JPH08212286A - Information reproduction system - Google Patents

Abstract

PURPOSE: To make a sensor detection signal to correspond to a dot code pattern correctly and to process such a sensor detection signal at a high speed. CONSTITUTION: An image pickup processing part 18 in a reading part 10 constitutes on one chip a dot code reading sensor 26 for reading a dot code, optical distortion reading sensors 28A to 28D for detecting optical distortion arranged around it, an A/D conversion part 30 and a logic circuit 32 controlling these sensors 26, 28A to 28D and the A/D conversion part 30. Corresponding to the signal of these optical distortion reading sensors 28A to 28D, the logic circuit 32 controls the binarization level of the output signal of the dot code reading sensor 26 in the A/D conversion part 30 to be varied. A binary signal from an image pickup processing part 18 is converted into a data signal at a picture processing part 20 and converted into a video or sound signal at a data signal processing part 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to so-called multimedia including audio information such as voice and music, video information obtained from cameras and video equipment, and digital code data obtained from personal computers and word processors. The present invention relates to an information reproducing system which reproduces original multimedia information by optically reading the code pattern from an information recording medium such as paper in which information is recorded as an optically readable two-dimensional code pattern.

[0002]

2. Description of the Related Art Conventionally, various media such as magnetic tapes and optical disks have been known as media for recording voice, music and the like. However, even if a large number of copies of these media are made, the unit price will be high to some extent, and a large amount of space will be required for their storage. Furthermore, when it is necessary to hand over a medium on which voice is recorded to another person in a remote place, it takes time and effort to send it by mail or bring it directly. There was also. In addition to audio information, video information obtained from cameras, video equipment, etc., and digital code data obtained from personal computers, word processors, etc.,
The same applies to the so-called multimedia information as a whole including the above.

As a solution to such a problem, Japanese Patent Laid-Open No. 6-231466 discloses that multimedia information including at least one of audio information, video information and digital code data can be transmitted by facsimile. In addition, a plurality of dots are arranged two-dimensionally as image information, that is, coded information, which enables large-scale copying at low cost.
A system for recording on an information recording medium such as paper in the form of a dimensional code pattern and a system for reproducing the same are disclosed.

The two-dimensional code pattern disclosed in this publication is as shown in FIG. That is, this figure corresponds to FIG. 14 in the above publication, and
The dot code 170 as a dimension code pattern is shown. In the data format of the dot code 170, one block 172 includes a marker 174, a block address 176, address error detection / correction data 178, and a data area 180 in which actual data is stored. And this block 172
Are arranged vertically, horizontally, and two-dimensionally, and they are gathered to form a dot code 170.

Further, FIG. 7 corresponds to FIG. 15 of the above publication and is a diagram showing a configuration of a multimedia information reproducing apparatus. This information reproducing apparatus includes a detection unit 184 for reading the dot code from a sheet 182 on which the dot code 170 is printed, a scan conversion unit 186 for recognizing the image data supplied from the detection unit 184 as a dot code and performing normalization. A binarization processing unit 188 for converting multi-valued data into a binary value, a demodulation unit 190, an adjustment unit 192 for adjusting a data string, a data error correction unit 194 for correcting a read error and a data error at the time of reproduction, and an attribute of each data. And a decompression processing unit for data compression processing according to each attribute, a display unit or a reproduction unit, or another input device.

In the detection unit 184, the dot code 170 on the sheet 182 is illuminated by the light source 198, and the reflected light is provided with the imaging optical system 200 such as a lens and the spatial filter 202 for removing moire and the like. The image information is converted into an electric signal through an image pickup unit 204 such as a CCD or CMD, which is detected as an image signal, amplified by a preamplifier 206, and output. The light source 198, the imaging optical system 200, the spatial filter 202, the imaging unit 204, and the preamplifier 20.
Reference numeral 6 denotes an external light shielding portion 208 for preventing external light disturbance.
Composed within. The image signal amplified by the preamplifier 206 is converted into digital information by the A / D conversion unit 210 and supplied to the scan conversion unit 186 at the next stage.

