KR101271660B1 - Error detection method of image data for camera test system by using error correction and crc codes - Google Patents

Abstract

PURPOSE: An error detection method of image transmission data which utilizes an error detection code of a camera inspection system is provided to install a CSI(Camera Serial Interface) conversion unit in a frame grabber, thereby distinguishing an error of an image data transmission process between frame grabbers from an MIPI(Mobile Industry Processor Interface) board. CONSTITUTION: A camera inspection system(100) changes serial packets, which are received from an external interface, into bytes and transmits the same to a first CSI-2 conversion unit(130) installed in an MIPI board(110). The camera inspection system transmits data, which is merged in a lane management layer of the first CSI-2 conversion unit, to a frame grabber(150). The camera inspection system converts the data by a second CSI-2 conversion unit(160) and detects errors from the data. [Reference numerals] (101) Camera; (130) First CSI-2 conversion unit; (131) Lane management layer; (132) Low level protocol layer; (133) Packet format layer; (140) First error detection unit; (160) Second CSI-2 conversion unit; (170) Second error detection unit; (180) Framer; (190) DMA controller

Description

ERROR DETECTION METHOD OF IMAGE DATA FOR CAMERA TEST SYSTEM BY USING ERROR CORRECTION AND CRC CODES}

The present invention relates to a method for checking an error of image transmission data received from a camera using an error detection code, and a frame grabber or a MIPI interface board applied thereto.

The development of wireless communication technology and the convergence of various functions centering on multimedia require high functionality and advanced terminal in a short time. Image sensors or packaged camera modules have become one of the main components of increasingly sophisticated mobile communication terminals.

Nevertheless, the evolution of wireless communications and convergence technologies also entails realistic constraints such as increased power consumption, complexity (maintaining compatibility with standards), and size (area of components). The MIPI (Mobile Industry Processor Interface), which was established in 2004 to address the non-scalability, footprint, and power consumption of traditional parallel interfaces, discussed the overall platform of mobile terminals, including cameras and displays. Introduced in version 1.0 in 2005, the Camera Serial Interface 2 (CSI-2) specification provides a data transfer and control interface between the camera device and the host processor. MIPI D-PHY, released in 2007, is a physical layer for various protocol standard layers provided by MIPI such as Display Serial Interface (DSI) and UniPro (Unified Protocol). CSI-2 also uses the D-PHY standard specification. . The CSI-2 and D-PHY interfaces use a unidirectional differential voltage signal (LVDS) for clock and data transmission. In general, one data lane is supported and two, three, or four multilanes can be used if high clock frequencies are to be avoided, resulting in nearly linearly increasing bandwidth. These CSI-2 and D-PHY specifications are a serial interface standard between camera sensors and host processors that aim to simplify handset configuration with low power, high speed, low cost and scalability, low EMI, and significant reduction in signal lines.

For camera sensor inspection using single or two lanes, specialized commercial chips have been used. However, for cameras using four multi lanes, it is difficult to meet the inspection speed requirements by conventional inspection methods, and a frame grabber for transmitting MIPI interface boards and image data need to be designed accordingly. have. In addition, since the CSI-2 receiver is provided in the MIPI interface board, the existing method has a limitation that an error may not be confirmed in the process of transmitting data from the MIPI interface board to the frame grabber.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object thereof is to provide an error detection method capable of easily performing error detection of image transmission data having multiple lanes.

Another object of the present invention is to enable error detection of image transmission data even in a frame grabber by utilizing an error detection code.

It is still another object of the present invention to provide an error detection method of image transmission data using an error detection code of a camera inspection system that can also inspect an existing parallel camera using a CSI-2 packet.

In order to solve the above problems, the error detection method of the image transmission data using the error detection code of the camera inspection system according to the present invention, by converting the serial packet received from the external interface into a byte by MIPI (Mobile Industry Processor Interface) board Transmitting to a first CSI-2 (Camera Serial Interface-2) converting unit installed at the CSI-2; Transmitting data merged by a lane management layer in the first CSI-2 converter to a frame grabber; And converting data transmitted from the lane management layer by a second CSI-2 converter installed in the frame grabber, and detecting an error from the converted data.

