Optical reader having reduced parameter determination delay
First Claim
1. A method for operating an optical reader having an image sensor, said method comprising the steps of:
- switching operation of said reader to a low resolution mode of operation; and
in said low resolution mode, clocking out electrical signals corresponding to some pixels of said image sensor at a higher than normal clock out rate so that an overall frame clock out rate is increased.
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Abstract
In the present invention, an optical reader image sensor is adapted to clock out image data from an image sensor according to “low resolution” mode of operation in order to reduce a parameter determination delay of the reader. In a low resolution mode, some pixels of the readers image sensor array are clock out at normal clock out speed sufficient to develop electrical signals accurately reflecting the intensity of light at the respective pixel positions, while other pixels of the array are either not clocked out or are clocked out at a higher clock out rate which may be insufficient to allow development of electrical signals that accurately represent light incident on the image sensor'"'"'s sensor array but which nevertheless, results in a reduction of the overall frame clock out rate of the frame of image data. An optical reader according to the invention operates in a low resolution frame clock out mode to capture a low resolution parameter determining frame of image data at high speed, reads pixel data from the parameter determination frame to determine an operation parameter based on actual illumination conditions, then utilizes the operation parameter in operating an optical reader.
296 Citations
147 Claims
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1. A method for operating an optical reader having an image sensor, said method comprising the steps of:
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switching operation of said reader to a low resolution mode of operation; and
in said low resolution mode, clocking out electrical signals corresponding to some pixels of said image sensor at a higher than normal clock out rate so that an overall frame clock out rate is increased. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for operating an optical reader having a CCD image sensor, said method comprising the steps of:
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(a) clocking out at least one frame of image data in a low resolution frame clock out mode of operation utilizing said CCD image sensor;
(b) reading pixel values from said at least one frame of image data clocked out in said low resolution clock out mode to determine an operating parameter of said reader;
(c) utilizing said operating parameter in developing a frame of image data; and
(d) decoding a decodable symbol representation represented in said frame of image data developed in step (c) utilizing said operating parameter. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68)
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69. An optical reader comprising:
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an imaging assembly having a CCD image sensor;
a controller, wherein said controller is adapted to clock out at least one low resolution frame of image data utilizing said CCD image sensor, wherein said controller is adapted to read pixel values from said at least one low resolution frame of image data to determine an operating parameter of said reader, wherein said controller is adapted to utilize said operating parameter in developing a subsequent from a image data, and wherein said controller is further adapted to decode a decodable symbol representation represented in said subsequent frame of image data developed utilizing said operating parameter. - View Dependent Claims (70, 71, 72, 73, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147)
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74. The optical reader of claim, wherein said controller develops said low resolution frame of image data by clocking out electrical signals corresponding to some pixels of said image sensor at a higher than normal nite.
Specification