CN104427254A - Light sensing control method and light sensing control device - Google Patents
Light sensing control method and light sensing control device Download PDFInfo
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- CN104427254A CN104427254A CN201310410033.9A CN201310410033A CN104427254A CN 104427254 A CN104427254 A CN 104427254A CN 201310410033 A CN201310410033 A CN 201310410033A CN 104427254 A CN104427254 A CN 104427254A
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Abstract
The invention discloses a light sensing control method and a light sensing control device. The light sensing control method comprises the following steps: performing photometric analysis on a preview image of a collected scene, dividing the collected preview image into a plurality pixel regions, and calculating a light intensity value of each pixel region of the plurality of pixel regions; calculating the corresponding light sensing time of each pixel region of the collected preview image according to the calculated light intensity values of the plurality of pixel regions; and performing light sensing on each pixel region according to the corresponding light sensing time. By adopting the light sensing control method and the light sensing control device disclosed by the invention, phenomena of overexposure and underexposure possibly occur when too dark areas or too bright areas synchronously exist in a shoot scene can be effectively avoided.
Description
Technical field
The present invention relates to CMOS sensitive technologies field, and relate more specifically to a kind of photosensitive control method and sensitive control device.
Background technology
Although CMOS is widely used in digital camera, but causes because the photosensitive territory of CMOS is limited in photographed scene in many cases and cross dark or excessively bright region and cannot coexist in the image under same exposure parameter.
Such as, when CMOS produces the pixel data of 24 bits, R, G, B tri-look be respectively 8 bits, therefore R, G, B tri-the ratio of the sub-pixels high-high brightness that can reflect separately and minimum brightness should 2
8within.In photographed scene R, G, B tri-look any one high-high brightness and the ratio of minimum brightness exceed 2
8when, the problem of overexposure or under-exposure just may be there is when applying same exposure parameter and taking the photo of this scene.Such as, for the region that light intensity is stronger, may overexposure situation be there is, and for the more weak region of light intensity, under-exposed situation may be occurred.
In order to solve the problem that the bright or excessively dark region of such mistake cannot coexist, propose high dynamic range images treatment technology (HDR), although it can compensate the image local caused due to overexposure or under-exposure to a certain extent and cross bright or excessively dark problem, if but between two adjacent width images, existence is shaken, be then difficult to carry out HDR synthesis.
Therefore, need a kind of photosensitive control method and sensitive control device, it can avoid occurring overexposure or under-exposed phenomenon when taking.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of photosensitive control method and sensitive control device, by the sensitive time according to each pixel region in the light intensity adjustment CMOS of regional in photographed scene, and in photo-process for each pixel region in CMOS respectively according to carrying out photosensitive the sensitive time of its correspondence, can increase the photosensitive territory of CMOS, making in same photographic images, cross secretly or cross bright area can coexist.
According to an aspect of the present invention, provide a kind of photosensitive control method, comprise: light-metering analysis is carried out to the preview image of gathered scene, the preview image of described collection is divided into multiple pixel region, light intensity value is calculated for each pixel region in described multiple pixel region; For the preview image of described collection, according to the light intensity value of calculated described multiple pixel region, calculate described each pixel region corresponding sensitive time; And for described each pixel region, carry out photosensitive according to its corresponding sensitive time.
According to a further aspect of the invention, provide a kind of sensitive control device, comprise: image analysis part, for carrying out light-metering analysis to the preview image of the scene gathered, the preview image of described collection is divided into multiple pixel region, light intensity value is calculated for each pixel region in described multiple pixel region; Sensitive time, calculating unit, for the preview image for described collection, according to the light intensity value of calculated described multiple pixel region, calculated described each pixel region corresponding sensitive time; And sensitive time control assembly, for for described each pixel region, carry out photosensitive according to its corresponding sensitive time to it.
