JP2004312301A - Method, system and device for displaying image - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To clearly display an image obtained by photographing the outsides of a vehicle irrespective of the weather outside the vehicle and a time zone. <P>SOLUTION: An image processing ECU 5 is incorporated in a monitor connected to an on-vehicle camera. Image processing ECU 5 reads a luminance change table corresponding to a mode selected in an operation part disposed in the monitor from a table memory 5e, and changes a luminance value with respect to a luminance signal in YUV signals which a plurality of pixels forming the picked up image have based on the read table. Image processing ECU 5 converts the YUV signals including the luminance signal whose luminance value is changed into RGB signals, and displays the image on conversion on a picture of the monitor. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image display method, an image display system, and a display device that enable a captured image of an imaging device to be clearly displayed on a display device regardless of weather outside the vehicle, a time zone, and the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a system in which a camera for imaging outside the vehicle, which is installed at a front portion, a rear portion, or the like of a vehicle, is connected to a monitor installed in a vehicle interior, and an image of the captured outside situation is displayed on the monitor.
[0003]
The above system can display a clear image on the monitor when the outside of the car has a certain brightness such as sunny weather, but the image itself captured by the camera becomes dark and unclear in dark conditions such as at night and evening. This makes it difficult to display a clear image on a monitor. Further, in a state such as rainy weather, the luminance value of the entire image becomes substantially the same, the luminance difference between the object to be imaged and the background or the like becomes small, and the outline or the like of the displayed object tends to be unclear.
[0004]
In order to cope with such a situation, there is a system in which an infrared camera is used as an imaging camera so that an outside state of the vehicle can be appropriately imaged and displayed even in a dark state. There is also a system using a camera that has an infrared light filter and controls a transmission level of the infrared light filter so that a clear image can be captured in both a dark state and a bright state.
[0005]
[Problems to be solved by the invention]
A system using an infrared camera can prevent a captured image from being unclear even in a dark state outside the vehicle, but has a problem that a captured image in a bright state outside the vehicle tends to be unclear. In addition, in a system using a camera having an infrared light filter capable of controlling transmitted light, the size of the camera becomes larger than that of a normal camera, so that the degree of freedom for mounting on a vehicle is reduced, and the vehicle is used for traveling. A problem arises in that it is difficult to secure specifications that can withstand the accompanying vibration and the like.
[0006]
Furthermore, in recent years, a system having a plurality of cameras has become widespread, and when a camera having the above-described infrared light filter is used in such a system, if the degree of control is not unified for each camera, it is displayed on a monitor. There is a problem that the state of the displayed image differs for each camera, which confuses the driver and the passenger who check the image. Furthermore, an infrared camera and a camera having an infrared light filter are more expensive than ordinary cameras, and the cost required for system construction is increased. In particular, the problem of cost increase becomes remarkable in a system having a plurality of cameras. .
[0007]
The present invention has been made in view of the above circumstances, and an image display method capable of clearly displaying an image captured in a dark state by performing image processing for changing a luminance value of the captured image. , An image display system and a display device.
[0008]
It is another object of the present invention to provide an image display system capable of displaying a clear image in accordance with a situation outside a vehicle by allowing a degree of change in a luminance value to be accepted.
Further, it is another object of the present invention to provide an image display system in which the processing load is reduced by performing processing relating to the change of the luminance value based on a table.
Still another object of the present invention is to provide an image display system in which a system configuration is simplified by performing image processing relating to a change in luminance value on a display device.
[0009]
[Means for Solving the Problems]
An image display method according to a first aspect of the present invention is an image display method in which an image captured by an in-vehicle imaging device is displayed on an in-vehicle display device, wherein the imaging device includes a YUV signal associated with a YUV color space for each of a plurality of pixels. The display device changes the luminance value of the luminance signal of the YUV signal included in the input image, and converts the YUV signal having the luminance signal with the changed luminance value into an RGB signal according to an RGB color space. And displaying an image formed by a plurality of pixels each having the converted RGB signal.