The image pickup section 204 is controlled by the image pickup section control section 212. For example, when an interline transfer type CCD is used as the imaging unit 204,
The image pickup unit control unit 212 stores a V blank signal for vertical synchronization, an image pickup device reset pulse signal for resetting information charges, and a charge transfer accumulation unit arranged two-dimensionally as control signals for the image pickup unit 204. Charge transfer gate pulse signal for transmitting the electric charge to a plurality of vertical shift registers, and a horizontal charge transfer CLK which is a transfer clock signal of the horizontal shift register for transferring the electric charge in the horizontal direction and outputting it to the outside.
A signal, a vertical charge transfer pulse signal for vertically transferring the plurality of vertical shift register charges and sending the charges to the horizontal shift register, and the like are output.

Then, the image pickup section control section 212 gives the light source a light emitting cell control pulse for timing the light emission of the light source 198 in synchronization with this timing.
The image data is read from the V blank of this one field to the V blank. The light source 198 performs pulse lighting instead of continuous lighting, and performs subsequent pulse lighting in synchronization with each field. In this case, during the V blanking period, in order to prevent clock noise for pulse lighting from entering the signal output,
That is, the timing is controlled such that exposure is performed while image charges are not being output. That is, the light emitting cell control pulse is a very thin digital clock pulse that is generated instantaneously and gives a large amount of power to the light source, so it is possible to prevent noise due to it from entering the analog image signal. This is necessary, and as a measure therefor, the light source is pulsed during the V blanking period. By doing so, the S / N is improved. Further, pulse lighting means shortening the light emission time, and thus has a great effect of eliminating the influence of blurring due to shake and movement of manual operation. This enables high-speed scanning.

In addition, in order to minimize the S / N deterioration even when a disturbance such as external light enters due to some reason in spite of the presence of the external light shielding portion 208 due to the playback apparatus tilting or the like. , Immediately before the light source 198 is caused to emit light in the V blanking period, the image sensor reset pulse is output once to reset the image signal, light is emitted immediately after that, and immediately thereafter.
I try to read it.

Next, the scan conversion unit 186 will be described. The scan conversion unit 186 is a unit that recognizes the image data supplied from the detection unit 184 as a dot code and performs normalization. As the method, first, the image data from the detection unit 184 is stored in the image memory 214, and once read out from the image memory 214, it is sent to the marker detection unit 216. The marker detection unit 216 detects a marker for each block. Then, the data array direction detection unit 218 detects the rotation or inclination and the data array direction using the marker.
Based on the result, the address controller 220 reads out the image data from the image memory 214 so as to correct it and supplies it to the interpolation circuit 222. At this time, lens aberration information is read from the memory 224 for correcting distortion of lens aberration in the imaging optical system 200 of the detection unit 184, and lens correction is also performed. Then, the interpolation circuit 222
Performs an interpolation process on the image data and converts it into the original dot code pattern.

The output of the interpolation circuit 222 is the binarization processing unit 1.
88. Basically, as can be seen from FIG. 6, the dot code 170 is a black and white pattern, that is, binary information, and thus is binarized by the binarization processing unit 188. At that time, the threshold determination circuit 226 adaptively performs binarization while determining the threshold in consideration of the influence of disturbance, the influence of the signal amplitude, and the like.

Since the data is modulated at the time of recording, the demodulation unit 190 first demodulates it, and then the data is input to the data string adjustment unit 192. In the data string adjusting unit 192, first, the block address detecting unit 228 detects the block address of the above-mentioned two-dimensional block,
After that, the block address error detection / correction unit 230 performs block address error detection / correction, and then the address control unit 232 stores the data in the block unit in the data memory unit 234. By storing data in block address units in this way, data can be stored without waste even if data is skipped midway or entered midway.

After that, the data read from the data memory unit 234 is corrected by the data error correction unit 194. The output of the error correction unit 194 is branched into two, and one of them is sent as digital data to a personal computer, a word processor, an electronic notebook, etc. via the I / F 236. The other is supplied to the data separation unit 196, where images, handwritten characters and graphs, characters and line drawings,
Sound (2: the original sound and the one with speech synthesis)
Types).

The image corresponds to a natural image and is a multivalued image. The decompression processing unit 238 performs decompression processing corresponding to JPEG at the time of compression, and the data interpolation circuit 240 further interpolates error-uncorrectable data.