Adopt according to photosensitive control method of the present invention and sensitive control device, corresponding sensitive time is arranged respectively for each pixel region in CMOS, and control the photo-process of each pixel region according to set sensitive time, make effectively to avoid in photographed scene, there is overexposure that is dark or that cross bright area and may occur and under-exposed phenomenon simultaneously.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in specification, claims and accompanying drawing and obtain.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 illustrates the schematic diagram of the photo-process of existing CMOS;
Fig. 2 illustrates the flow chart of the photosensitive control method according to the embodiment of the present invention;
Fig. 3 illustrates the indicative flowchart carrying out light-metering analysis when collection two preview images and determine sensitive time in the photosensitive control method according to the embodiment of the present invention;
Fig. 4 illustrates the indicative flowchart carrying out light-metering analysis when a collection preview image and determine sensitive time in the photosensitive control method according to the embodiment of the present invention;
Fig. 5 A illustrates a kind of particular flow sheet of pixel intensity determining step in the photosensitive control method according to the embodiment of the present invention;
Fig. 5 B illustrates the another kind of particular flow sheet of pixel intensity determining step in the photosensitive control method according to the embodiment of the present invention;
Fig. 6 illustrates the schematic diagram of the CMOS photo-process according to the embodiment of the present invention;
Fig. 7 illustrates the schematic block diagram of the sensitive control device according to the embodiment of the present invention;
Fig. 8 illustrate according to the image analysis part in the sensitive control device of the embodiment of the present invention and sensitive time calculating unit the first schematic block diagram;
Fig. 9 illustrate according to the image analysis part in the sensitive control device of the embodiment of the present invention and sensitive time calculating unit the second schematic block diagram;
Figure 10 A illustrates the first concrete block diagram according to the brightness value determining means in the sensitive control device of the embodiment of the present invention; And
Figure 10 B illustrates the second concrete block diagram according to the brightness value determining means in the sensitive control device of the embodiment of the present invention.
Embodiment
Describe in detail with reference to the accompanying drawings according to each embodiment of the present invention.Here it is to be noted that it in the accompanying drawings, identical Reference numeral is given there is identical or similar structures and function part substantially, and the repeated description of will omit about them.
As shown in Figure 1, the schematic diagram of the photo-process of existing CMOS is illustrated.In the photo-process of existing CMOS, all sub-pixels all carry out photosensitive according to same exposure parameter, all sub-pixels carry out according to described same exposure parameter photosensitive after, namely, after the photosensitive end of all sub-pixels, read the quantity of electric charge (or capacitance voltage) that stores in electric capacity in each sub-pixel in the often row sub-pixel of CMOS line by line and correspondingly the read quantity of electric charge (or capacitance voltage) stored in memory.
Due to when the capacitance of electric capacity is certain, the quantity of electric charge stored in electric capacity is directly proportional to capacitance voltage, therefore launches to describe with the quantity of electric charge stored in electric capacity in this application, but should be appreciated that the embodiment of the present invention similarly can apply capacitance voltage.
Therefore, as previously mentioned, in the photo-process of existing CMOS, the sensitive time of each sub-pixel is unified, there is the bright phenomenon with there is overexposure or under-exposure when crossing dark areas in photographic images thus in photographed scene simultaneously.
In embodiments of the present invention, wish by differently adjusting the phenomenon avoiding overexposure in photographic images or under-exposure sensitive time for different subpixel.
As shown in Figure 2, the flow chart of the photosensitive control method according to the embodiment of the present invention is illustrated.
Photosensitive control method according to the embodiment of the present invention starts in step S201.
In step S210, light-metering analysis is carried out to the preview image of gathered scene, the preview image of described collection is divided into multiple pixel region, light intensity value is calculated for each pixel region in described multiple pixel region.
In step S220, for the preview image of described collection, according to the light intensity value of calculated described multiple pixel region, calculate described each pixel region corresponding sensitive time.
By carrying out light-metering analysis, the light intensity situation at regional in photographed scene (each pixel region (even each pixel) corresponding to CMOS) place can be determined, thus make it possible to adjust sensitive time according to the light intensity situation at regional place in determined photographed scene individually for each pixel region of CMOS.
According to the embodiment of the present invention, can according to different exposure parameter collection at least two preview images, wherein, in each preview image, the view data of all sub-pixels is carried out photosensitive according to same exposure parameter and obtains, and then carries out light-metering analysis according to described at least two preview images.
Illustrate the indicative flowchart carrying out light-metering analysis when collection two preview images and determine sensitive time in figure 3.
In step S310, calculate and utilize the first light intensity value carrying out each pixel region in the first photosensitive obtained preview image the first sensitive time, and calculating utilizes the second light intensity value carrying out each pixel region in the second photosensitive obtained preview image the second sensitive time, described first sensitive time is different from described second sensitive time.
Such as, described second sensitive time is longer than the first sensitive time, and described second sensitive time is acquiescence sensitive time, and described first sensitive time is the sensitive time short and longer than minimum sensitive time than acquiescence sensitive time.In the case, can come in such a way for each pixel region arranges sensitive time.
In step S320, judge whether the first light intensity value is greater than the first predetermined Intensity threshold.