[0010]
An image display system according to a second aspect of the present invention is an image display system that displays an image captured by an in-vehicle imaging device on a in-vehicle display device, wherein the image captured by the imaging device is placed in a YUV color space for each of a plurality of pixels. A luminance changing means for changing the luminance value of the luminance signal of the YUV signal, and a YUV signal having the luminance signal whose luminance value has been changed by the RGB signal according to the RGB color space. And a display unit for displaying an image formed by a plurality of pixels each having an RGB signal converted by the conversion unit.
[0011]
The image display system according to a third aspect of the present invention further includes a receiving unit that receives the degree to which the brightness changing unit changes the brightness value, and the brightness changing unit changes the brightness value according to the degree received by the receiving unit. Means is provided.
An image display system according to a fourth aspect of the present invention includes: a storage unit that stores a luminance change table according to a degree of change in a luminance value; and a reading unit that reads a table corresponding to the degree received by the reception unit from the storage unit. And the brightness changing means includes means for changing a brightness value based on the table read by the reading means.
[0012]
An image display system according to a fifth aspect is characterized in that the display device includes the luminance change unit and the conversion unit.
An image display system according to a sixth aspect is characterized in that the display device further includes the reception unit, the storage unit, and the read unit.
[0013]
A display device according to a seventh aspect of the present invention is a display device for a vehicle that displays an externally input image, wherein the luminance of the luminance signal of the YUV signal relating to the YUV color space of each of a plurality of pixels forming the input image. Brightness changing means for changing a value, conversion means for converting a YUV signal having a brightness signal changed by the brightness changing means into an RGB signal relating to an RGB color space, and a plurality of pixels each having an RGB signal converted by the conversion means Means for displaying the image formed by the step (c).
[0014]
In the first invention and the fifth invention, the luminance value of the luminance signal in the image captured by the imaging device is changed by the display device, and the image whose luminance value has been changed is displayed. Can be clearly displayed. For example, when the whole image is dark, the whole image can be displayed clearly by increasing the luminance.When the luminance difference between the object to be imaged and the background is small, the luminance value is set so that the luminance difference between the two becomes large. By changing, the outline of the object can be clearly displayed, which can contribute to enhancing the recognition of the situation outside the vehicle.
[0015]
In addition, since the processing related to the brightness change is collectively performed by the display device, a normal camera can be applied to the imaging device instead of an expensive camera such as an infrared camera, and the cost can be reduced. Even in the case of configuring the system, uniform image quality can be ensured by performing similar brightness change processing on the image captured by each camera.
[0016]
According to the second aspect, the luminance value of the luminance signal in the image captured by the imaging device is changed, and the image whose luminance value has been changed is displayed on the display device, so that an unclear image can be clearly displayed. The situation can be easily understood. The change of the luminance value can be performed by an image processing device or the like connected to both the imaging device and the display device.
[0017]
According to the third aspect of the present invention, since the receiving means for receiving the degree of change in the brightness value is provided, the brightness change processing according to the situation outside the vehicle can be performed. For example, since the overall brightness is low in the nighttime, a clear image can be displayed by accepting the degree of the brightness change so as to raise the entire pixel of the image, and the image of each object reflected in the image such as rainy weather can be displayed. When the difference between the brightness values is small, an image in which the outline of each object is clear can be displayed by accepting a degree related to the brightness change such that the difference between the brightness values increases.
[0018]
According to the fourth aspect, the table stored in the storage unit is read according to the degree of reception by the reception unit, and the luminance change processing is performed based on the read table. In addition, the speed related to the change processing can be improved, and a time delay until display accompanying the change processing can be eliminated to realize real-time display. It should be noted that the table stores several types of brightness change processing according to various conceivable states such as rainy weather, cloudy weather, evening and night, and appropriately reads an appropriate table according to the degree of reception by the receiving means. It is preferable to be able to output.