Further, with respect to binary image information such as handwritten characters and graphs, the decompression processing unit 242 performs decompression processing for MR / MH / MMR and the like performed by compression, and further the data interpolation circuit 244. Interpolation of data that cannot be error-corrected is performed.

Characters and line drawings are converted into another pattern for display through a PDL (page description language) processing unit 246. In this case, as for the line drawing and the characters, if the compression processing for the code is performed after being encoded, the expansion processing unit 248 corresponding thereto performs the expansion (Huffman, Gibblempel, etc.) processing, and then PD
It is adapted to be supplied to the L processing unit 246.

The data interpolation circuits 240, 244 and P
The output of the DL processing unit 246 is the synthesis or switching circuit 25.
The data is combined or selected by 0, converted into an analog signal by the D / A converter 252, and then displayed on a display device 254 such as a CRT (television monitor) or FMD (face mounted display). The FMD is a spectacles-type monitor (handy monitor) for wearing on the face, and is effective for applications such as virtual reality, and for viewing a large screen in a small place.

For the voice information, the decompression processing unit 2
At 56, decompression processing is performed on the ADPCM, and at the data interpolating circuit 258, error-uncorrectable data is interpolated. Alternatively, in the case of voice synthesis, the voice synthesis unit 260 receives the voice synthesis code, synthesizes the voice from the code, and outputs the synthesized voice. In this case,
When the code itself is compressed, the decompression processing unit 262 performs decompression processing such as Huffman or Jiblempel in the same manner as the above character and line drawing, and then performs voice synthesis.

The data interpolator 258 and the voice synthesizer 26
The output of 0 is synthesized or selected by the synthesis or switching circuit 264, converted into an analog signal by the D / A conversion unit 266, and then output to a speaker, headphones, or other similar audio output device 268.

Characters and line drawings are directly output from the data separation unit 196 to the page printer, plotter, etc. 270, and the characters are printed on paper as word processing characters, or the line drawings are output as plotters as drawings. It can also be done.

Of course, for images, CRT and FM
Not only D, it is also possible to print with a video printer or the like, and it is also possible to take a picture of the image. Then, in such an information reproducing apparatus, for example, the detection unit 184 and the scan conversion unit 186 are housed in a pen-shaped housing, and the dot code 1 on the sheet 182 is formed.
As a reading unit that optically reads 70, the reading unit is held by hand, and the code is read by manually scanning the sheet 182 along the recorded dot code 170.

Further, in the above publication, the light source 198, the imaging optical system 200, the spatial filter 202, the image pickup section 204,
A detection unit 184 including a preamplifier 206 and an imaging unit control unit 212 is provided at the tip thereof, and a scan conversion unit 186, a binarization processing unit 188, a demodulation unit 190, a data error correction unit 194, an expansion processing unit 256, and data. Interpolation circuit 25
8, etc. are built in as an image processing unit, a data processing unit, and a data output unit, and an earphone as a voice output device 268,
It also discloses a pen-type information reproducing device to which an output device for images, characters, line drawings, etc. can be connected.

[0023]

By the way, the system disclosed in the above publication has a configuration in which the image pickup unit 204 and the signal processing unit are separated, and is based on the fact that the signal is treated as one-dimensional serial data. ing.

In such an information reproducing system, when the dot code 170 (two-dimensional code pattern) is optically read, the positional relationship between the dot code 170, the light source 198 and the image pickup section 204 (sensor) and the dot code 170.
The signal strength detected by the sensor constantly changes depending on the material, stains, deflection, etc. of the recording medium such as the sheet 182. However, the reproduction system disclosed in the above publication does not consider this point.

Further, in general, if the signal from the sensor is processed serially, the processing time per pixel is short and complicated processing cannot be performed. Therefore, there is a problem that it takes time to perform a complicated process such as reproducing the dot code to the original multimedia information.

The present invention has been made in view of the above points, and an information reproducing system capable of accurately corresponding a sensor detection signal to a two-dimensional code pattern and processing such a sensor detection signal at high speed. The purpose is to provide.

