CN1601366A - Previewing system of digital code camera - Google Patents
Previewing system of digital code camera Download PDFInfo
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- CN1601366A CN1601366A CN 03157492 CN03157492A CN1601366A CN 1601366 A CN1601366 A CN 1601366A CN 03157492 CN03157492 CN 03157492 CN 03157492 A CN03157492 A CN 03157492A CN 1601366 A CN1601366 A CN 1601366A
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Abstract
The invention relates to a previewing system of digital camera. Said system includes shooting device, image signal processing device and display device. The shooting device can be used for inducing matter image to produce first image signal, the image signal processing device can be used for modifying first image signal and then producing second image signal, and transferring said modified second image signal to display device so as to provide previewing function for photography. Said invention provides a simple image processing circuit, and uses multiquayscale super twistea nematic liquid crystal display (STN-LCD), so that as companed with existent thin-film transistor liquid crystal display CTFT-LCD said invention has the advantages of saving electricity, and simple circuit, etc.
Description
Technical field
The present invention relates to a kind of digital still camera, particularly relate to a kind of pre-viewing system of digital still camera.
Background technology
No matter be in life or work on, usually need camera will be at that time image retain.For the image of determining picked-up is true is required, so need a pre-viewing system to find a view with auxiliary.Existing traditional pre-viewing system is an optics picture window, places the phtographic lens top.According to the being seen image light of optics picture window origin classification, can be divided into S.L.R and eyes camera.The observed image light of the optics picture window of eyes camera is to be entered by the picture window camera lens that is different from phtographic lens, thereby causes a subtense angle, and makes some elementary errors distance between the scene of the scene of observation and actual photographed.For improving this shortcoming,, promptly provide the optics picture window required image by phtographic lens so there is the design of S.L.R to produce.
And in today, digital still camera replaces traditional camera gradually with its unique superiority.In digital still camera, the pre-viewing system of an electronics is set so that find a view, function class is like the optics picture window of traditional S.L.R.The existing known pre-viewing system of electronics is that (Thin Film Transistor Liquid Crystal Display TFT-LCD), is about to the picture of taking so that in time show phtographic lens to colorful film transistor liquid crystal display (TFT-LCD) of device.Yet because very power consumption of Via Color TFT-LCD, often for electric power enough can be taken for a long time, the general practice provides switch of user to close the pre-viewing system of this electronics, by this to save power supply.In addition, and an optics picture window is set, its function is just as traditional eyes camera.The optics picture window is applied to digital still camera, and its advantage is that mechanism is simple, and need not consume electric power.Because the optics picture window is different with the position of phtographic lens, when shooting at close range, will produce unavoidable subtense angle phenomenon, the aniseikonia of being seen when promptly taking is same as the image of taking the photograph.
Because the Via Color TFT-LCD power consumption enough can be taken for a long time in order to make electric power, and make two kinds of pre-viewing systems of optics picture window and Via Color TFT-LCD simultaneously and deposit, can provide the user optionally to select it for use.Therefore, the volume of digital still camera just can't dwindle more because of placing this picture window, pursues under the compact trend at electronic product now, and the design of existing known product does not obviously meet user's demand.
Moreover, the cost costliness of Via Color TFT-LCD, driving circuit is complicated, thereby makes that the production cost of digital still camera is high.