[0019]
According to the sixth aspect, since the display device includes the receiving unit and the storage unit, the system configuration can be simplified. In addition, as a reception unit, various buttons and switches may be provided on the display device, or a touch panel type screen may be used.
[0020]
According to the seventh aspect, the display device changes the luminance of the image and converts the luminance-changed image into RGB signals in the RGB color space for display. Therefore, an expensive camera such as an infrared camera is used. Even without this, an image captured by a normal camera in a dark state can be clearly displayed.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings showing the embodiments.
FIG. 1 shows an overall configuration of an image display system 1 according to an embodiment of the present invention. The image display system 1 is configured by connecting an in-vehicle camera 2 corresponding to an imaging device mounted in the front center of the vehicle S and a monitor 3 corresponding to a display device mounted in the vehicle via a network cable 4, and the in-vehicle camera 2 is displayed on the monitor 3.
[0022]
The in-vehicle camera 2 shown in FIG. 2 has an imaging element unit 2b composed of a CCD (Charge Coupled Device) facing the imaging lens 2a, and the imaging element unit 2b outputs a captured image to the communication interface 2c. I have. In addition, as shown in FIG. 5, the imaging element unit 2b captures an image 11 having 640 pixels in the horizontal direction (X coordinate) and 480 pixels in the vertical direction (Y coordinate) with the upper left as the origin.
[0023]
The in-vehicle camera 2 is a camera for connecting to a network. In the present embodiment, the in-vehicle camera 2 has specifications conforming to IEEE (Institute of Electrical and Electronics Engineers Inc.) 1394, which is one of the network standards.
[0024]
Therefore, the vehicle-mounted camera 2 transmits an image in a form in which a plurality of pixels forming a captured image each have a YUV signal in the YUV color space in accordance with the IEEE 1394 specification. The captured image is transmitted. In the YUV signal, Y represents a luminance signal, U represents a red color difference, and V represents a blue color difference, and the YUV signal is included in a packet related to transmission.
[0025]
The luminance signal (Y) is given a luminance value in 256 steps of 8 bits. When the luminance value is “0”, the luminance is the darkest, and when the luminance value is “255”, the luminance is the brightest. ing. Further, pixels having a luminance value of about “50” or less are displayed on the monitor 3 as substantially the same black even if the luminance values are different. However, it is difficult to distinguish the “30” pixels. Further, a pixel having a luminance value of about “220” or more is displayed as substantially the same white even if the luminance value is different. For example, a pixel having a luminance value of “220” and a pixel having a luminance value of “240” are displayed. It becomes difficult to distinguish pixels.
[0026]
FIG. 3 shows a front view of the external appearance of the monitor 3, and an image captured by the vehicle-mounted camera 2 is displayed on the screen 3a. The monitor 3 includes an image processing ECU 5 for performing image processing on the transmitted image, and further includes selection switches 6a and 6b and a determination switch at a lower portion of the screen 3a as receiving means for receiving a degree related to a change in luminance. An operation unit 6 having an operation unit 6c is provided.
[0027]
The operation unit 6 is provided with a plurality of modes corresponding to the degree of the luminance change, and selects the mode with the selection switches 6a and 6b and determines the mode selected with the determination switch 6c. The information is transmitted to the image processing ECU 5. Therefore, the degree of luminance change is accepted by the mode being determined in this way. The modes to be selected include a night mode, an evening mode, a rainy mode, a snowfall mode, and a cloudy mode. When the outside of the vehicle is clear, a clear image can be taken and no operation is performed.
[0028]
FIG. 4 is a block diagram showing the internal configuration of the image processing ECU 5. The image processing ECU 5 has a communication interface 5a for connection to the network cable 4, a CPU 5b for performing overall control of the image processing ECU 5, and a dedicated image processing. An image processing ASIC (Application Specific IC) 5c which is a custom IC, a frame memory 5d for temporarily storing an input image, a table memory 5e for storing a table for luminance change processing, and a screen module for processing the processed image. And a communication interface 5f for outputting to the communication interface.