[0027]

In order to achieve the above object, the information reproducing system according to the present invention is capable of optically reading multimedia information including at least one of audio information, video information and digital code data. Image pickup means for optically reading the two-dimensional code pattern from an information recording medium having a portion recorded with a different two-dimensional code pattern, and 2 read by the image pickup means.
An information reproducing system comprising a restoring means for processing a dimension code pattern to restore the original multimedia information, and an outputting means for reproducing and outputting each information based on an output signal from the restoring means, in particular, A code reading sensor for optically reading a two-dimensional code pattern on the information recording medium; and an optical strain reading sensor arranged near the code reading sensor for detecting optical distortion. Correction means for correcting the sensor detection signal of the code reading sensor based on the sensor detection signal of the optical distortion reading sensor.

[0028]

According to the information reproducing system of the present invention,
An optical distortion reading sensor for detecting optical distortion is arranged in the vicinity of a code reading sensor for optically reading the dimensional code pattern, and the correction unit is configured to detect the optical distortion based on a sensor detection signal of the optical distortion reading sensor. The sensor detection signal of the code reading sensor is corrected. Therefore, an accurate two-dimensional code can be read.

[0029]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a diagram showing the configuration of the reading unit 10 used in the information reproducing system according to the first embodiment of the present invention.
It has a pen-like shape so that the operator can hold it by hand and scan a dot code as a two-dimensional code pattern recorded on the recording medium 12 such as a sheet.

The reading unit 10 includes a first LED 14 as a light source having different wavelengths for illuminating a dot code.
And the second LED 16, an imaging processing unit 18 corresponding to a detection unit including, for example, an imaging unit and a control circuit thereof, an image processing unit 20 including a scan conversion unit and a binarization processing unit, and a demodulation unit, for example. A data processing unit 22 including a data error correction unit, a decompression processing unit, a data interpolation circuit, and the like, and a power supply unit 24 such as a battery for supplying power to these units are incorporated.

In this case, for example, the wavelength of the light emitted from the first LED 14 is a wavelength in the visible range where the presence or absence of the dot code can be detected, and the wavelength of the light emitted from the second LED 16 is the dot code. Is a wavelength that is reflected on the sheet 12, for example.

In the image pickup processing unit 18, the image pickup unit separates the two kinds of wavelengths by a filter (not shown) and picks up an image, and outputs a binarized signal corresponding to the dot code picked up by the two kinds of wavelengths. The image processing unit 20 converts this into a data signal, and the data signal processing unit 22 converts this processed and reproduced data signal into a video signal or an audio signal, and performs processing so that it can be actually used.

The image pickup processing section 18 is constructed, for example, as shown in FIG. That is, the image pickup device 18 includes a dot code reading sensor 26 for reading a dot code, optical distortion reading sensors 28A to 28D arranged around the dot code reading sensor 26, and A / A for reading optical distortion.
The D conversion unit 30 and the logic circuit (imaging unit control circuit) 32 that controls the sensors 26, 28A to 28D and the A / D conversion unit 30 are configured on one substrate. In this case, these may be configured as a one-chip integrated circuit by a semiconductor manufacturing method.

As the dot code reading sensor 26, an image pickup device such as a CCD or an xy address type image pickup device such as a memory and a randomly accessible CMD is used. Further, the optical strain reading sensors 28A to 28 described above.
As a signal detected by D, for example, a near-ultraviolet pass filter is arranged in front of these sensors 28A to 28D so that a near-ultraviolet signal can be detected, although not particularly shown.

The positional relationship between the dot code and the light source, the image pickup section (dot code reading sensor 26), the material on which the dot code is recorded such as the sheet, the stain, and the deflection (these are referred to as optical distortion in this specification). ), The signal intensity detected by the dot code reading sensor 26 changes. Therefore, the logic circuit 32
Controls the binarization level of the output signal of the dot code reading sensor 26 in the A / D converter 30 in accordance with the signals of the optical distortion reading sensors 28A to 28D.

