TW201429246A - VGA image extension transmission system with auto image regulation - Google Patents

Abstract

The VGA image extension transmission system of the present invention comprises: an image output source providing a first image signal; a testing circuit providing a testing signal; an image encoding/transmitting circuit forming transmission signals of the first image and testing signals through encoding technique; an image decoding/receiving circuit receiving the transmission signal and generating a second image and testing signals after decoding the transmission signal; an image comparison circuit receiving the second image and testing signals and generating an adjusting signal after examination and comparison; an image enhancement/compensation circuit automatically converting the second image signal to a third image signal after receiving the adjusting signal; and an image display apparatus receiving the second image signal and receiving the third image signal after adjustment. The present invention can improve the problems of the correction adjustment proceeded by the eyes of the technicians and reduce the human resource costs for image adjustment, and effectively avoid the situation of distortion happened after adjustment due to inexperience.

Description

Automatic image adjustment VGA image extension transmission system

The invention relates to a VGA image system transmitted by analog signal format, in particular to an image extension transmission system with a detection comparison circuit for automatically adjusting a VGA image.

At present, the general image transmission extension cable specifications are VGA, DVI or HDMI. Among them, VGA only transmits analog signals, DVI can transmit analog and digital signals, but neither can transmit sound, while HDMI can transmit digital signals. Different materials such as voice and network data.

The VGA extender commonly used in the market is transmitted by analog signal, and the signal will delay or weaken the signal according to the increase of the distance. Therefore, in the case of transmission over a long distance (above 40 meters), the remotely restored The VGA image signal will have the following distortion: 1. The restored image will be darker. 2. The restored image produces a blurred picture. 3. The RGB three colors on the image are not synchronized.

Please refer to FIG. 1 . Therefore, in a general long-distance VGA image transmission system, an image enhancement compensation circuit 22 must be disposed between the image output source 20 (such as a computer) and the image display device 21 (screen). The image signal can be transmitted to the image decoding receiving circuit 24 after the image encoding transmission circuit 23, and the image is enhanced by the image enhancement compensation circuit 22, and the technician must confirm the distortion state through the naked eye image display device 21, and The different phenomena of distortion are separately adjusted and compensated to different degrees, so that the compensated image can be closer to the original image quality on the image output source 20.

The lack of such an image enhancement compensation circuit is Manual adjustment, in this way, must be wasted manpower to adjust the image together with the electromechanical construction of the general building, which often causes difficulty in installing the transmission system and increase labor costs. In addition, when the technician installs the image system on site, the numerical value of the five image adjustment functions must be determined by the naked eye. Therefore, the technician who has to adjust the experience must adjust the image to the original image correctly. If the technician's experience is insufficient, it will still cause some distortion of the image display device's picture.

In view of the fact that there are still many deficiencies in construction and manpower considerations due to the traditional manual adjustment of VGA image extension, it is necessary to improve and design an innovative VGA image extension transmission system to improve the current lack.

The main purpose of the present invention is to provide a VGA image extension transmission system for automatically performing image adjustment, which is improved by the calibration of the human eye by the technician, thereby reducing the cost of image adjustment human resources and reducing the image display caused by insufficient experience of the technician. The device still appears to be a distorted image after adjustment.

The secondary purpose of the present invention is to add the image signal provided by the image output end to the test signal, so that the image signal which is distorted after long-distance transmission can be adjusted and restored through the test signal at the image receiving end, so that the image on the image display device is displayed. The picture shows the same level of detail as the original image.

To achieve the above objective, the VGA image extension transmission system of the automatic image adjustment of the present invention mainly comprises an image output source, a test circuit, an image code transmission circuit, an image decoding reception circuit, an image enhancement compensation circuit, and an image detection comparison. Circuit and an image display device.

The image output source provides a first image signal, and the first image signal has a plurality of visible regions arranged in a circular interval and an invisible region. The above test circuit mainly provides a test signal independently. The image encoding transmission circuit is electrically connected to the image output source and the test circuit, respectively, for receiving the first image signal and the test signal, and After the test signal is added to the invisible area, a transmission signal is generated by coding.

In addition, the image decoding receiving circuit is electrically connected to the image encoding transmission circuit for receiving the transmission signal and decoding to generate a second image signal and a test signal. The image enhancement compensation circuit is electrically connected to the image decoding receiving circuit to receive and transmit the second image signal and the test signal.