[0029]
The communication interface 5a performs a process of receiving an image packet transmitted from the vehicle-mounted camera 2 through the network cable 4 and transmitting the packet to the image processing ASIC 5c. The frame memory 5d is made of an SDRAM, and temporarily stores an image transmitted according to an instruction from the image processing ASIC 5c.
[0030]
The table memory 5e stores a plurality of tables for changing luminance according to the situation outside the vehicle as storage means, and stores tables such as a table for night, a table for evening, a table for rainy weather, a table for snowfall and There is a table for cloudy weather. Each of the above-described tables is stored in association with a mode to be selected by the operation unit 6 of the monitor 3. The night mode is a night table, the evening mode is an evening table, the rainy mode is a rainy table, The snowfall mode corresponds to a snowfall table, and the cloudy weather mode corresponds to a cloudy table.
[0031]
The nighttime table is a table used in the image processing ASIC 5c when performing brightness change processing on an image captured at nighttime. Since the brightness of the entire image is low at nighttime, the table of FIG. According to the luminance change line H1 shown in the graph G1, the content for increasing the luminance value of the luminance signal of each pixel forming an image is defined for each pixel.
[0032]
A graph G1 in FIG. 6A shows the content of a change process for the luminance value of the nighttime table, and the horizontal axis represents the luminance value of each pixel captured by the vehicle-mounted camera 2 and input to the image processing ECU 5, The vertical axis represents the luminance value changed and output in the image processing based on the nighttime table. The brightness change line H1 in the graph G1 increases the brightness value of 10 to 60 to about 10 to 230 in consideration of the fact that the brightness of most pixels of an image captured at night is distributed in the range of 10 to 60. Means that.
[0033]
For example, when the vehicle-mounted camera 2 captures the image 11 as shown in FIG. 5 at night, the pixel at the point A belonging to the background and located at (X, Y) = (120, 80) has the luminance signal of the luminance value “50”. It is assumed that the pixel at the point B located at (X, Y) = (260, 180) belonging to the object T to be imaged has a luminance signal with a luminance value “25”.
[0034]
In this case, the luminance value “50” at point A is increased to about “180” by the luminance change line H1 in FIG. 6A, and the luminance value “25” at point B is increased to about “90”. By performing such a process on all the pixels forming the image 11 in FIG. 5, the brightness value of the image 11 is changed by the nighttime table defined according to the brightness change line H1, and the brightness is increased.
[0035]
Further, by increasing the luminance value in this way, the difference between the luminance values of point A and point B is increased, so that object T can be clearly distinguished from the background. That is, at the time of input, the difference between the luminance values of point A and point B is "25", but at the time of output, the difference in luminance value is "90". Is obtained so as to obtain an image in which the image clearly appears. Note that the straight line S1 in the graph G1 indicates the relationship between the input and output luminance values when the luminance change processing is not performed (when the weather is fine, etc.) (the same applies to other graphs).
[0036]
Further, the above-mentioned evening table has a prescribed content for increasing the brightness of the entire image in accordance with the night table, but since the evening is slightly brighter than the night, it is changed from the graph G1 in FIG. The content for increasing the luminance value of each pixel is defined based on a graph (not shown) in which the luminance range of the target (range indicated by hatching) is increased.
[0037]
Further, the rainy weather table is a table used in the image processing ASIC 5c when performing brightness change processing on an image captured in rainy weather. Although the brightness itself of the rainy image is higher than at night and in the evening, the brightness difference between the pixels in the entire image is small, so that the rainy weather table follows the brightness change line H2 shown in the graph G2 of FIG. It specifies that the luminance value of the luminance signal of each pixel is changed.
[0038]
The luminance change line H2 in the graph G2 of FIG. 6B showing the contents with respect to the luminance values of the rainy weather table is a range in which the luminance values of most of the pixels of the image captured in rainy weather are in the range of 130 to 220 (the range indicated by hatching). ), The shape is such that the brightness difference in the above range is widened in consideration of the small brightness difference.