That is, as shown in FIG. 2A, the analog signal from the dot code reading sensor 26 read by the scan signal from the scan signal generator 34 of the logic circuit 32 is converted into an A / D converter 30. Is converted into digital image data and output to the image processing unit 20. At this time, the sensor detection signals of the four optical distortion reading sensors 28 (28A to 28D) arranged around the dot code reading sensor 26 are respectively output by the weighted averaging unit 34 of the logic circuit 32 to the dot code reading sensor. The signal at the position corresponding to the position of the pixel read from the pixel 26 is weighted averaged, and the weighted average value is further input to convert the dot into a correction signal of the conversion level of the A / D conversion unit 30 through a lookup table. It is added to the A / D converter 30 as a threshold level when the sensor detection signal of the code reading sensor 26 is A / D converted. In addition,
The look-up table stores an optimum threshold value (for binarizing the output signal of the dot code reading sensor) according to the signal (weighted average value) representing the optical distortion.

Therefore, the A / D converter 30 can be realized by a simple comparator. Further, since the circuit configuration is simplified by implementing the A / D conversion unit 30 with such a comparator, a plurality of dot code reading sensors 26 can be arranged on the same chip. As a result, a plurality of pixels can be processed at the same time, that is, in parallel, so that the total processing time for reading the entire dot code can be significantly reduced.

Here, the marker 38 in parallel processing is used.
The detection method of will be described. In this explanation, 8
The parallel processing of lines will be described as an example. When the dot data for 8 lines is viewed as 8-bit data as shown in FIG. 2B, the marker 32 is the portion where “1” is continuous as shown in FIG. 3A. I understand.

Therefore, it is understood that the center of the byte string having the maximum value in the portion where the "1" is continuous is the center of the marker 32 in the X-axis direction. Next, the Y-axis center starts from the center (between the 4th bit and the 5th bit) of the scan row where the value that has become the X-axis center is 255.
It can be obtained by changing the Y-axis center point as shown in FIG. 3B or 3C. That is,
The Y-axis center can be obtained by changing the center position of the scan row which is 255 based on the value indicating the X-axis center.

Next, a second embodiment of the present invention will be described. FIG. 4A is a diagram showing the configuration of the image pickup processing unit 18 in the second embodiment. In this embodiment, the dot code reading sensor sensor 21 and the optical distortion reading sensor 28 are arranged line by line. The signals of both sensors are read at the same time.

That is, as shown by a solid line and a broken line in the figure for simplification, the pixel line on one CMD is alternately used as the dot code reading sensor 21 and the optical distortion reading sensor 28. The pixel line includes, for example, 480 pixels. The dot code reading sensor sensor 21 and the optical distortion reading sensor 28 have different wavelength bands. For example, the dot code reading sensor sensor 21 detects the wavelength of visible light and is used for dot mark reading. Numeral 28 is for detecting the wavelength of ultraviolet light and is used for detecting the waviness and inclination of the paper. Actually, the dot code reading sensor 26 and the optical strain reading sensor 28 are the same, and the detection wavelength band is changed by an optical filter attached to the front surface of these sensors.

In such a configuration, as shown in FIG. 4B, the scan signal generator 3 of the logic circuit 32 is provided.
The analog signal from the dot code reading sensor 26 read by the scan signal from the A.D.
Is converted into digital image data and output to the image processing unit 20.

At this time, the sensor detection signals of the optical distortion reading sensor 28 output at the same time are only shifted by one line from the position of the pixel read from the dot code reading sensor 26, so that the dot code is almost the same. It can be represented as a distortion signal corresponding to the position of the read sensor 26. Therefore, the look-up table (distortion correction table) 4 for converting the sensor detection signal of the optical distortion reading sensor 28 into the correction signal of the conversion level of the A / D converter 30.
Through 0, the signal from the dot code reading sensor 26 in addition to the A / D conversion unit 30 is set to a threshold level for A / D conversion.

Therefore, the A / D converter 30 can be realized by a simple comparator. Further, since the circuit configuration is simplified by implementing the A / D conversion unit 30 with such a comparator, a plurality of dot code reading sensors 26 can be arranged on the same chip. As a result, a plurality of pixels can be processed at the same time, that is, in parallel, so that the total processing time for reading the entire dot code can be significantly reduced.