Furthermore, the image detection and comparison circuit is electrically connected to the image enhancement compensation circuit, receives the second image signal and the test signal, and compares the second image signal and the test signal to generate an adjustment signal. The image display device is electrically connected to the image enhancement compensation circuit to receive the second image signal; thus, the image enhancement compensation circuit of the present invention automatically adjusts the second image signal after receiving the adjustment signal. The third image signal; and the image display device starts to receive the third image signal after the image detection and comparison circuit is adjusted, and displays an image image by using the third image signal.

In a preferred embodiment, the image detection and comparison circuit of the present invention comprises an RGB time comparison circuit, a sharpness detection circuit and a brightness detection circuit; and the adjustment signal comprises an RGB compensation signal, a sharpness compensation signal and a gain. Compensation signal.

The RGB time comparison circuit is configured to detect a delay time between the three primary colors of RGB, and control the delay signals of the other two leading color primary colors based on the most retarded primary color primary colors until there is no delay time between the three primary colors of the colored light.

The sharpness detecting circuit is configured to detect the cutoff voltage result. If it is determined that the reduction is required, the sharpness compensation control signal is first set to a maximum value, and then the compensation signal is gradually decreased until the detection result is changed; but if the sharpness detecting circuit detects When it is judged that it needs to be increased, the compensation control signal of the sharpness is first used. Set to the minimum value, then gradually increase the compensation signal until the detection result changes.

The brightness detecting circuit is configured to detect a target voltage value. If the measured detecting voltage is less than the target value, the gain compensation signal is set to a minimum value, and then the compensation signal is gradually increased until the detection result is changed; but if the brightness detecting circuit is When the detection detection voltage is greater than the target value, the compensation signal of the gain is set to the maximum value, and then the compensation signal is gradually reduced until the detection result is changed.

In a possible embodiment, the image encoding transmission circuit and the image decoding receiving circuit are connected by a twisted wire, and the twisted wire is set as one of a CAT5 line, a CAT5E line, and a CAT6 line.

The invention is characterized in that an image detection and comparison circuit and an image enhancement compensation circuit automatically adjusted by the matching path are designed in the entire image extension transmission system, so that the image signal which is distorted by long-distance transmission can be provided through the test circuit in the output end. The test signal, the distortion image signal is adjusted and restored by itself, so that the traditional adjustment of the human eye must be performed by the technician, thereby reducing the human resource cost of the image adjustment, and reducing the image display device after the adjustment due to insufficient experience of the technician. It still happens when the image is distorted.

10‧‧‧Image output source

101‧‧‧ first image signal

102‧‧‧ visible area

103‧‧‧Invisible area

11‧‧‧Image display equipment

12‧‧‧Test circuit

121‧‧‧Test signal

13‧‧‧Image coding transmission circuit

131‧‧‧ transmission signal

14‧‧‧Image decoding receiving circuit

141‧‧‧Second image signal

15‧‧‧Image Enhancement Compensation Circuit

151‧‧‧ Third video signal

16‧‧‧Image detection comparison circuit

161‧‧‧Adjustment signal

162‧‧‧Time comparison circuit

163‧‧‧Sharpness detection circuit

164‧‧‧Brightness detection circuit

20‧‧‧Image output source

21‧‧‧Image display equipment

22‧‧‧Image Enhancement Compensation Circuit

23‧‧‧Image code transmission circuit

24‧‧‧Image decoding receiving circuit

1 is a conventional VGA image extension transmission system for manual image adjustment; FIG. 2 is a diagram of a VGA image extension transmission system for automatic image adjustment according to the present invention; FIG. 3 is a schematic diagram of a first image signal added to a test signal according to the present invention; 4 is a schematic diagram of an internal circuit module of the image detection and comparison circuit of the present invention; 5A-5D is a comparison diagram of detection delay time of the RGB time comparison circuit of the present invention; and FIG. 6 is a schematic diagram of a decrement compensation signal of the sharpness detection circuit of the present invention. Figure 7 is a schematic diagram of the incremental compensation signal of the sharpness detecting circuit of the present invention; Figure 8 is a schematic diagram of the incremental compensation signal of the brightness detecting circuit of the present invention.

For a better understanding and understanding of the structure, the use and the features of the present invention, the preferred embodiments will be described in detail with reference to the drawings as follows: Referring to FIG. 2, the present invention The automatic image adjustment VGA image extension transmission system is mainly used between a computer as the image output source 10 and a screen as the image display device 11, and the distance between the image output source 10 and the image display device 11 must be 50 Above the ruler, the VGA image automatically adjusts better.