[0039]
For example, when the image 11 shown in FIG. 5 is imaged in rainy weather and it is assumed that the pixel at point A belonging to the background has a luminance value of “190” and the pixel at point B has a luminance value of “160”, both points A and B Is 30 and it is difficult to distinguish between the background and the object T when displayed on the monitor 3 as it is.
[0040]
In this case, the luminance value “190” at point A is increased to about “200” based on the luminance change line H2 in FIG. 6B, while the luminance value “160” at point B is reduced to about “90”. Can be As a result, the luminance difference between the two points A and B is “110”, and an image in which the background and the object T are clearly distinguished can be displayed.
[0041]
Further, the above-described snowfall table and cloudy weather table have the specified contents for increasing the luminance difference between the pixels in the image according to the rainy weather table, but the range of the luminance distribution (the range indicated by hatching) is the same as the rainy weather table. Are different from each other, so that the content of changing the luminance value of each pixel is defined based on a graph (not shown) obtained by moving the luminance range to be changed from the graph G2 of FIG. 6B. I have.
[0042]
On the other hand, the image processing ASIC 5c shown in FIG. 4 functions as a reading unit, a luminance changing unit, and a converting unit. As the reading unit, a table corresponding to the mode transmitted from the operation unit 6 of the monitor 3 shown in FIG. A process of reading from the memory 5e is performed. When the mode is not selected on the operation unit 6, the image processing ASIC 5c does not perform the reading process.
[0043]
Further, the image processing ASIC 5c as a brightness changing unit performs a process of changing a brightness value of a brightness signal (Y) of each of a plurality of pixels of an image captured by the vehicle-mounted camera 2 based on the read table. By performing such a brightness change process, an image having a low overall brightness at the time of night imaging can be converted into a bright image, and an image in which the boundary between the background and the object to be imaged is ambiguous as in the case of rainy weather imaging can be sharpened. It can be converted to a certain clear image.
[0044]
By performing the conversion processing based on the table as described above, the processing load of the image processing ASIC 5c is reduced and the processing speed is increased. When the mode is not selected on the operation unit 6, the image processing ASIC 5c does not perform the brightness changing process.
[0045]
Further, the image processing ASIC 5c as a conversion unit performs a color space conversion process of converting the YUV signal of each pixel into an RGB signal (R means red, G means green, and B means blue) related to the RGB color space. This conversion processing is performed on the YUV signal whose luminance value has been changed, and also on the YUV signal whose luminance has not been changed when the mode is not selected due to a clear sky outside the vehicle.
[0046]
Further, an image formed by a plurality of pixels each having the converted RGB signal is output to the communication interface 5f. The communication interface 5f outputs the output image to the screen module constituting the screen 3a in FIG. 3 and displays the image on the screen 3a.
[0047]
Next, an image display method in the image display system 1 having the above configuration will be described with reference to a flowchart shown in FIG.
First, a driver, a passenger, and the like of the vehicle S activate the image display system 1 (S1), and take an image of the outside of the vehicle with the vehicle-mounted camera 2 (S2). The captured images are sequentially output to the image processing ECU 5 of the monitor 3. Next, the driver, the passenger, and the like operate the operation unit 6 of the monitor 3 in consideration of the weather and time zone outside the vehicle, or change the brightness because the outside of the vehicle is capable of capturing a clear and clear image. It is determined that it is not necessary, and accordingly, the image display system 1 enters a state in which the mode related to the luminance change is received by the operation unit 6 or is not received (S3).
[0048]
When the operation unit 6 receives the mode (S3: YES), the image processing ASIC 5c of the image processing ECU 5 reads the corresponding table from the table memory 5e (S4), and the plurality of pixels of the image output based on the read table are displayed. A process of changing the brightness value of each of the brightness signals is performed (S5). On the other hand, when the operation unit 6 does not accept the mode (S3: NO), the image processing ASIC 5c jumps to the next processing step (S6) without performing the above-described table reading and changing the luminance value.