As an example related to the present invention, the first CSI-2 converter includes a first low level protocol layer and a first packet format layer, wherein the error detection method includes: The method may further include detecting an error after the combined data in the lane management layer of the first CSI-2 converter is sequentially converted through the first lower level protocol layer and the first packet format layer. In this case, the error detection method may further include comparing an error detected by the first CSI-2 converter and an error detected by the second CSI-2 converter.

As an example related to the present invention, the second CSI-2 conversion unit includes a second lower level protocol layer and a second packet format layer, and installs data transmitted from the lane management layer of the CSI-2 in the frame grabber. The converting by the second CSI-2 converter and detecting an error from the converted data include: transmitting data transmitted from the lane management layer of the CSI-2 to the second lower level protocol layer and the second packet format layer. It may include the step of performing the conversion after sequentially detecting the error.

As an example related to the present invention, the serial packet may be configured to be received over four lanes.

As an example related to the present invention, the error detection method may include converting a parallel packet received from an external interface of the MIPI board into a serial packet; And transmitting the serial packet to the frame grabber.

An error detection method of image transmission data using an error detection code of a camera inspection system according to the present invention includes converting a parallel packet received from an external interface of a MIPI board into a serial packet; Sending the serial packet to a frame grabber; And converting the serial packet by a CSI-2 converter installed in the frame grabber and detecting an error from the converted data.

An error detection apparatus for image transmission data utilizing an error detection code of a camera inspection system according to the present invention includes a physical layer (D-PHY) circuit unit for byte-forming a serial packet received from an external interface of a MIPI board; A first CSI conversion unit installed on the MIPI board and including a lane management layer for adding the output signals of the D-PHY circuit unit to a frame grabber; A second CSI converter installed in the frame grabber and converting data transmitted from the lane management layer into image data; And a first error detector installed in the frame grabber and detecting an error of data from the second CSI converter.

As an example related to the present disclosure, the error detecting apparatus may further include a second error detecting unit installed in the MIPI board and detecting an error of data from the first CSI converter.

As an example related to the present invention, the first CSI-2 converter may include a first low level protocol layer and a first packet format layer.

As an example related to the present invention, the second CSI-2 converter may include a second low level protocol layer and a second packet format layer.

As an example related to the present invention, the error detection apparatus may further include a packet conversion module installed in the MIPI board and converting a parallel packet received from the external interface into a serial packet.

In addition, an error detection apparatus for image transmission data utilizing an error detection code of a camera inspection system according to the present invention includes: a packet conversion module for converting parallel packets received from an external interface of a MIPI board into serial packets; A D-PHY circuit unit installed in a frame grabber and configured to byte the data transmitted from the packet conversion module; A CSI conversion unit including a low level protocol layer and a packet format layer for converting the output signal of the D-PHY circuit unit into image data; And an error detection unit for detecting an error of data from the CSI conversion unit.

The frame grabber according to the present invention comprises: a CSI conversion unit including a lower level protocol layer and a packet format layer for converting data transmitted from a MIPI board into image data; A framer for dividing the image data of the CSI conversion unit by frame unit; A DMA controller for transferring a frame defined by the framer to a memory; And an error detection unit for detecting an error of data from the CSI conversion unit.

MIPI board related to the present invention, the external interface for receiving a serial packet; A physical layer (D-PHY) circuit unit for byte-forming a serial packet received from the external interface; And a lane management layer having a transmitter for combining the output signals of the D-PHY circuit unit and transmitting the summed signal to a frame grabber. And an error detection unit for detecting an error of data from the CSI conversion unit.

According to the present invention, the error detection method of the image transmission data using the error detection code of the camera inspection system related to the present invention, and the error detection apparatus, the CSI conversion unit is installed in the frame grabber, so the transmission between the frame grabber from the MIPI board It is possible to discriminate errors in the process, and the reliability and accuracy of error checking are greatly improved.

In addition, according to an example related to the present invention, by providing a packet conversion module for converting parallel packets on a MIPI board, the inspection function of a camera having a parallel data structure may also be provided, thereby improving its utility.