Seeing also shown in Figure 1ly, is the previewing circuit system calcspar of existing known TFT-LCD that digital still camera uses.Its object image 105 sees through camera 110 with photovoltaic principals and transfers a succession of voltage signal 115 to scan mode, and (Color Filter Array CFA) 120 is separated into three primary colors signal 125 with voltage signal 115 to pass through the color filtration array again.When shot object ambient light illumination at that time may be too bright or too dark, perhaps may because of the difference of light source (as sunlight, tungsten light, daylight lamp ... Deng) and the color that causes the object of taking the photograph deviation to some extent, and must make a white-balance correction (WhiteBalance) at light source.So three primary colors signal 125 is sent to white balance circuit 130, after finishing white-balance correction, produces image signal 135.Along with the difference of camera 110 kinds, it is also just different to take the resulting color signal in back for same object, so need to do color correction (Color Correction) at the characteristic of this camera.So image signal 135 need be delivered to color correction circuit 140 again and adjust its color representation, then produces image signal 145.In addition, the voltage that photosensitive pixel produced in the camera 110, with the performance of the printing opacity of TFT-LCD 190, the two (linear) relation that is not linear.Desire to make the brightness performance of shooting can correctly store and be revealed among the TFT-LCD 190, image signal must be applied character used in proper names and in rendering some foreign names agate correction (Gamma Correction).Therefore, image signal 145 is delivered to character used in proper names and in rendering some foreign names agate correction circuit 150, obtain revised image signal 155.Then must carry out form and aspect conversions (color spacetransform), to import image and represent redness (red respectively, R), green (green, G) and blue (blue, B) etc. three primary colors convert brightness (luminance) and chroma (chrominance) to, and the pattern of separation is Y, Cb, Cr; Wherein Y represents brightness, and Cb and Cr represent chroma.The fundamental purpose that converts brightness and chroma pattern to is because human eyes are higher than chroma to the susceptibility of brightness.So image signal 155 through form and aspect change-over circuit 160, is converted to Y, Cb, Cr with R, G, B, gets an image signal 165.Again utilize edge strengthening circuit (Edge Enhance) 170 to make image distinct more sharp keen, produce image signal 175 thereafter.The image size of this moment depends on camera 110, and this size may be inequality with 190 image size that can show of TFT-LCD.In order in TFT-LCD, to show complete image, so image signal 175 must be adjusted its resolution with mathematical method, adjust this image so use flat image to adjust circuit (2-D Image Scalar) 180, get an image signal 185.At last image signal 185 is imported Via Color TFT-LCD 190, and correctly show this image.
From the above, the image-processing circuit that has the known employed pre-viewing system of digital still camera now is complicated, and power consumption and manufacturing cost also increase thereupon.In addition, have the Via Color TFT-LCD of known power consumption that digital still camera uses now, often cause its power shortage, therefore can't use for a long time because use TFT-LCD continuously.And the use Via Color TFT-LCD has the higher shortcoming of its cost of parts again.Moreover, often must put an optics picture window in addition on digital still camera because of the Via Color TFT-LCD power consumption, make small product size strengthen, reduce carrying convenience, increase cost simultaneously.Pursue under the compact trend at electronic product now, the design of existing known product obviously is not inconsistent demand.
This shows that the pre-viewing system of above-mentioned existing digital still camera still has many defectives, and demands urgently further being improved.The problem that exists for the pre-viewing system that solves digital still camera, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that the pre-viewing system of above-mentioned existing digital still camera exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge thereof, actively studied innovation, in the hope of founding a kind of pre-viewing system of novel digital still camera, can improve the pre-viewing system of general existing digital still camera, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective of the pre-viewing system existence of existing digital still camera, and a kind of pre-viewing system of digital still camera of new structure is provided, technical matters to be solved is to make it can reduce power consumption, prolong the service time of camera, and can meet user demand more.
Of the present invention time a purpose is that a kind of pre-viewing system of digital still camera is provided, and technical matters to be solved is to make it can simplify image-processing circuit, thereby is suitable for practicality more.
Another object of the present invention is to, a kind of pre-viewing system of digital still camera is provided, technical matters to be solved is to make it no longer need traditional optical profile type picture window.
A further object of the present invention is, a kind of pre-viewing system of digital still camera is provided, and technical matters to be solved is that it can be reduced cost, and has the value on the industry, thereby can increase the market competitiveness.
Purpose of the present invention and to solve its technical problem underlying be to adopt following technical scheme to realize.The pre-viewing system of a kind of digital still camera that proposes according to the present invention, this pre-viewing system comprises: a camera produces one first image signal; One image signal treating apparatus will obtain having one second image signal of gray-level characteristic after this first image signal correction; And a display device, provide photography pre-visual function according to this second image signal.
The object of the invention to solve the technical problems can also be further achieved by the following technical measures.
The pre-viewing system of aforesaid digital still camera, wherein said display device comprise a STN Super TN type LCD (Super Twisted Nematic Liquid CrystalDisplay, STN-LCD).