[0049]
Further, the image processing ASIC 5c converts the YUV signal into an RGB signal (S6) and outputs the RGB signal to the screen module to display an image based on the RGB signal in the RGB color space on the screen 3a of the monitor 3 (S7). By displaying the image through such processing, the image display system 1 can clearly display the image captured by the on-vehicle camera 2 on the screen 3a of the monitor 3 without being affected by weather outside the vehicle, time zone, and the like. it's shown.
[0050]
In addition, the image display system 1 according to the present invention is not limited to the above-described embodiment, and various modifications can be applied. For example, a plurality of in-vehicle cameras 2 may be connected to the monitor 3 and images captured by the in-vehicle cameras 2 may be appropriately switched and displayed. In this case, the same brightness change is performed by the image processing ECU 5 of the monitor 3 for the captured image of each vehicle-mounted camera 2, and the monitor 3 has a uniform brightness state even if the vehicle-mounted camera 2 to be imaged is different. Images are displayed to ensure a certain level of visibility.
[0051]
Further, the table memory 5e of the image processing ECU 5 may store a plurality of tables in which the details of the change are defined based on a graph in which the luminance change line differs according to each mode, in addition to the above-described tables. Good. For example, as a rainy weather table, a first rainy weather table and a second rainy weather table are prepared. As described above, the first rainy weather table is defined with the change of the luminance based on the graph G2 in FIG. 6B. On the other hand, the second rainy weather table can be a table in which the details of the change in luminance are defined based on the graph G3 in FIG.
[0052]
The shape of the luminance change line H21 of the graph G3 in FIG. 8A is different from the shape of the luminance change line H2 of the graph G2 in FIG. 6B, and has a shape connected by three straight lines. . Therefore, the second rainy weather table based on the graph G3 in FIG. 8A changes the luminance in the same tendency as the first rainy weather table, but has a different change characteristic in the luminance range of 130 to 220. A sharp image can be obtained. The first and second rainy weather tables and the like are read out by selecting and determining a mode with the operation unit 6 shown in FIG. 3 and further selecting a brightness mode.
[0053]
In addition to the form of the brightness change line, the table in each mode is a table based on a graph G4 having different brightness ranges (hatched ranges) as shown in FIG. 5e, and may be read in response to the operation of the operation unit 6. The graph G4 in FIG. 8B corresponds to a rainy weather table, and the main range of the luminance change is broadened to 110 to 220 with respect to the rainy weather graph G2 in FIG. Is changed.
[0054]
Alternatively, a luminance adjustment dial may be provided on the operation unit 6 of the monitor 3, and the image processing ASIC 5c may increase or decrease the luminance value according to the adjustment amount of the dial. However, in this case, the luminance value exceeding “255” is adjusted to “255” by adjusting the dial, and the luminance value less than “0” is set to “0” to secure a luminance value of 256 levels. Further, the image processing ASIC 5c may change the luminance value based on a conversion formula and a required program in addition to using the table.
[0055]
Furthermore, the image processing ECU 5 may be configured separately from the monitor 3 and may be provided separately. In this case, the table memory 5 e may be left on the monitor 3 from the image ECU 5 that is independent. Further, the operation unit 6 may be configured such that the screen 3a has a touch panel type so that the screen 3a has various operation functions, and the operation unit 6 may be provided separately from the monitor 6. The image display system 1 may be configured to connect the in-vehicle camera 2 and the monitor 3 with a signal line other than a communication line, other than configuring the system with a network.
[0056]
【The invention's effect】
As described in detail above, in the first invention and the fifth invention, a special camera is used because the luminance value in the captured image is changed by the display device and the image related to the change in the luminance value is displayed. And a clear image can be displayed regardless of the situation outside the vehicle.