1 is a block diagram illustrating an error detection method of image transmission data using an error detection code of a camera inspection system as an example related to the present invention.
2 is a block diagram illustrating an error detection method of image transmission data using an error detection code of a camera inspection system as another example related to the present invention.

Hereinafter, an error detection method and an error detection apparatus for image transmission data using an error detection code of a camera inspection system according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating an error detection method of image transmission data using an error detection code of a camera inspection system as an example related to the present invention.

In the error detection method according to the present invention, a serial packet received from an external interface is converted into bytes and transmitted to a first CSI-2 (Camera Serial Interface-2) conversion unit installed on a MIPI board, and the first CSI is transmitted. -2 transfers the combined data from the lane management layer in the lane management layer to the frame grabber, converts the data transmitted from the lane management layer by the second CSI-2 conversion unit installed in the frame grabber, And to detect an error from the converted data.

The error detection apparatus 100 of the image transmission data will be described based on the relationship between the MIPI board 110 and the frame grabber 150.

The MIPI board 110 is a device connected to the inspection jig of the camera 101 to be inspected. The MIPI board 110 includes a D-PHY 120, a first CSI-2 converter 130, and a first error detector. 140 is provided.

The D-PHY 120 byte-transmits the serial packet of the MIPI camera 101 received from the external interface and transmits it to the first CSI-2 converter 130. In case of supporting multi-lane, each lane has independent D-PHY (Physical Layer) logic and circuit, and the transmitting end distributes packets to each lane, and the receiving end collects the data received in each lane and Combine again to reconstruct the complete packet. The error detection apparatus 100 of this example generates a byte clock by synchronizing clocks received from a clock lane by a synchronization code detected through four multi lanes.

The D-PHY and CSI-2 interfaces use a unidirectional differential voltage signal (LVDS) for clock and data transmission. The clock and data are transmitted to LVDS in HS mode (High speed mode) using two signal lines. After transmitting one packet, the transmission lane is maintained in LP power mode.

The first CSI-2 converter 130 includes a lane management layer 131, a low level protocol layer 132, and a packet format layer 133.

The lane management layer 131 may have a buffer for each lane in order to support the multi-lane. The rain management layer 131 switches 8-bit data transmitted from a core, which is an upper layer, and stores the 8-bit data in a buffer in order, and the stored data is transmitted by each physical layer.

The combined data in the rain management layer 131 can be transmitted directly to the frame grabber 150. To this end, the rain management layer 131 has a transmission line that can be connected to the frame grabber 150 in addition to being connected to the lower level protocol layer 132 and the packet format layer 133 as a receiving end. Data transmitted from the rain management layer 131 to the frame grabber 150 can be detected through the frame grabber 150. This will be described later in the description of the frame grabber 150.

The receiving end of the lower level protocol layer 132 configures the data combined by the lane management layer 131 in units of bits. The packet is divided into a long packet and a short packet. Long packets are divided into heads, data, and checksums. The data represents image information in units of bytes, and the checksum is a cyclic redundancy checking (CRC) code for ensuring the reliability of the data. The head consists of a data ID, a word count (WC), and an error correction code (ECC). Data ID is a format of an image such as YUV and RGB, WC is a size of data in a packet, and ECC is a Hamming code capable of 1-bit error correction and 2-bit error detection to ensure header integrity. The short packet has the same structure as the head of the long packet, except that the frame number and the line number are replaced instead of the WC. The short packet is a packet for notifying the beginning and end of a frame and the beginning and end of a line. The short packet is generated by calculating an image size transmitted by a lower protocol layer.

The packet format layer 133 converts byte data received from the lower level protocol layer 132 into pixel data suitable for the camera device.

The first error detection unit 140 is in charge of the original error detection function of the first CSI-2 converter 130, and detects an error of the image data received by the MIPI board 110 through an error detection code. do. The error related information obtained through the first error detection unit 140 is transmitted to the outside through the control transmission line.

The frame grabber 150 includes a second CSI-2 converter 160, a second error detector 170, a framer 180, and a DMA controller 190.