When judging that the first light intensity value is greater than the first predetermined Intensity threshold in step s 320, judge that the first and second sensitive times are long, in step S330, the sensitive time of this pixel region is set to be less than for the first sensitive time and is more than or equal to minimum sensitive time.
When judging that the first light intensity value is not more than the first predetermined Intensity threshold in step s 320, judge whether the second light intensity value is greater than the first predetermined Intensity threshold in step S340.
When judging that in step S340 the second light intensity value is greater than the first predetermined Intensity threshold, determine that the second sensitive time is long, the sensitive time of this pixel region is set to be less than described second sensitive time and be more than or equal to described minimum sensitive time, such as described first sensitive time in step S350.
When judging that in step S340 the second light intensity value is not more than the first predetermined Intensity threshold, in step S360, judge whether the second light intensity value is less than the second predetermined Intensity threshold, the second predetermined Intensity threshold is less than the first predetermined Intensity threshold.
When judging that in step S360 the second light intensity value is less than the second predetermined Intensity threshold, judge that the first and second sensitive times are too short, in step S370 the sensitive time of this pixel be set to be greater than for the second sensitive time and be less than or equal to maximum sensitive time.
When judging that in step S360 the second light intensity value is not less than the second predetermined Intensity threshold, in step S380, judge whether the first light intensity value is less than the second predetermined Intensity threshold.
When judging that in step S380 the first light intensity value is less than the second predetermined Intensity threshold, determine that the first sensitive time is too short, the sensitive time of this pixel region is set to be greater than described first sensitive time and be less than or equal to described maximum sensitive time, such as described second sensitive time in step S390.
When judging that in step S380 the first light intensity value is not less than the second predetermined Intensity threshold, namely, the sensitive time of pixel region, all between the first predetermined Intensity threshold and the second predetermined Intensity threshold, is set to described second sensitive time or described first sensitive time by the first light intensity value and the second light intensity value in step S395.
According to the embodiment of the present invention, alternatively, preview image can also be gathered according to a certain default exposure parameter, analyze in the preview image gathered whether there is overexposure region and/or region of underexposure, and then the sensitive time of each pixel region is set according to analysis result.Such as, light-metering analysis can be carried out to the preview image gathered according to acquiescence exposure parameter.
Illustrate the indicative flowchart carrying out light-metering analysis when a collection preview image and determine sensitive time in the diagram.In the diagram, illustrate only the operating procedure that a pixel region is carried out, therefore should be appreciated that, for the preview image gathered according to acquiescence exposure parameter, the operation shown in Fig. 4 is performed to its each pixel region.
In step S410, calculate first light intensity value in current pixel region.
In step S420, judge whether the first light intensity value of this pixel region is greater than the first predetermined Intensity threshold.
When step S420 judges that the first light intensity value of this pixel region is greater than the first predetermined Intensity threshold, this light-metering analytic process proceeds to step S430.
In step S430, using the new sensitive time of the half of the sensitive time of this pixel region as this pixel region.
When step S420 judges that the first light intensity value of this pixel region is not more than the first predetermined Intensity threshold, this light-metering analytic process proceeds to step S440.
In step S440, judge whether the first light intensity value of this pixel region is less than the second predetermined Intensity threshold, described second predetermined Intensity threshold is less than described first predetermined Intensity threshold.
When step S440 judges that the first light intensity value of this pixel region is less than the second predetermined Intensity threshold, this light-metering analytic process proceeds to step S450.
In step S450, using the new sensitive time of the twice of the sensitive time of this pixel region as this pixel region.
When step S440 judges that the first light intensity value of this pixel region is not less than the second predetermined Intensity threshold, namely, when the first light intensity value of this pixel region is between described first predetermined Intensity threshold and described second predetermined Intensity threshold, this light-metering analytic process proceeds to step S460.
In step S460, the sensitive time of this pixel region was remained unchanged as the new sensitive time of this pixel region.
After determining new sensitive time for each pixel region, gathering utilizes carry out photosensitive obtained preview image determined new sensitive time, and continue to each pixel region in gathered preview image repeat the light-metering analysis shown in Fig. 4 and sensitive time deterministic process, until the light intensity value of each pixel region is between described first predetermined Intensity threshold and described second predetermined Intensity threshold or reach minimum sensitive time or maximum sensitive time new sensitive time.
After determining sensitive time for each pixel region, the photosensitive control method according to the embodiment of the present invention proceeds to step S230.
In step S230, for described each pixel region, carry out photosensitive according to its corresponding sensitive time.
Then, can terminate in step S299 according to the photosensitive control method of the embodiment of the present invention.
