TWI423077B - Optical receiving apparatus, methods for improving uniformity of receive image and determining tilt of an optical receiving apparatus and controlling cursor - Google Patents

Description

Pen type optical device, improved image uniformity and index control method

The present invention relates to an application technique of a pen type optical input device, and more particularly to a method for judging light pen tilt, improving image uniformity, and index control.

With the advancement of technology, identification (ID) technology is also getting more and more advanced. The identification code mainly utilizes the difference between the objects, and the computer automatically extracts the features or built-in data of the object, converts it into digital information that can be stored by the computer system, and compares the data or manages the data through the computer system to achieve identification and The purpose of management. Identification code technology includes Barcode, Magstripe, Optical Character Recognition (OCR), Biometric Recognition, Smartcard, and Radio Frequency Identification (RFID). . Its use is very wide, such as checkout, credit card, fingerprint identification, telephone IC card and MRT leisure card.

Optical Identification (OID) is a technology that hides digital data and captures hidden digital data in general prints. It can hide digital data in general prints through standard printing programs and standard inks. Through the optical and image processing technology of the optical identification pen (OID Pen), the data hidden in the printed matter can be taken out.

Fig. 1 is a structural view of a conventional optical identification pen. Please refer to Figure 1, The optical stylus includes a housing 101, a surface-type photosensitive element 102, a control circuit 103, an interface circuit 104, and a light-emitting element 105. The interface circuit 104 is, for example, a USB interface circuit, which is mainly used to connect a computer as a conversion of a communication protocol. The control circuit 103 is for controlling the surface-type photosensitive element 102 and the light-emitting element 105.

However, when a user uses a pen-type device, it is customary to tilt it at an angle. Thus, the image received by the surface-type photosensitive element 102 of the optical identification pen will have uneven brightness. Fig. 2 is a schematic view showing an image received by the surface-type photosensitive element 102 when the optical recognition pen is held by the right hand at an inclination angle of about 40 degrees. Referring to FIG. 2, the optical identification pen that relies on the single illumination source 105 may have a vignetting or shadow due to the tilt of the pen. This phenomenon of uneven brightness will have a great influence on the recognition rate of optical recognition.

In view of the above, it is an object of the present invention to provide an improved image uniformity for improving the uneven brightness distribution of images received by a pen-type optical input device.

Another object of the present invention is to provide a method for determining the tilt of a light pen and an index control method for determining the direction or angle of tilting of the pen type optical input device according to the brightness distribution of the image received by the pen type optical input device, and further determining The direction of movement and the speed of movement of the index (Cursor) of the computing device are operated.

To achieve the above or other objects, the present invention provides a method for improving image uniformity, which is suitable for an image received by a one-piece optical input device. The method comprises the steps of: providing a plurality of illumination sources in an image receiving window of the pen-type optical input device; dividing the surface-type photosensitive elements in the pen-type optical input device into a plurality of blocks; detecting each block sensing The brightness of the light-emitting elements adjacent to the particular block is adjusted when the brightness value of a particular block differs from the brightness value of a central block by a predetermined brightness value.

The present invention further provides an indicator control method, which is suitable for controlling a control unit to display a display indicator on a display, wherein the calculation device is coupled to a one-piece optical input device, the method comprising: the pen type optical input device The image receiving window provides at least one light source; the one-side photosensitive element in the pen type optical input device is divided into a plurality of blocks; the brightness sensed by each block is detected; according to the brightness of each block Determining the tilt direction and the tilt angle of the light pen according to the difference between the value and the brightness value of a central block; determining the moving direction of the index according to the tilt direction of the light pen; and determining the moving speed of the index according to the tilt angle of the light pen .

The present invention further provides a pen-type optical input device adapted to receive an image, the device comprising a one-piece housing, a one-sided photosensitive element, a plurality of light-emitting elements, and a control circuit. The pen-type housing has an optical receiving window. The surface type photosensitive element is disposed in the pen type housing, and the optical receiving surface faces the optical receiving window, wherein the surface type photosensitive element is divided into a plurality of blocks, and the surface type photosensitive element is used for detecting each of the The brightness sensed by these blocks. The plurality of light emitting elements are disposed between the optical receiving window and the surface sensitive element. A control circuit is used to control the light emitting elements and the surface sensitive element. In some blocks, the brightness value of one of the specific blocks is The luminance values of a central block differ by a predetermined luminance value, and the control circuit adjusts the luminance of the light-emitting elements adjacent to the particular block.