Unlike the conventional frame grabber, the second CSI-2 converter 160 is installed to detect an error of data transmitted from the MIPI board 110 and is input from the outside separately from the first CSI-2 converter 130. Converts the serial packet into image data and performs an inspection in the frame grabber 150 through an error detection code, and transmits the result to the control unit of the inspection system.

Like the first CSI-2 converter 130, the second CSI-2 converter 160 may include a lane management layer, a lower level protocol layer, and a packet format layer.

The second error detection unit 170 is a physical layer structure directly transmitted from the rain management layer 131 of the MIPI board 110 through an error detection code generated during data conversion by the second CSI-2 conversion unit 160. Check the data of the error.

The framer 180 classifies the image data of the second CSI-2 converter 160 in units of frames, and the DMA controller 190 directly transfers the frame defined by the framer 180 to the memory of the inspection system. .

In addition, the error detection apparatus 100 may include a comparison unit comparing the error information detected by the first CSI-2 converter 130 with the error information detected by the second CSI-2 converter 160. If the error is not detected in the first error detector 140 but the second error detector 170 detects the same data, the MIPI board 110 transmits the error to the frame grabber 150. It can be evaluated that there is. That is, such an error is not a problem of the MIPI camera 101, and is reflected in the determination of whether the MIPI camera 101 is successful. Therefore, it is possible to detect the presence or absence of an error in the process of inspecting the MIPI camera 101 can improve the accuracy and reliability of the inspection.

FIG. 2 is a block diagram illustrating an error detection method of image transmission data using an error detection code of a camera inspection system as another example related to the present invention.

In this example, the MIPI board 210 includes a packet conversion module 215 separately from the first CSI-2 converter 230. That is, the parallel camera 202 may be connected to the MIPI board 210 in addition to the MIPI camera 201, and the MIPI board 210 is configured to undergo a step for inspecting the parallel camera. To this end, the packet conversion module 215 converts the parallel packet input from the external interface into a serial packet.

The serial packet converted by the packet conversion module 215 may be configured to be converted into image data in the MIPI board 210 through the first CSI-2 conversion unit 130. The first error detection unit 240 checks an error of the serial packet converted by the packet conversion module 215 by the error detection code generated through the first CSI-2 conversion unit 230.

The packet conversion module 215 and the first CSI-2 converter 230 may be selectively used. That is, the first CSI-2 converter 230 is used to inspect the MIPI camera 201, and the packet conversion module 215 is used to inspect the parallel camera 202.

The frame grabber 250 includes a second CSI-2 converter 260, a second error detector 270, a framer 280, and a DMA controller 290. In the case of inspecting the MIPI camera 201, an error is comprehensively detected through the same process as the above embodiment. When the parallel camera 202 is inspected, the serial packet data received from the MIPI board 210 is converted through the second CSI-2 converter 260 of the frame grabber 250, and the second error detector is detected. 270 checks an error of data transmitted from the packet conversion module 215 through an error detection code. Therefore, the parallel camera 202 also detects an error in the MIPI board 210 through the first CSI-2 converter 230 and in the frame grabber 250 through the second CSI-2 converter 260. Errors can be detected.

The error detection method and the error detection apparatus of the image transmission data using the error detection code of the camera inspection system described above are not limited to the configuration and method of the embodiments described. The embodiments may be configured so that all or some of the embodiments may be selectively combined so that various modifications may be made.

100, 200: error detection device 110, 210: MIPI board (110)
120, 220: D-PHY 130, 230: first CSI-2 conversion unit
131: rain management layer 132: lower level protocol layer
133: packet format layer 140, 240: first error detection unit
150, 250: frame grabber 160, 260: second CSI-2 converter
170 and 270: second CSI-2 converters 180 and 280: framers
190 and 290: DMA controller 215: packet conversion module

Claims (15)

