1. A tension control system for fiber bundles in a filament winding apparatus that applies a prescribed winding tension to a fiber bundle unwound from a fiber bundle feeding package and winds the tension-applied fiber bundle around a mandrel, the filament winding apparatus comprising:
a tension applying portion that applies the prescribed winding tension to the fiber bundle at a position that is immediately before a side of the mandrel between the fiber bundle feeding package and the mandrel;
a tension sensor that detects a tension of the fiber bundle between the fiber bundle feeding package and the tension applying portion; and
determination means that determines a tension abnormality of the fiber bundle by comparing pre-set reference information with a tension measured value measured by the tension sensor,
wherein the tension of the fiber bundle is controlled through the tension sensor between the fiber bundle feeding package and the tension applying portion.
2. The tension control system according to claim 1, wherein the determination means determines the tension abnormality when the tension measured value measured by the tension sensor exceeds a pre-set tension threshold value.
3. The tension control system according to claim 1, further comprising alerting means that generates an alert signal when the determination means determines the tension abnormality.
4. The tension control system according to claim 1, further comprising control means that stops a process of winding the fiber bundle around the mandrel when the determination means determines the tension abnormality.
5. The tension control system according to claim 1, further comprising display means for the determination means to monitor the tension measured value acquired by the tension sensor by measuring the tension of each of the fiber bundles with respect to each of the fiber bundle feeding packages.
6. The tension control system according to claim 5, wherein the determination means determines the tension abnormality with respect to each of the fiber bundle feeding packages by comparing the tension measured value of the fiber bundle of each of the fiber bundle feeding packages with each other on the display means.
7. The tension control system according to claim 5, wherein the determination means determines the tension abnormality with respect to each of the fiber bundle feeding packages by comparing tension fluctuations of the fiber bundle of each of the fiber bundle feeding packages with each other on the display means.
8. The tension control system according to claim 5, wherein the determination means includes storage means that stores a previously measured sampling average value of the fiber bundle, and the determination means determines the tension abnormality by comparing, on the display means, the sampling average value with the tension measured value measured by the tension sensor.
9. The tension control system according to claim 5, wherein the determination means displays, for monitoring, the tension measured value of the fiber bundle on the display means as waveform information representing an amount of temporal fluctuations.
10. The tension control system according to claim 1, wherein the tension sensor comprises a strain gauge.
11. The tension control system according to claim 10, wherein the tension sensor further comprises:
a guide wheel coaxially attached to a leading edge of a supporting rod that extends horizontally along a direction that is perpendicular to a running direction of the fiber bundle;
an elastic plate attached to a rear edge of the supporting rod, wherein the strain gauge is attached to the elastic plate; and
guide rollers below the guide wheel and supporting rod with space therebetween,
wherein the fiber bundle is guided by the guide wheel and guide rollers while being flexed.
12. The tension control system according to claim 1, wherein the tension applying portion comprises an air pressure adjusting member.
13. The tension control system according to claim 12, wherein the air pressure adjusting member supplies air pressure to cause the fiber bundle to be nipped between first and second nipping members, thereby applying the prescribed winding tension.
14. The tension control system according to claim 13, wherein:
the first nipping member is a side wall of a frame of the tension applying portion; and
the second nipping member is a press roller that is moved by air pressure supplied by the air pressure adjusting member.
15. A method for controlling tension in a filament winding apparatus that applies a prescribed winding tension to a fiber bundle unwound from a fiber bundle feeding package and winds the tension-applied fiber bundle around a mandrel, the method comprising:
applying the prescribed winding tension to the fiber bundle at a position that is immediately before a side of the mandrel between the fiber bundle feeding package and the mandrel;
detecting a tension of the fiber bundle between the fiber bundle feeding package and the tension applying portion;
determining a tension abnormality of the fiber bundle by comparing pre-set reference information with a tension measured value measured by the tension sensor; and
controlling the tension of the fiber bundle through the tension sensor between the fiber bundle feeding package and the tension applying portion.
16. The method for controlling tension according to claim 15, wherein the tension abnormality is determined when the tension measured value measured by the tension sensor exceeds a pre-set tension threshold value.
17. The method for controlling tension according to claim 15, further comprising generating an alert signal when the tension abnormality is determined.
18. The method for controlling tension according to claim 15, further comprising stopping a process of winding the fiber bundle around the mandrel when the tension abnormality is determined.
19. The method for controlling tension according to claim 15, further comprising displaying the tension measured value acquired by measuring the tension of each of the fiber bundles with respect to each of the fiber bundle feeding packages.
20. The method for controlling tension according to claim 19, wherein the tension abnormality is determined with respect to each of the fiber bundle feeding packages by comparing the displayed tension measured value of the fiber bundle of each of the fiber bundle feeding packages with each other.