The spirit of the present invention is to divide the surface type photosensitive element in the pen type optical input device into a plurality of blocks, so that when the pen type optical input device is tilted, the difference in brightness between each block and the central block can be utilized. Determine the dark corner shadow of the image to determine the tilt direction and angle of the light pen. Then, in the image receiving window of the pen type optical input device, a plurality of light sources are arranged, so that the intensity of the plurality of light sources can be separately controlled to obtain a uniform brightness image. In this way, the readability of the image can be increased, and the subsequent application of the image is more favorable. In addition, this method can determine the tilt direction of the light pen, and is accordingly applied to the index or cursor control of the computing device.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

FIG. 3 is a device diagram of a pen-type optical input device according to an embodiment of the invention. Referring to Figure 3, the most common application for this pen-type optical input device is the optical identification pen. The pen-type optical input device includes a one-piece housing 301 having a surface-type photosensitive element 302, light-emitting elements 303, 304, and a control circuit 305. The photosensitive surface of the face-type photosensitive member 302 faces the optical receiving window 306 of the pen-shaped housing 301. The control circuit 305 is used to control the light-emitting elements 303, 304 and the surface-type photosensitive element 302. In addition, due to the limitation of drawing, only two light-emitting elements 303, 304 are shown in this figure, and the actual application is not limited to only two hairs. Optical component. These will be explained in the following examples.

FIG. 4 is a flow chart of a method for improving image uniformity applied to the above pen type optical input device according to an embodiment of the invention. Please refer to Figure 4, this method includes the following steps:

Step S401: Start.

Step S402: dividing the surface type photosensitive element in the pen type optical input device into a plurality of blocks. Referring to Fig. 5, Fig. 5 is a sectional view showing the surface type photosensitive element of Fig. 3 of the embodiment of the present invention. In this example, the planar photosensitive element is divided into nine blocks 501 to 509 and arranged in a nine-square shape. In other words, there can be a light-dark ratio relationship of eight directions D501~D508. Further, the "area type photosensitive element divided into a plurality of blocks" in this embodiment is not limited to the division of the entities, but may be divided or classified into a plurality of blocks by using the software.

Step S403: Detect the brightness sensed by each block. In order to simplify the detection of brightness, in general, the average value of the brightness of the entire block is used to represent the brightness value of the block.

Step S404: Compare whether the brightness difference value of each block and the central block is greater than a certain brightness value.

Step S405: When the brightness difference of one of the blocks is greater than the predetermined brightness value, the brightness of the light-emitting elements adjacent to the specific block is adjusted. Therefore, in this embodiment, ideally, there should be eight light-emitting elements corresponding to eight blocks 501-508 in eight directions D501 to D508. In addition, the following steps S401 to S405 and the operations performed by the same can be performed by the control circuit 305. In general, the tilt of the pen-type optical input device will only result in one block being the darkest and the other opposite. The blocks are the brightest. For example, when the block 501 is the brightest block, the block 505 is the darkest block. Therefore, the control circuit 305 can follow the steps, and has the following control modes: 1. The brightness of the light-emitting elements corresponding to the block 501 is dimmed; 2. the brightness of the light-emitting elements corresponding to the block 501 is dimmed, and the brightness of the light-emitting elements corresponding to the block 505 is brightened; and 3. only the block is The brightness of the light-emitting element corresponding to 505 is brightened.

These three control methods are the designer's selective design. The present invention is not limited to these three modes. Further, in the embodiment of Fig. 5 described above, although the surface-type photosensitive element 302 is divided into nine blocks, those skilled in the art should know that dividing into nine blocks is only one embodiment, and is divided into N x N blocks can also be implemented. Further, even if it is not divided into N × N blocks, it can be divided, for example, by the pattern of Fig. 6, and Fig. 6 is another sectional view of the surface type photosensitive element 302 of Fig. 3 of the embodiment of the present invention. Referring to Fig. 6, the surface type photosensitive element 302 is divided into 17 blocks 601 to 617 in total. The areas of blocks 601-616 are the same, and the area of central block 617 is twice the area of blocks 601-616.

Step S406: End.

Next, the present invention further proposes an index control method for controlling the calculation means of a computing device such as a personal computer or a notebook computer by utilizing the drawbacks of the above-mentioned prior art. FIG. 7 is a flow chart of an index control method applied to a pen type optical input device according to an embodiment of the invention. Please refer to FIG. 7. In this example, the pen-type optical input device does not necessarily need to be the pen-type optical transmission of FIG. 3 of the embodiment of the present invention. As the device, a pen-type optical input device of the prior art can also be used. Before describing the method, it is assumed that the pen-type optical input device is coupled to a personal computer through a computer interface and is used to control a mouse pointer. The control method of the indicator includes the following steps:

Step S701: Start.

Step S702: dividing the one-sided photosensitive element in the pen type optical input device into a plurality of blocks. For example, the nine squares in Figure 5 or the 17 blocks in Figure 6 are acceptable.

