Angle de-skew device and method thereof
First Claim
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1. An angle de-skew device used in an image processing system to rotate a skewed image according to a reference point as rotated center, comprising:
- a first accumulator circuit to accumulate X coordinate value of a first pixel of the skewed image by a first offset and to output one and upward first accumulation results into the image processing system;
a second accumulator circuit to accumulate Y coordinate value of a first pixel of the skewed image by a second offset and to output one and upward second accumulation results into the image processing system; and
a counter connected with the first and second accumulator circuit to control the number of accumulation times of the first and second accumulator circuits;
wherein the first accumulator circuit includes;
an adder to accumulate the first offset and output the first accumulation results;
a delay circuit to receive the first accumulation results from the adder and feed the first accumulation results back to the adder according to a control signal;
a buffer to receive the first accumulation results from the delay circuit and output the first accumulation results into the image processing system according to the control signal.
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Abstract
An angle de-skew device and the method thereof are used in an image processing system to rotate a skewed image with respect to a reference point as a rotated center. First and second accumulator circuits respectively are used to accumulate first and second offsets for the X coordinates and Y coordinates of the first pixel in the skewed image, and respectively output the sums into the image processing system. A counter is connected to the two accumulator circuits to control the number of accumulation times.
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Citations
7 Claims
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1. An angle de-skew device used in an image processing system to rotate a skewed image according to a reference point as rotated center, comprising:
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a first accumulator circuit to accumulate X coordinate value of a first pixel of the skewed image by a first offset and to output one and upward first accumulation results into the image processing system; a second accumulator circuit to accumulate Y coordinate value of a first pixel of the skewed image by a second offset and to output one and upward second accumulation results into the image processing system; and a counter connected with the first and second accumulator circuit to control the number of accumulation times of the first and second accumulator circuits; wherein the first accumulator circuit includes; an adder to accumulate the first offset and output the first accumulation results; a delay circuit to receive the first accumulation results from the adder and feed the first accumulation results back to the adder according to a control signal; a buffer to receive the first accumulation results from the delay circuit and output the first accumulation results into the image processing system according to the control signal. - View Dependent Claims (2, 3)
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4. An angle de-skew device used in an image processing system to rotate a skewed image according to a reference point as rotated center, comprising:
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a first accumulator circuit to accumulate X coordinate value of a first pixel of the skewed image by a first offset and to output one and upward first accumulation results into the image processing system; a second accumulator circuit to accumulate Y coordinate value of a first pixel of the skewed image by a second offset and to output one and upward second accumulation results into the image processing system; and a counter connected with the first and second accumulator circuit to control the number of accumulation times of the first and second accumulator circuits, wherein the second accumulator circuit includes; an adder to accumulate the second offset and output the second accumulation results; a delay circuit to receive the second accumulation results from the adder and feed the second accumulation results back to the adder according to a control signal; a buffer to receive the second accumulation results from the delay circuit and output the second accumulation results into the image processing system according to the control signal. - View Dependent Claims (5)
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6. An angle de-skew method used in an image processing system to rotate a skewed image according to a reference point as a rotated center, comprising the steps of:
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accumulating a X coordinate value of a first pixel of the skewed image by a first offset and accumulating a Y coordinate value of a first pixel of the skewed image by a second offset; computing the number of accumulation times of the first and second offsets according to the angle that the skewed image is to be rotated; and outputting accumulation results in sequence to the image processing system, wherein the image processing system rotates the skewed image according to the accumulation results. - View Dependent Claims (7)
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Specification