In addition, according to the photosensitive control method of the embodiment of the present invention each pixel region was carried out according to its corresponding sensitive time photosensitive after, the brightness of each sub-pixel in photographic images can also be determined further.Particularly, each pixel region was carried out according to its corresponding sensitive time photosensitive after, the first brightness value determining this sub-pixel sensitive time that the quantity of electric charge (or capacitance voltage) that stores in electric capacity in each sub-pixel is corresponding to this sub-pixel can be utilized.More specifically, sensitive time that can be corresponding to this sub-pixel by the brightness value corresponding to the quantity of electric charge stored in electric capacity in each sub-pixel (or capacitance voltage) stores in memory together, and then utilizes the first brightness value determining stored charge amount and sensitive time this sub-pixel.
Fig. 5 A illustrates a kind of particular flow sheet of pixel intensity determining step in the photosensitive control method according to the embodiment of the present invention.
In step S510, for each sub-pixel, utilize photosensitive after the quantity of electric charge that stores in electric capacity in this sub-pixel calculate the second brightness value.
In step S520, for each sub-pixel, utilize the ratio of its second brightness value and its sensitive time as the first brightness value of this sub-pixel.
Particularly, after step S510, (not shown in Fig. 5 A) first the second brightness value of this calculated sub-pixel and this sub-pixel can also be stored in memory corresponding sensitive time in step S512, then in step S514, (not shown in Fig. 5 A) reads the second brightness value and the sensitive time of this sub-pixel more as required from memory.
Such as, at each R, G, the brightness value of B sub-pixel is represented by 8 bits and sensitive time is represented by 4 bits when, second brightness value of the first sub-pixel is 200 and first sub-pixel corresponding sensitive time was 2, second brightness value of the second sub-pixel is 150 and second sub-pixel corresponding sensitive time was 12, then can calculate: the first brightness value of the first sub-pixel be 200/2*15(can maximum sensitive time)=1500, first brightness value of the second sub-pixel is 150/12*15=187.5 ≈ 188, extend each R thus, G, 8 bits of the brightness value of B sub-pixel represent ability.In the case, the brightness value of each R, G, B sub-pixel can be represented that Capacity extension is 12 bits, that is, in photographic images, the ratio of maximum brightness and minimum brightness can from 2
8expand to 2
12.Here, in fact, for each sub-pixel, the ratio of its second brightness value and its sensitive time is calculated, and using this ratio and the product of maximum available sensitive time the first brightness value as this sub-pixel.
Fig. 5 B illustrates the another kind of particular flow sheet of pixel intensity determining step in the photosensitive control method according to the embodiment of the present invention.
In step S560, for each sub-pixel, utilize photosensitive after the quantity of electric charge that stores in electric capacity in this sub-pixel calculate the second brightness value.
In step S570, determine the maximum sensitive time in all sub-pixels.
In step S580, for each sub-pixel, calculate the ratio of maximum sensitive time and its sensitive time, and the result be multiplied with calculated ratio by the second read brightness value is as described first brightness value of this sub-pixel.
Particularly, after step s 560, (not shown in Fig. 5 B) first the second brightness value of this calculated sub-pixel and this sub-pixel can also be stored in memory corresponding sensitive time in step S562, then in step S564, (not shown in Fig. 5 B) reads the second brightness value and the sensitive time of this sub-pixel more as required from memory.
Such as, at each R, G, the brightness value of B sub-pixel is represented by 8 bits and sensitive time is represented by 4 bits when, second brightness value of the first sub-pixel is 200 and first sub-pixel corresponding sensitive time was 2, second brightness value of the second sub-pixel is 150 and second sub-pixel corresponding sensitive time was 12, the maximum sensitive time of each sub-pixel is 12, then can calculate: the ratio of the sensitive time of maximum sensitive time and the first sub-pixel is 6, the ratio of the sensitive time of maximum sensitive time and the second sub-pixel is 1, first brightness value of the first sub-pixel is 200 × 6=1200, first brightness value of the second sub-pixel is 150 × 1=150, extend each R thus, G, 8 bits of the brightness value of B sub-pixel represent ability.In the case, the brightness value of each R, G, B sub-pixel can be represented that Capacity extension is 12 bits, that is, in photographic images, the ratio of maximum brightness and minimum brightness can from 2
8expand to 2
12.
According to the embodiment of the present invention, pixel region can be one-row pixels, a row pixel, pixel, the pixel region be made up of several neighbors or the pixel region be made up of multiple sub-pixels of light intensity value in preset range.As required, those skilled in the art can utilize multiple sub-pixel or pixel to form pixel region according to other choice criteria.