Step S703: Detect the brightness sensed by each block. Similarly, in order to simplify the operation, in general, the average value of the brightness of the entire block is used to represent the brightness value of the block.

Step S704: Determine the tilt direction and the tilt angle of the pen type optical input device according to the difference between the brightness value of each block and the brightness value of a central block. By the same token, the tilt of the pen-type optical input device will only result in one block being the darkest and the other opposite block being the brightest. This is an important reference indicator for judging the direction of the tilt. Next, the brightness difference value between the brightest block and the central block and the brightness difference value between the darkest block and the central block are important reference indicators for judging the tilt angle. The relationship between the difference in brightness and the tilt angle can be implemented by experimenting with a lookup table or by other algorithms. It will not be discussed here.

Step S705: Determine the moving direction of the index according to the tilt direction of the pen type optical input device.

Step S706: determining the moving speed of the index according to the magnitude of the tilt angle of the pen type optical input device.

Step S707: End.

Although the above embodiment proposes an index control method, the above steps S701 to S704 can be regarded as a method of determining the tilt of the pen type optical input device. Its application does not have to be limited to the control of the indicator. It can also be applied, for example, to: 1. Correction of received images; or 2. Applied to computer graphics, the tilt of the pen-type optical input device can also define the thickness of the tip of the computer drawing.

In summary, the spirit of the present invention is to divide the surface type photosensitive element in the pen type optical input device into a plurality of blocks, so that when the pen type optical input device is tilted, each block and the center can be utilized. The difference in brightness of the block determines the dark corner shadow of the image to determine the tilt direction and angle of the light pen. Then, in the image receiving window of the pen type optical input device, a plurality of light sources are arranged, so that the intensity of the plurality of light sources can be separately controlled to obtain a uniform brightness image. In this way, the readability of the image can be increased, and the subsequent application of the image is more favorable. In addition, this method can determine the tilt direction of the light pen, and is accordingly applied to the index or cursor control of the computing device.

The specific embodiments of the present invention are intended to be illustrative only and not to limit the invention to the above embodiments, without departing from the spirit of the invention and the following claims. The scope of the invention and the various changes made are within the scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

101‧‧‧ Shell

102, 302‧‧‧ Face type photosensitive element

103, 305‧‧‧ control circuit

104‧‧‧Interface circuit

105‧‧‧Lighting elements

301‧‧‧ pen case

303, 304‧‧‧Lighting elements

306‧‧‧Optical Receiving Window

S401~S406‧‧‧Method for improving image uniformity according to embodiments of the present invention A step of

501~509‧‧‧9 blocks in which the surface photosensitive element 302 is divided into

Eight directions represented by blocks 501~508 in D501~D508‧‧‧

601~617‧‧‧17 blocks in which the surface photosensitive element 302 is divided into

S701~S707‧‧‧ steps of the index control method of the embodiment of the present invention

Fig. 1 is a structural view of a conventional optical identification pen.

Fig. 2 is a schematic view showing an image received by the surface-type photosensitive element 102 when the optical recognition pen is held by the right hand at an inclination angle of about 40 degrees.

FIG. 3 is a device diagram of a pen-type optical input device according to an embodiment of the invention.

FIG. 4 is a flow chart of a method for improving image uniformity applied to the above pen type optical input device according to an embodiment of the invention.

Fig. 5 is a sectional view showing a surface type photosensitive element 302 of Fig. 3 of the embodiment of the invention.

Fig. 6 is another sectional view of the surface type photosensitive element 302 of Fig. 3 of the embodiment of the present invention.

FIG. 7 is a flow chart of an index control method applied to a pen type optical input device according to an embodiment of the invention.

301‧‧‧ pen case

302‧‧‧ Face type photosensitive element

303, 304‧‧‧Lighting elements

305‧‧‧Control circuit

306‧‧‧Optical Receiving Window

Claims (8)