The pre-viewing system of aforesaid digital still camera, wherein said STN Super TN type LCD is used the STN Super TN type LCD of many GTGs.
The pre-viewing system of aforesaid digital still camera, wherein said STN Super TN type LCD is used the STN Super TN type LCD of black and white second order.
The pre-viewing system of aforesaid digital still camera, the STN Super TN type LCD of wherein said black and white second order are to utilize shake (dither) technical modelling to become the display effect of the STN Super TN type LCD of many GTGs.
The pre-viewing system of aforesaid digital still camera, wherein said image signal treating apparatus comprises: a shellfish and data totalizer (Bayer Data Accumulator) receives this first image signal and produces one first temporary transient image signal; One brightness regulating circuit (Brightness Scalar) receives this first temporary transient image signal and produces one second temporary transient image signal; One character used in proper names and in rendering some foreign names agate correction circuit (GammaCorrection) receives this second temporary transient image signal and produces one the 3rd temporary transient image signal; And one flat image adjust circuit (2D Image Scalar), receive the 3rd temporary transient image signal and produce this second image signal.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, major technique of the present invention thes contents are as follows:
The present invention proposes a kind of pre-viewing system of digital still camera, and this system comprises a camera, an image signal treating apparatus and a display device.This camera is that the conversion of image light is produced first image signal.This image signal treating apparatus is with the characteristic of first image signal according to camera and power saving display device, do a simple and effective image correction after, produce second image signal.Revised second image signal of image is sent to display device, the pre-visual function that provides when taking is provided.
Described according to preferred embodiment of the present invention, above-mentioned display device can adopt the display device of power saving, for example STN Super TN type LCD (Super Twisted Nematic LiquidCrystal Display, STN-LCD).Wherein STN-LCD can select to use the STN-LCD of many GTGs in the hope of preferable image quality.Or the STN-LCD of use black and white second order, and utilize and shake the display effect that (dither) technical modelling becomes the STN-LCD of many GTGs, in the hope of reducing cost.
Described according to preferred embodiment of the present invention, above-mentioned image signal treating apparatus, comprise a shellfish and data (data is data, below all be called data) totalizer (Bayer Data Accumulator), a brightness regulating circuit (Brightness Scalar), a character used in proper names and in rendering some foreign names agate correction circuit (Gamma Correction) and a flat image are adjusted circuit (2D Image Scalar).Above-mentioned shellfish and data totalizer are in order to receive first image signal and to produce the first temporary transient image signal.Above-mentioned brightness regulating circuit is in order to receive this first temporary transient image signal and to produce the second temporary transient image signal.And behind the above-mentioned character used in proper names and in rendering some foreign names agate correction circuit reception second temporary transient image signal, produce the 3rd temporary transient image signal.At last, above-mentioned flat image adjustment circuit receives the 3rd temporary transient image signal and produces second image signal.
Display device of the present invention, it is the display device that belongs to power saving, as the employed many GTGs STN-LCD of preferred embodiment, therefore (Thin Film Transistor Liquid Crystal Display TFT-LCD) has advantages such as power saving, with low cost and driving circuit be simple to existing known employed colorful film transistor liquid crystal display (TFT-LCD).Moreover, because of the electricity-saving characteristic of many GTGs STN-LCD, and can use for a long time, that is can remove unnecessary optical profile type picture window.The digital still camera volume is littler, cost is cheaper so can make.
Therefore as can be known, the pre-viewing system of the digital still camera of new structure of the present invention mainly is to comprise camera, image signal treating apparatus and display device.Camera is an induction image in kind and produce first image signal.The image signal treating apparatus produces second image signal after with the first image signal correction, should be sent to display device so that the pre-visual function of photographing to be provided by revised second image signal again.The present invention proposes a kind of simple image-processing circuit, other uses many GTGs STN Super TN type LCD (Super Twisted Nematic Liquid Crystal Display, STN-LCD), therefore (Thin Film TransistorLiquid Crystal Display TFT-LCD) has advantages such as power saving, with low cost and circuit be simple to existing known employed colorful film transistor liquid crystal display (TFT-LCD).Moreover, because the electricity-saving characteristic of many GTGs STN-LCD, and can use for a long time, that is can save unnecessary optical profile type picture window.So, can make that the digital still camera volume is littler, cost is cheaper.