Next, a third embodiment of the present invention will be described. FIG. 5A is a diagram showing the configuration of the image pickup processing unit 18 in the third embodiment. In the present embodiment, the dot code reading sensor sensor 21 and the optical distortion reading sensor 28 are respectively arranged in the scanning direction. The signals are alternately arranged in the directions orthogonal to each other (that is, alternately arranged for each pixel in the scanning direction), and the signals of both sensors are simultaneously read.

That is, as shown by a solid line and a broken line in the figure for simplification, the pixels of the dot code reading sensor 21 and the optical distortion reading sensor 28 are alternately arranged for each pixel on one CMD. is there. That is, it is configured by rotating the same CMD as that of the second embodiment by 90 °.

Here, the dot code reading sensor sensor 2
1 and the optical strain reading sensor 28 have different wavelength bands. For example, the dot code reading sensor sensor 21 detects the wavelength of visible light and is used for reading dot marks, and the optical strain reading sensor 28 uses ultraviolet light. It detects the wavelength and is used to detect the waviness and inclination of the paper. Actually, the dot code reading sensor 26 and the optical strain reading sensor 28 are the same, and the detection wavelength band is changed by an optical filter attached to the front surface of these sensors.

In such a structure, as shown in FIG. 5B, the scan signal generator 3 of the logic circuit 32 is provided.
The analog signal from the dot code reading sensor 26 read by the scan signal from the A.D.
Is converted into digital image data and output to the image processing unit 20.

In the third embodiment, since the sensor detection signal of the dot code reading sensor 26 is read out in the direction orthogonal to the scanning direction, eight A / D converters 30 are used. A D converter or a comparator is included, and outputs of these eight A / D converters or comparators are collectively output as an 8-bit binarized dot code.

Here, the sensor detection signals of the optical distortion reading sensor 28, which are output at the same time, are shifted from the position of the pixel read from the dot code reading sensor 26 by one pixel in the scanning direction. It can be represented as a distortion signal substantially corresponding to the position of the dot code reading sensor 26. Therefore, the sensor detection signal of the optical distortion reading sensor 28 is added to the A / D conversion unit 30 through a look-up table (distortion correction table) 40 that converts the conversion level correction signal of the A / D conversion unit 30 into the dot. The threshold level for A / D conversion of the signal of the code reading sensor 26 is used.

Therefore, the A / D converter 30 can be realized by a simple comparator. Further, since the circuit configuration is simplified by implementing the A / D conversion unit 30 with such a comparator, a plurality of dot code reading sensors 26 can be arranged on the same chip. As a result, a plurality of pixels can be processed at the same time, that is, in parallel, so that the total processing time for reading the entire dot code can be significantly reduced.

Although the present invention has been described based on the above embodiments, the present invention is not limited to the above embodiments, and various modifications and applications are possible within the scope of the present invention. Here, the summary of the present invention is summarized as follows.

(1) Optically from an information recording medium having a portion in which multimedia information including at least one of audio information, video information and digital code data is recorded in an optically readable two-dimensional code pattern. Imaging means for reading the two-dimensional code pattern,
Information consisting of a restoring means for processing the two-dimensional code pattern read by the image pickup means to restore the original multimedia information, and an output means for reproducing and outputting each information based on the output signal from the restoring means. In the reproducing system, the image pickup means is arranged in the vicinity of the code reading sensor for optically reading the two-dimensional code pattern on the information recording medium, and detects optical distortion such as aberration. Optical strain reading sensor of
An information reproducing system comprising: a correction unit that corrects the sensor detection signal of the code reading sensor based on the sensor detection signal of the optical strain reading sensor.

With such a structure, the sensor detection signal of the code reading sensor accurately corresponds to the two-dimensional code pattern, and the original multimedia information can be accurately restored.

(2) The information reproducing system according to (1), wherein the code reading sensor and the optical strain reading sensor are formed on the same chip by a semiconductor manufacturing method. With such a configuration, the system can be downsized.

(3) The image pickup means further includes A / D conversion means for converting the sensor detection signal of the code reading sensor into a digital signal, and the correction means converts the sensor detection signal of the optical distortion reading sensor into a digital signal. Based on the above, based on the above, the A / D conversion means includes a control means for controlling a threshold level when the sensor detection signal of the code reading sensor is converted into a digital signal. system.