A method for improving image uniformity, which is suitable for an image received by a one-piece optical input device, the method comprising: providing a plurality of illumination sources in an image receiving window of the pen-type optical input device; and the pen-type optical input device The inner photosensitive element is divided into a plurality of blocks; detecting the brightness sensed by each of the blocks; and, when the brightness of a specific block and the brightness of a central block in the blocks The values differ by a predetermined brightness value, and the brightness of the light-emitting elements adjacent to the particular block is adjusted, wherein the face-type photosensitive element is divided into N×N blocks, where N is an odd number and N is greater than 1, when In the block, wherein the brightness value of a specific block differs from the brightness value of a central block by a predetermined brightness value, the control circuit adjusts the brightness of the light-emitting element adjacent to the specific block, and the control flow of the control circuit includes The control circuit uses the difference between the brightness value of the central block and the brightness values of the remaining blocks to find a brighter direction and a darker direction; and the control circuit controls the light in the darker direction The brightness of the source is increased, and the brightness of the light source in the brighter direction is controlled to decrease such that the difference between the brightness value of each of the blocks and the brightness value of the central block is within the predetermined brightness value. A method for judging the tilt of a light pen, suitable for a one-piece optical transmission Into the device, the method comprises: providing at least one light source in the image receiving window of the pen type optical input device; dividing the one side type photosensitive element in the pen type optical input device into a plurality of blocks; detecting each of the The brightness sensed by the blocks; and the tilt direction of the pen type optical input device is determined according to the difference between the brightness value of each of the blocks and the brightness value of a central block. The method for determining the tilt of a light pen as recited in claim 2, wherein the surface type photosensitive element is divided into N×N blocks, wherein N is an odd number, and N is greater than 1, “according to each of the areas The difference between the brightness value of the block and the brightness value of a central block, determining the tilt direction of the pen-type optical input device" includes: comparing the brightness values of the central block with the brightness values of the remaining blocks, Finding a brightest block; and determining a tilting direction and a tilting angle of the pen-type optical input device according to a brightness difference value between the brightest block and the central block. The method for determining the tilt of a light pen as recited in claim 2, wherein the surface type photosensitive element is divided into N×N blocks, wherein N is an odd number, and N is greater than 1, “according to each of the areas The difference between the brightness value of the block and the brightness value of a central block, and determining the tilt direction of the pen-type optical input device includes: using the brightness value of the central block and the brightness values of the remaining blocks Comparing, finding a darkest block; and determining a tilting direction and a tilting angle of the pen-type optical input device according to a brightness difference value between the darkest block and the central block. An index control method is suitable for controlling a control unit to display an indicator displayed on a display, wherein the computing device is coupled to a one-piece optical input device, the method comprising: an image receiving window of the pen-type optical input device Providing at least one illumination source; dividing the one-sided photosensitive element in the pen-type optical input device into a plurality of blocks; detecting the brightness sensed by each of the blocks; according to the brightness of each of the blocks Determining the tilt direction and the tilt angle of the pen type optical input device according to the difference between the value and the brightness value of a central block; determining the moving direction of the index according to the tilt direction of the pen type optical input device; and according to the pen type optical The magnitude of the tilt angle of the input device determines the speed at which the index moves. The index control method as recited in claim 5, wherein the surface-type photosensitive element is divided into N×N blocks, wherein N is an odd number, and N is greater than 1, “according to each of the blocks The step of determining the tilt direction and the tilt angle of the pen type optical input device by the difference between the brightness value and the brightness value of a central block includes: Using the brightness value of the central block, comparing with the brightness values of the remaining blocks to find a brightest block; and determining the pen type according to the brightness difference value between the brightest block and the central block The tilt direction and tilt angle of the optical input device. The index control method as recited in claim 5, wherein the surface-type photosensitive element is divided into N×N blocks, wherein N is an odd number, and N is greater than 1, “according to each of the blocks The difference between the brightness value and the brightness value of a central block, determining the tilt direction and the tilt angle of the pen type optical input device includes: comparing the brightness values of the central block with the brightness values of the remaining blocks Finding a darkest block; and determining a tilt direction and a tilt angle of the pen type optical input device according to a brightness difference value between the darkest block and the central block. A pen-type optical input device is adapted to receive an image, the device comprising: a one-piece housing having an optical receiving window; a one-side photosensitive element disposed in the pen-shaped housing, the optical receiving surface facing the optical receiving window The surface type photosensitive element is divided into a plurality of blocks, and the surface type photosensitive element is configured to detect the brightness sensed by each of the blocks; the plurality of light emitting elements are disposed in the optical receiving window and the Between the surface-type photosensitive elements; and a control circuit for controlling the light-emitting elements and the surface-sensitive An element, wherein, in the blocks, a brightness value of a specific block differs from a brightness value of a central block by a predetermined brightness value, the control circuit adjusts a brightness of the light emitting element adjacent to the specific block, wherein the brightness The surface-type photosensitive element is divided into N×N blocks, wherein N is an odd number, and N is greater than 1, when the brightness value of one of the specific blocks is different from the brightness value of a central block. a brightness value, the control circuit adjusts the brightness of the light-emitting element adjacent to the specific block, and the control flow of the control circuit includes: the control circuit uses the brightness value of the central block, and the brightness values of the remaining blocks a difference value, finding a brighter direction and a darker direction; and the control circuit controlling the brightness of the light source in the darker direction to increase, and controlling the brightness of the light source in the brighter direction to decrease, so that each of the blocks The difference between the brightness value and the brightness value of the central block is within the predetermined brightness value.