In sum, the pre-viewing system of the digital still camera of special construction of the present invention can reduce power consumption, prolongs the service time of camera, and can meet user demand more; It can simplify image-processing circuit in addition, thereby is suitable for practicality more; Moreover it no longer needs traditional optical profile type picture window, can reduce cost, and have value on the industry, thereby can increase the market competitiveness.It has above-mentioned many advantages and practical value, and in like product, do not see have similar structural design to publish or use and really genus innovation, no matter it structurally or bigger improvement all arranged on the function, have large improvement technically, and produced handy and practical effect, and the pre-viewing system of more existing digital still camera has the multinomial effect of enhancement, thus be suitable for practicality more, and have the extensive value of industry, really be a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
Description of drawings
Fig. 1 is the existing known employed previewing circuit system of digital still camera calcspar.
Fig. 2 is the previewing system block diagrams according to a kind of digital still camera of a preferred embodiment of the present invention.
Fig. 3 is the previewing system block diagrams according to a kind of digital still camera of another preferred embodiment of the present invention.
105: image.
110,210,310: camera.
115: voltage signal.
120: color filtration array (Color Filter Array, CFA) (array)
125: the three primary colors signal.
135,145,155,165,175,185: image signal
215,225,315,325,335,345,355: image signal.
130: white balance circuit (White Balance).
140: color correction circuit (Color Correction).
150,340: character used in proper names and in rendering some foreign names agate correction circuit (Gamma Correction).
160: the form and aspect change-over circuit (color space transform, RGB-＞YcbCr).
170: edge strengthening circuit (Edge Enhance).
180,350: flat image is adjusted circuit (2D Image Scalar).
190: Via Color TFT-LCD.
220: the image signal treating apparatus.
230,360: STN Super TN type LCD (STN-LCD).
320: shellfish and data totalizer (Bayer Data Accumulator)
330: brightness regulating circuit (Brightness Scalar)
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, its embodiment of pre-viewing system, structure, feature and the effect thereof of the digital still camera that foundation the present invention is proposed, describe in detail as after.
See also shown in Figure 2ly, it is the previewing system block diagrams according to a kind of digital still camera of a preferred embodiment of the present invention.The pre-viewing system of this digital still camera, comprise camera 210, image signal treating apparatus 220 and STN Super TN type LCD (Super Twisted Nematic LiquidCrystal Display, for convenience of description, be designated hereinafter simply as " STN-LCD ") 230.Object image 205 is seen through camera 210 with photovoltaic principals transfer an image signal 215 to scan mode.Image signal treating apparatus 220 is the characteristic of image signal 215 according to camera 210 and STN-LCD 230, do a simple and effective image correction after, obtain image signal 225.Last STN-LCD 230 provides the pre-visual function when taking according to image signal 225 show images.
According to preferred embodiment of the present invention, aforesaid STN-LCD 230, the STN Super TN type LCD that can use many GTGs to be providing preferable image quality, or the STN Super TN type LCD of using the black and white second order is to reduce cost.Wherein, can utilize shake (dither) technical modelling to become the display effect of the STN-LCD of many GTGs if use the STN-LCD of black and white second order.