With this structure, the A / D
Since the conversion means can be realized by a simple comparator and the circuit configuration is simplified, it is possible to dispose a plurality of conversion means on the same chip as the code reading sensor.
As a result, a plurality of pixels can be processed at the same time, that is, in parallel, so that the total processing time for reading the entire two-dimensional code can be significantly reduced.

(4) A plurality of the optical strain reading sensors are arranged around the code reading sensor, and the control means weight averages the sensor detection signals of the plurality of optical strain reading sensors, and the weighted average thereof. The information reproducing system according to (3) above, further comprising means for controlling the threshold level based on a value.

With this structure, the system can be downsized. (5) The information reproducing system according to (3), wherein the optical distortion reading sensor and the code reading sensor are alternately arranged for each one pixel line.

With such a structure, the system can be downsized. (6) The optical strain reading sensor is arranged alternately with the code reading sensor in a direction orthogonal to the scanning direction, that is, is arranged alternately for each pixel in the scanning direction. The information reproducing system according to (3). With such a configuration, the system can be downsized.

[0061]

As described in detail above, according to the present invention,
It is possible to provide an information reproducing system that allows a sensor detection signal to accurately correspond to a two-dimensional code pattern and can process such a sensor detection signal at high speed.

[Brief description of drawings]

FIG. 1A is a diagram showing a configuration of a reading unit used in an information reproducing system of a first embodiment, and FIG. 1B is a diagram showing a configuration of an image pickup processing unit incorporated in the reading unit.

FIG. 2A is a block configuration diagram of an image pickup processing unit in the first embodiment, and FIG. 2B is a diagram showing a relationship between a marker and a scanning range.

FIG. 3A is a diagram showing a result obtained when 8-line dot data is viewed as 8-bit data for explaining a marker detection method in parallel processing; FIG. 6C is a diagram showing a conversion table of Y-axis center points.

4A and 4B are respectively a plan view and a block configuration diagram showing a configuration of an image pickup processing unit in the second embodiment.

5A and 5B are a plan view and a block configuration diagram showing a configuration of an image pickup processing unit in the third embodiment, respectively.

FIG. 6 is a diagram for explaining a dot code format.

FIG. 7 is a diagram showing a configuration of a conventional multimedia information reproducing apparatus.

[Explanation of symbols]

10 ... Reading unit, 12 ... Sheet, 14 ... First LED, 16
... 2nd LED, 18 ... Imaging processing part, 20 ... Image processing part,
22 ... Data processing unit, 24 ... Power supply unit, 26 ... Dot code reading sensor, 28 ... Optical distortion reading sensor, 30 ... A /
D conversion section, 32 ... Logic circuit, 34 ... Scan signal generator, 36 ... Weighted averaging section, 38 ... Marker, 40 ... Distortion correction table.

Claims (3)

[Claims] 1. An information recording medium optically comprising a portion in which multimedia information including at least one of audio information, video information and digital code data is recorded in an optically readable two-dimensional code pattern. Imaging means for reading the two-dimensional code pattern, restoring means for processing the two-dimensional code pattern read by the imaging means to restore the original multimedia information, and reproducing each information based on the output signal from the restoring means. In the information reproducing system including an output unit that outputs the code, the image capturing unit is arranged in the vicinity of the code reading sensor for optically reading the two-dimensional code pattern on the information recording medium. An optical strain reading sensor for detecting the optical strain, and a sensor detection of the optical strain reading sensor. Based on the signal, the information reproducing system characterized by comprising a correction means for correcting the sensor detection signal of the code reading sensor. 2. The information reproducing system according to claim 1, wherein the code reading sensor and the optical strain reading sensor are formed on the same chip by a semiconductor manufacturing method. 3. The image pickup means further includes A / D conversion means for converting the sensor detection signal of the code reading sensor into a digital signal, and the correction means is based on the sensor detection signal of the optical distortion reading sensor. 2. The information reproducing system according to claim 1, further comprising control means for controlling a threshold level when the sensor detection signal of the code reading sensor is converted into a digital signal in the A / D conversion means.