Byte-forming a serial packet received from an external interface and transmitting the byte to a first camera serial interface-2 (CSI-2) converter installed on a mobile industry processor interface (MIPI) board;
Transmitting data merged by a lane management layer in the first CSI-2 converter to a frame grabber; And
Converting the data transmitted from the lane management layer by a second CSI-2 converter installed in the frame grabber, and detecting an error from the converted data, using the error detection code of the camera inspection system. Error detection method of transmission data.
The method of claim 1,
The first CSI-2 converter includes a first low level protocol layer and a first packet format layer.
The error detection method,
And detecting an error after the combined data in the lane management layer of the first CSI-2 converter is sequentially converted through the first lower level protocol layer and the first packet format layer. Error detection method of image transmission data using system error detection code.
The method of claim 2,
Comparing the error detected by the first CSI-2 converter and the error detected by the second CSI-2 converter, Error detection of the image transmission data using the error detection code of the camera inspection system Way.
The method of claim 1,
The second CSI-2 converter includes a second lower level protocol layer and a second packet format layer.
Converting the data transmitted from the lane management layer by a second CSI-2 converter installed in the frame grabber, and detecting an error from the converted data,
And converting the data transmitted from the lane management layer through the second lower level protocol layer and the second packet format layer sequentially and detecting an error, using the error detection code of the camera inspection system. Error detection method of image transmission data.
The method of claim 1,
And the serial packet is received through four lanes. The error detection method of image transmission data using an error detection code of a camera inspection system.
The method of claim 1,
Converting the parallel packet received from the external interface of the MIPI board into a serial packet; And
And transmitting the serial packet to the frame grabber, wherein the error detection code of the camera inspection system is used.
Converting the parallel packet received from the external interface of the MIPI board into a serial packet;
Sending the serial packet to a frame grabber; And
Converting the serial packet by a CSI-2 conversion unit installed in the frame grabber, and detecting an error from the converted data, wherein the error detection code of the camera inspection system uses the error detection code.
A physical layer (D-PHY) circuit unit for byte-forming a serial packet received from an external interface of the MIPI board;
A first CSI conversion unit installed on the MIPI board and including a lane management layer for adding the output signals of the D-PHY circuit unit to a frame grabber;
A second CSI converter installed in the frame grabber and converting data transmitted from the lane management layer into image data; And
And a first error detection unit installed in the frame grabber and detecting an error of data from the second CSI conversion unit.
9. The method of claim 8,
And a second error detection unit installed on the MIPI board and detecting an error of data from the first CSI conversion unit, wherein the error detection code of the camera inspection system is used.
9. The method of claim 8,
The first CSI conversion unit includes a first low level protocol layer and a first packet format layer, and an error detection apparatus for image transmission data using an error detection code of a camera inspection system. .
9. The method of claim 8,
The second CSI conversion unit includes a second low level protocol layer and a second packet format layer, and an error detection apparatus for image transmission data using an error detection code of a camera inspection system. .
9. The method of claim 8,
And a packet conversion module installed on the MIPI board and converting the parallel packet received from the external interface into a serial packet, wherein the error detection code of the camera inspection system utilizes an error detection code.
A packet conversion module for converting a parallel packet received from an external interface of the MIPI board into a serial packet;
A D-PHY circuit unit installed in a frame grabber and configured to byte the data transmitted from the packet conversion module;
A CSI conversion unit including a low level protocol layer and a packet format layer for converting the output signal of the D-PHY circuit unit into image data; And
And an error detection unit for detecting an error of data from the CSI conversion unit. The error detection apparatus of the image transmission data utilizing the error detection code of the camera inspection system.
A CSI conversion unit including a lower level protocol layer and a packet format layer for converting data transmitted from the MIPI board into image data;
A framer for dividing the image data of the CSI conversion unit by frame unit;
A DMA controller for transferring a frame defined by the framer to a memory; And
And an error detection unit for detecting an error of data from the CSI conversion unit.
An external interface for receiving a serial packet;
A physical layer (D-PHY) circuit unit for byte-forming a serial packet received from the external interface; And
A CSI conversion unit including a lane management layer having a transmission unit for combining the output signals of the D-PHY circuit unit and transmitting the summed signal to a frame grabber; And
And an error detection unit for detecting an error of data from the CSI conversion unit.

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