See also shown in Figure 3ly, it is the previewing system block diagrams according to a kind of digital still camera of another preferred embodiment of the present invention.In the drawings, the pre-viewing system of this digital still camera comprises camera 310, shellfish and data totalizer (Bayer Data Accumulator) 320, brightness regulating circuit (BrightnessScalar) 330, character used in proper names and in rendering some foreign names agate correction circuit (Gamma Correction) 340, flat image are adjusted circuit (2-D Image Scalar) 350 and STN-LCD 360.Object image 305 is seen through camera 310 with photovoltaic principals transfer a succession of image signal 315 to scan mode.Because camera 310 is with shellfish and chromatic image array (the Bayer color imaging array) mode that scans line by line converts the image signal 315 of series form to, rather than according to the order of pixel, so must be with three primary colors R (red), the G (green) of the same pixel of Bayer data, B (blue) signal progressive mean respectively.Relevant shellfish and the image treatment method of data totalizer 320 sees also the 3rd, 971, No. 065 patent of the U.S..Therefore, image signal 315 needs the process shellfish and data totalizer 320, and with R, G, the B signal difference progressive mean of same pixel, generation is according to the image signal 325 of pixel order.In addition because shot object ambient light illumination at that time may be too bright or too dim, perhaps may because of the difference of optical source wavelength (as sunlight, tungsten light, daylight lamp ... Deng) and the color that causes the object of taking the photograph deviation to some extent, and must revise at light illumination.So three primary colors image signal 325 is sent to brightness regulating circuit 330, after finishing the brightness adjustment, produces image signal 335.Moreover, the voltage that photosensitive pixel produced in the camera 310, with the printing opacity of STN-LCD 360 performance (anglec of rotation of liquid crystal), the two (linear) relation that is not linear.Desire to make the brightness of shooting and chroma performance can correctly store and be revealed among the STN-LCD 360, image signal 335 must be applied character used in proper names and in rendering some foreign names agate correction (Gamma Correction).Therefore, image signal 335 is delivered to character used in proper names and in rendering some foreign names agate correction circuit 340, obtain revised image signal 345.The image size of this moment depends on camera 310, and this size may be inequality with 360 image size that can show of STN-LCD.In order in STN-LCD 360, to show complete image, so image signal 345 must be adjusted its resolution (resolution) with mathematical method, adjust this image so use flat image to adjust circuit 350, obtain an image signal 355.At last image signal 355 is imported STN-LCD 360, and correctly show this image, provide photography pre-visual function.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, but every content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (6)
1, a kind of pre-viewing system of digital still camera is characterized in that this pre-viewing system comprises:
One camera produces one first image signal;
One image signal treating apparatus will obtain having one second image signal of gray-level characteristic after this first image signal correction; And
One display device provides photography pre-visual function according to this second image signal.
2, the pre-viewing system of digital still camera according to claim 1, it is characterized in that wherein said display device comprise a STN Super TN type LCD (Super Twisted NematicLiquid Crystal Display, STN-LCD).
3, the pre-viewing system of digital still camera according to claim 2 is characterized in that wherein said STN Super TN type LCD uses the STN Super TN type LCD of many GTGs.
4, the pre-viewing system of digital still camera according to claim 2 is characterized in that wherein said STN Super TN type LCD uses the STN Super TN type LCD of black and white second order.
5, the pre-viewing system of digital still camera according to claim 4, the STN Super TN type LCD that it is characterized in that wherein said black and white second order are to utilize shake (dither) technical modelling to become the display effect of the STN Super TN type LCD of many GTGs.
6, the pre-viewing system of digital still camera according to claim 1 is characterized in that wherein said image signal treating apparatus comprises:
One shellfish and data totalizer (Bayer Data Accumulator) receives this first image signal and produces one first temporary transient image signal;
One brightness regulating circuit (Brightness Scalar) receives this first temporary transient image signal and produces one second temporary transient image signal;
One character used in proper names and in rendering some foreign names agate correction circuit (Gamma Correction) receives this second temporary transient image signal and produces one the 3rd temporary transient image signal; And
One flat image is adjusted circuit (2D Image Scalar), receives the 3rd temporary transient image signal and produces this second image signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03157492 CN1601366A (en) | 2003-09-22 | 2003-09-22 | Previewing system of digital code camera |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03157492 CN1601366A (en) | 2003-09-22 | 2003-09-22 | Previewing system of digital code camera |
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| CN1601366A true CN1601366A (en) | 2005-03-30 |
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| CN 03157492 Pending CN1601366A (en) | 2003-09-22 | 2003-09-22 | Previewing system of digital code camera |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI394439B (en) * | 2008-10-01 | 2013-04-21 | Altek Corp | A digital still camera with previewing function by picture in picture and method thereof |
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2003
- 2003-09-22 CN CN 03157492 patent/CN1601366A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI394439B (en) * | 2008-10-01 | 2013-04-21 | Altek Corp | A digital still camera with previewing function by picture in picture and method thereof |
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