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 method for detecting coding artifacts in an image, comprising:
filtering, with circuitry, the image with a block noise filter to at least reduce block noise in the image;
detecting, with the circuitry, an edge position of an edge in said image after filtering with the block noise filter;
detecting, with the circuitry, a border position of a border between a texture area and a flat area in said image after filtering with the block noise filter;
defining, with the circuitry, the area between said edge position and said border position as artifact area potentially comprising coding artifacts;
displaying artifact location information corresponding to the coding artifacts on a display, the artifact location information including a scalar image map;
defining a dilated edge area at least on the side of the detected edge position facing the detected border position, in particular on both sides of the detected edge position;
defining a dilated border area at least on the side of the detected border position facing the detected edge position, in particular on both sides of the detected border position; and
defining the overlapping area of said dilated edge area and said dilated border area between said edge position and said border position as said artifact area.
2. The method as claimed in claim 1, wherein said dilated edge area is defined by defining a block of a number of dilated edge area pixels around the edge pixels of the detected edge position, including an area around each edge pixel of the detected edge position, and by including the dilated edge area pixels into said dilated edge area.
3. The method as claimed in claim 2, further comprising:
defining an excluded edge area between the detected edge position and the detected border position, said excluded edge area covering the area from the detected edge position to the end of the corresponding edge, and
excluding said excluded edge area from said dilated edge area.
4. The method as claimed in claim 3, wherein said excluded edge area is defined by defining a block of a number of excluded edge area pixels around the edge pixels of the detected edge position, including an area around each edge pixel of the detected edge position, and by including the excluded edge area pixels into said excluded edge area.
5. The method as claimed in claim 1, wherein said dilated border area is defined by defining a block of a number of dilated border area pixels on the side of the border pixels facing the detected edge position, including on the side of each border pixel of the detected border position, and by including the dilated border area pixels into said dilated border area.
6. The method as claimed in claim 1, wherein said dilated border area is defined by defining a block of a number of dilated border area pixels around the border pixels of the detected border position, an area around each border pixel of the detected border position, and by including the dilated border area pixels into said dilated border area.
7. The method as claimed in claim 1, further comprising:
defining an excluded edge area between the detected edge position and the detected border position, said excluded edge area covering the area from the detected edge position to the end of the corresponding edge; and
excluding said excluded edge area from said artifact area.
8. The method as claimed in claim 1,
further comprising generating the artifact location information and the scalar image map comprising binary artifact indicator values, said artifact location information indicating the one or more areas of the image defined as artifact area.
9. The method as claimed in claim 8, further comprising evaluating said artifact location information to generate a scalar artifact percentage information indication the percentage of the image containing coding artifacts.
10. An apparatus for detecting coding artifacts in an image, comprising:
circuitry configured to
block filter the image to reduce block noise therein,
detect an edge position of an edge in said image after block filtering,
detect a border position of a border between a texture area and a flat area in said image after block filtering,
define the area between said edge position and said border position as artifact area potentially comprising coding artifacts,
display artifact location information corresponding to the coding artifacts on a display, the artifact location information including a scalar image map,
define a dilated edge area at least on the side of the detected edge position facing the detected border position, the dilated area being defined on both sides of the detected edge position,
define a dilated border area at least on the side of the detected border position facing the detected edge position, the dilated border area being defined on both sides of the detected border position, and
define the overlapping area of said dilated edge area and said dilated border area between said edge position and said border position as said artifact area.
11. A method for reducing coding artifacts in an image according to claim 1, further comprising:
reducing coding artifacts in image after block filtering by applying mosquito noise reduction andor deringing to only the detected artifact areas of the image.
12. An apparatus for reducing coding artifacts in an image according to claim 10, wherein the circuitry is further configured to:
reduce coding artifacts in said image after block filtering by applying a step of mosquito noise reduction andor deringing to only the detected artifact areas of the image.
13. A non-transitory computer-readable medium encoded with computer readable instructions thereon that, when executed by a computer, cause the computer to perform a method according to claim 1.
14. An apparatus for detecting coding artifacts in an image, comprising:
means for block filtering the image to reduce block noise therein;
first detection means for detecting an edge position of an edge in said image after block filtering;
second detection means for detecting a border position of a border between a texture area and a flat area in said image after block filtering;
defining means for defining the area between said edge position and said border position as artifact area potentially comprising coding artifacts;
means for displaying artifact location information corresponding to the coding artifacts on a display, the location artifact information including a scalar image map;
means for defining a dilated edge area at least on the side of the detected edge position facing the detected border position, in particular on both sides of the detected edge position;
means for defining a dilated border area at least on the side of the detected border position facing the detected edge position, in particular on both sides of the detected border position; and
means for defining the overlapping area of said dilated edge area and said dilated border area between said edge position and said border position as said artifact area.
15. The apparatus for reducing coding artifacts in an image according to claim 14, further comprising:
means for reducing coding artifacts in said image after block filtering by applying mosquito noise reduction andor deringing to only the detected artifact areas of the image.
16. A device for processing andor displaying images comprising circuitry to perform the method claim 1.
17. The device according to claim 16, wherein the device is one of a camera, a TV set, a computer, a broadcasting unit and a video player.