According to the second aspect of the invention, since the brightness value in the captured image is changed and the image related to the change in the brightness value is displayed on the display device, the captured image obtained by a normal camera can always be clearly displayed.
[0057]
According to the third aspect of the present invention, since the brightness change processing is performed by receiving the degree of the brightness change, the change processing can be realized in detail corresponding to the weather outside the vehicle, the time zone, and the like, and a clearer image display according to the situation can be realized. It can be performed.
According to the fourth aspect of the present invention, since the luminance change table is read in response to the reception of the degree of the luminance change, and the processing relating to the luminance change is performed based on this table, the processing load of the luminance change can be reduced.
[0058]
According to the sixth aspect, since the display device includes the receiving unit, the storage unit, and the reading unit, the configuration of the system can be simplified.
According to the seventh aspect, the display device changes the brightness of the image and converts the brightness-changed image into an RGB signal and displays the RGB signal. It can be clearly displayed regardless of.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an image display system according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of an imaging device.
FIG. 3 is an external front view of the monitor.
FIG. 4 is a block diagram illustrating an internal configuration of an image processing ECU.
FIG. 5 is a schematic diagram illustrating an image captured by a vehicle-mounted camera.
6A is a graph for changing luminance corresponding to a nighttime table, and FIG. 6B is a graph for changing luminance corresponding to a rainy day table.
FIG. 7 is a flowchart showing a series of processing procedures of an image processing method in the image display system.
FIG. 8A is a graph for changing the luminance of a modification corresponding to the rainy weather table, and FIG. 8B is a graph of another modification.
[Explanation of symbols]
1 Image display system
2 In-vehicle camera
3 Monitor
3a screen
4 Network cable
5 Image processing ECU
5c Image processing ASIC
5e Table memory
6 Operation section
S vehicle
T object

Claims (7)

An image display method of displaying an image captured by an in-vehicle imaging device on a in-vehicle display device,
The imaging device,
Outputting an image having a YUV signal relating to the YUV color space to each of a plurality of pixels,
The display device,
Change the luminance value of the luminance signal of the YUV signal of the input image,
Converting a YUV signal having a luminance signal whose luminance value has been changed into an RGB signal relating to an RGB color space;
An image display method comprising displaying an image formed by a plurality of pixels each having a converted RGB signal. In an image display system that displays an image captured by a vehicle-mounted imaging device on a vehicle-mounted display device,
The image captured by the imaging device has a YUV signal related to a YUV color space for each of a plurality of pixels,
Brightness changing means for changing the brightness value of the brightness signal of the YUV signal;
Converting means for converting a YUV signal having a luminance signal whose luminance value has been changed by the luminance changing means into an RGB signal relating to an RGB color space;
The display device,
An image display system comprising: means for displaying an image formed by a plurality of pixels each having an RGB signal converted by the conversion means. The apparatus further includes a receiving unit that receives the degree to which the luminance changing unit changes the luminance value,
The image display system according to claim 2, wherein the brightness changing unit includes a unit that changes a brightness value according to a degree received by the receiving unit. Storage means for storing a luminance change table according to the degree of change in the luminance value;
Reading means for reading a table corresponding to the degree received by the receiving means from the storage means,
The image display system according to claim 3, wherein the brightness changing unit includes a unit that changes a brightness value based on the table read by the reading unit. The display device,
The image display system according to claim 2, further comprising the brightness changing unit and the conversion unit. The display device further comprises:
6. The image display system according to claim 5, comprising the receiving unit, the storage unit, and the reading unit. In an in-vehicle display device that displays an image input from the outside,
A luminance changing unit that changes a luminance value of a luminance signal of a YUV signal relating to a YUV color space of each of a plurality of pixels forming an input image;
Converting means for converting a YUV signal having a luminance signal changed by the luminance changing means into an RGB signal relating to an RGB color space;
Means for displaying an image formed by a plurality of pixels each having an RGB signal converted by the conversion means.

Images