apparatus according to claim 1, wherein said control means changes the size of at least one of the first to fourth outer shapes.
4. The apparatus according to claim 1, wherein a set of the first and second outer shapes is spaced a distance corresponding to a predetermined number of outer shapes from a set of the third and fourth outer shapes.
5. An apparatus for extracting data embedded in a document image, comprising:
outer shape extraction means for extracting outer shapes, which include a first outer shape in a first line, a second outer shape in a second line different from the first line, a third outer shape in the first line and a fourth outer shape in a third line different from the first line, of characters in the document image; and
extraction means for comparing a parameter concerned with a distance between the first and the second outer shapes with a parameter concerned with a distance between the third and the fourth outer shapes, and extracting data corresponding to a comparison result of the parameters as data embedded in the document image,
wherein each of the parameters is concerned with the distance calculated using left edges or right edges of each outer shape.
6. A method for embedding a digital watermark in a document image, comprising:
an outer shape extraction step of extracting outer shapes, which include a first outer shape in a first line, a second outer shape in a second line different from the first line, a third outer shape in the first line and a fourth outer shape in a third line different from the first line, of characters in the document image; and
a control step of controlling at least one of the outer shapes so that a parameter concerned with a distance between the first and the second outer shapes and a parameter concerned with a distance between the third and the fourth outer shapes are different from each other in correspondence with digital watermark information to be embedded,
wherein each of the parameters is concerned with the distance calculated using left edges or right edges of each outer shape.
7. A method for extracting data embedded in a document image, comprising:
an outer shape extraction step of extracting outer shapes, which include a first outer shape in a first line, a second outer shape in a second line different from the first line, a third outer shape in the first line and a fourth outer shape in a third line different from the first line, of characters in the document image; and
an extraction step of comparing a parameter concerned with a distance between the first and the second outer shapes with a parameter concerned with a distance between the third and the fourth outer shapes, and extracting data corresponding to a comparison result of the parameters as data embedded in the document image,
wherein each of the parameters is concerned with the distance calculated using left edges or right edges of each outer shape.
8. A program embodied in a computer-readable memory medium for making a computer execute the digital watermark embedding method of claim 6.
9. A program embodied in a computer-readable memory medium for making a computer execute the digital watermark extraction method of claim 7.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A blade structure in a gas turbine, comprising:
stationary blades arrayed in a circle on a casing;
moving blades arrayed in a circle on a rotor, wherein seal-air flows from the rotor side at the upstream of the moving blades, wherein
a front-edge including angle at a hub portion of the stationary blade is larger than a front-edge including angle at other portions than the hub portion of the moving blade.
2. A blade structure in a gas turbine, comprising:
stationary blades arrayed in a circle on a casing;
moving blades arrayed in a circle on a rotor, wherein seal-air flows from the rotor side at the upstream of the moving blades, wherein
an entrance metal angle at a hub portion of the stationary blade is smaller than an entrance metal angle at other portions than the hub portion of the moving blade.
3. A blade structure in a gas turbine, comprising:
stationary blades arrayed in a circle on a casing;
moving blades arrayed in a circle on a rotor, wherein seal-air flows from the rotor side at the upstream of the moving blades, wherein
a front-edge including angle at a hub portion of the stationary blade is larger than a front-edge including angle at other portions than the hub portion of the moving blade, and also an entrance metal angle at a hub portion of the stationary blade is smaller than an entrance metal angle at other portions than the hub portion of the moving blade.