As shown in the figure, in addition to the image output source 10 and the image display device 11, the VGA image extension transmission system of the present invention is further provided with a test circuit 12, an image coding transmission circuit 13, and a video decoding reception. The circuit 14, an image enhancement compensation circuit 15, and an image detection comparison circuit 16.

The image encoding and transmitting circuit 13 is electrically connected to the image output source 10 and the testing circuit 12; the image decoding receiving circuit 14 is electrically connected to the image encoding transmission circuit 13; the image enhancement compensation circuit 15 is electrically connected to the image. Decoding the receiving circuit 14 and the image display device 11; the image detecting and comparing circuit 16 is electrically connected to the image intensifying compensation circuit 15: the image decoding receiving circuit 14 and the image decoding receiving circuit 14 are connected by a twisted wire, which is feasible In the example, the above strand is set to one of a CAT5 line, a CAT5E line, and a CAT6 line.

As shown in FIG. 3, the image output source 10 provides a first image signal 101. The first image signal 101 has a plurality of visible regions 102 and an invisible region 103 arranged in a cyclic interval. The test circuit 12 provides a separate test. The image signal transmission circuit 13 receives the first image signal 101 and the test signal 121, and adds the test signal 121 to the invisible area 103, and then generates the code. A transmission signal 131.

The first image signal 101 is composed of voltage signals of R, G, B, Hsync, and Vsync, respectively, as shown in the figure, since the test signals 121 are invisible regions 103 respectively added to the R, G, and B voltage signals. Therefore, when the image display device 11 plays back the image, the viewer does not know that the image signal has the test signal 121.

In addition, the image decoding and receiving circuit 14 is configured to receive the transmission signal 131 and generate a second image signal 141 and a test signal 121 after being decoded. The image enhancement compensation circuit 15 directly receives and transmits the second image signal 141 and the test signal 121. The image detection and comparison circuit 16 is electrically connected to the image enhancement compensation circuit 15 to receive the second image signal 141 and the test signal 121, and compares the second image signal 141 and the test signal 121 to generate an adjustment signal. 161. The image display device 11 is electrically connected to the image enhancement compensation circuit 15 and receives the second image signal 141.

So that the image enhancement device 15 of the present invention automatically adjusts the second image signal 141 to generate a third image signal 151 after receiving the adjustment signal 161; and the image display device 11 will detect the comparison circuit. After the adjustment, the third image signal 151 is received, and an image image is displayed by the third image signal 151.

Referring to FIG. 4, in the preferred embodiment, the image detection and comparison circuit 16 of the present invention includes an RGB time comparison circuit 162, a sharpness detection circuit 163, and a brightness detection circuit 164. The adjustment signal 161 generated by the detection and comparison circuit 16 includes an RGB compensation signal, a sharpness compensation signal, and a gain compensation signal.

Referring to FIG. 5A, the RGB time comparison circuit 162 of the present invention detects the delay time between the three primary colors of RGB, and controls the delay signals of the other two leading color primary colors to be colored based on the most delayed color primary colors. There is no delay between the three primary colors.

Please refer to Figure 5B. When the B voltage signal leads the G voltage signal, it must control the delay signal of B. Please refer to Figure 5C. Conversely, when the R voltage signal leads the G voltage signal, it must control the delay signal of R. Please refer to Figure 5D. In addition, if the R voltage signal leads the B voltage signal, it must control the delay signal of R.

Referring to FIG. 6 , the sharpness detecting circuit 163 of the present invention is configured to detect a cutoff voltage result, thereby confirming a sharpness adjustment manner, wherein when the transmission distance is a long distance, if it is determined that the reduction is required, the sharpness is first The compensation control signal of the degree is set to the maximum value, and then the compensation signal is gradually decremented until the detection result is changed. As shown in the figure, after the result of the restored detection signal has to be changed from 1 to 0, the compensation control signal for reducing the sharpness is stopped.

Please refer to FIG. 7 , but if the above-mentioned sharpness detecting circuit 163 detects that the need is increased, the sharpness compensation control signal is first set to a minimum value, and then the compensation signal is gradually incremented until the detection result is changed. As shown in the figure, after the restored detection signal result has to be changed from 0 to 1, the compensation control signal for increasing the sharpness is stopped.

Referring to FIG. 8, the brightness detecting circuit 164 of the present invention is configured to detect a target voltage value. If the measured detecting voltage is less than the target value, the gain compensation signal is set to a minimum value, and then the compensation signal is gradually increased until the detection is performed. The voltage equals the ideal target voltage and stops the compensation control signal that increases the gain.

Vice versa, if the detection voltage is greater than the target value, the brightness detection circuit 164 sets the compensation signal of the gain to the maximum value, and then gradually reduces the compensation signal until the detection voltage is equal to the ideal target voltage, and stops the compensation of the reduction gain. Control signal.

In summary, the present invention adds a test signal to the output end, and cooperates with the design of an image detection and comparison circuit and an image enhancement compensation circuit to allow the image signal that is distorted after long-distance transmission to be automatically transmitted through the test signal at the receiving end. Adjusting and restoring, improving the tradition must be seen by the technicians Correction of the proofreading, thereby reducing the cost of image adjustment human resources, and reducing the situation that the image display device is still distorted after adjustment due to insufficient experience of the technician.

The above embodiments are intended to be illustrative only, and are not intended to limit the scope of the present invention. It is included in the scope of the following patent application.

10‧‧‧Image output source

101‧‧‧ first image signal

11‧‧‧Image display equipment

12‧‧‧Test circuit

121‧‧‧Test signal

13‧‧‧Image coding transmission circuit

131‧‧‧ transmission signal

14‧‧‧Image decoding receiving circuit

141‧‧‧Second image signal

15‧‧‧Image Enhancement Compensation Circuit

151‧‧‧ Third video signal

16‧‧‧Image detection comparison circuit

161‧‧‧Adjustment signal

Claims (9)

An automatic image adjustment VGA image extension transmission system includes: an image output source providing a first image signal; a test circuit providing a test signal; an image encoding transmission circuit electrically connected to the image output source and the above The test circuit receives the first image signal and the test signal, and generates a transmission signal by encoding; an image decoding receiving circuit is electrically connected to the image encoding transmission circuit, receives the transmission signal, and generates a first An image enhancement compensation circuit is electrically connected to the image decoding receiving circuit to receive and transmit the second image signal and the test signal; an image detection and comparison circuit electrically connected to the image enhancement compensation circuit Receiving the second image signal and the test signal, and comparing the second image signal and the test signal to generate an adjustment signal; and an image display device electrically connected to the image enhancement compensation circuit to receive the second image Signal; wherein the above image enhancement After receiving the adjustment signal, the compensation circuit automatically adjusts the second image signal to generate a third image signal; and the image display device starts to receive the third image signal after the image detection and comparison circuit is adjusted, and the The three video signals display an image. According to the automatic image adjustment VGA image extension transmission system of claim 1, wherein the image detection and comparison circuit comprises an RGB time comparison circuit, a sharpness detection circuit and a brightness detection circuit. According to the automatic image adjustment VGA image extension transmission system of claim 2, wherein the RGB time comparison circuit detects the delay time between the three primary colors of RGB, and controls the addition of the other two leading color lights based on the most delayed color primary color. The delay signal of the primary color until there is no delay between the three primary colors of the color. According to the automatic image adjustment VGA image extension transmission system of claim 2, wherein the sharpness detection circuit firstly sets the sharpness compensation control signal to a maximum value if the detection needs to be reduced, and then gradually decrements the compensation signal until The detection result changes; but if the above-mentioned sharpness detection circuit detects that the need to increase, the sharpness compensation control signal is first set to a minimum value, and then the compensation signal is gradually incremented until the detection result changes. According to the automatic image adjustment VGA image extension transmission system of claim 2, wherein the brightness detection circuit sets the compensation signal of the gain to a minimum value when the detection detection voltage is less than the target value, and then gradually increases the compensation signal until The detection result changes; but if the brightness detection circuit measures the detection voltage greater than the target value, the gain compensation signal is set to the maximum value, and then the compensation signal is gradually reduced until the detection result changes. According to the automatic image adjustment VGA image extension transmission system of claim 2, wherein the adjustment signal comprises an RGB compensation signal, a sharpness compensation signal and a gain compensation signal. The VGA image extension transmission system of the automatic image adjustment according to the first aspect of the patent application, wherein the first image signal has a plurality of visible regions and invisible regions arranged in a cyclic interval, and the image encoding transmission circuit adds the test signal In the invisible area of the first image signal. VGA image extension for automatic image adjustment according to item 1 of the patent application scope The transmission system, wherein the image encoding transmission circuit and the image decoding receiving circuit are connected by a twisted wire. The VGA image extension transmission system according to the automatic image adjustment of claim 8 of the patent application, wherein the stranded wire is set to one of a CAT5 line, a CAT5E line, and a CAT6 line.