Fig. 6 illustrates the schematic diagram of the CMOS photo-process according to the embodiment of the present invention.
As shown in Figure 6, according in the CMOS photo-process of the embodiment of the present invention, control the sensitive time of each sub-pixel, namely control the charging interval of electric capacity in each sub-pixel.
In photo-process, the sensitive time of each pixel region calculated according to the photosensitive control method described above with reference to Fig. 2-4 carries out photosensitive, particularly, increase the control switch of the sensitive time for controlling each sub-pixel, for each sub-pixel, within its sensitive time, this control switch conducting is to charge to the electric capacity in this sub-pixel by photo-process, and this control switch disconnects with the charging terminated this electric capacity after its sensitive time.
Control switch module shown in Figure 6 can comprise the control switch being respectively used to each sub-pixel in a line.Should be appreciated that, control switch can control a sub-pixel, pixel, the photo-process of unit that is made up of at least two neighbors.
Fig. 7 illustrates the schematic block diagram of the sensitive control device 700 according to the embodiment of the present invention.
Sensitive control device 700 according to the embodiment of the present invention comprises: image analysis part 710, sensitive time calculating unit 720, sensitive time control assembly 740 and brightness value determining means 730.
The preview image of described collection, for carrying out light-metering analysis to the preview image of the scene gathered, is divided into multiple pixel region by image analysis part 710, calculates light intensity value for each pixel region in described multiple pixel region.
Sensitive time, calculating unit 720 was for the preview image for described collection, according to the light intensity value of calculated described multiple pixel region, calculated described each pixel region corresponding sensitive time.
Sensitive time, control assembly 730 was for for described each pixel region, carried out photosensitive according to its corresponding sensitive time to it.
Brightness value determining means 740 for for each sub-pixel in each pixel in each pixel region, utilize photosensitive after the quantity of electric charge that stores in electric capacity in this sub-pixel and the first brightness value determining this sub-pixel sensitive time.
As shown in Figure 8, show according to the image analysis part 710 in the sensitive control device of the embodiment of the present invention and sensitive time calculating unit 720 the first schematic block diagram.
Image analysis part 710 can comprise the first light intensity calculating unit 7110 and the second light intensity calculating unit 7120.
Described first light intensity calculating unit 7110 calculates and is utilizing the first light intensity value carrying out each pixel region in the first photosensitive obtained preview image the first sensitive time.
Described second light intensity calculating unit 7120 calculates and is utilizing the second light intensity value carrying out each pixel region in the second photosensitive obtained preview image the second sensitive time, and wherein the second sensitive time is longer than the first sensitive time.
Such as, described second sensitive time is longer than the first sensitive time, and described second sensitive time is acquiescence sensitive time, and described first sensitive time is the sensitive time short and longer than minimum sensitive time than acquiescence sensitive time.In the case, sensitive time calculating unit 720 can comprise first threshold comparing unit 7210, Second Threshold comparing unit 7220 and sensitive time setting parts 7230.
First light intensity value and the first predetermined Intensity threshold compare by described first threshold comparing unit 7210, when described first threshold comparing unit 7210 judges that the first light intensity value is greater than the first predetermined Intensity threshold, the sensitive time of this pixel region was set to be less than for the first sensitive time and was more than or equal to minimum sensitive time by setting parts 7230 described sensitive time.
When described first threshold comparing unit 7210 judges that the first light intensity value is not more than the first predetermined Intensity threshold, second light intensity value also compares with the first predetermined Intensity threshold by described first threshold comparing unit 7210, when described first threshold comparing unit 7210 judges that the second light intensity value is greater than the first predetermined Intensity threshold, the sensitive time of this pixel region was set to be less than described second sensitive time and was more than or equal to described minimum sensitive time by setting parts 7230 described sensitive time.
When described first threshold comparing unit 7210 judges that the second light intensity value is not more than the first predetermined Intensity threshold, second light intensity value and the second predetermined Intensity threshold compare by described Second Threshold comparing unit 7220, second predetermined Intensity threshold is less than the first predetermined Intensity threshold, when described Second Threshold comparing unit 7220 judges that the second light intensity value is less than the second predetermined Intensity threshold, the sensitive time of this pixel was set to be greater than for the second sensitive time and was less than or equal to maximum sensitive time by setting parts 7230 described sensitive time.
When described Second Threshold comparing unit 7220 judges that the second light intensity value is not less than the second predetermined Intensity threshold, first light intensity value and the second predetermined Intensity threshold also compare by described Second Threshold comparing unit 7220, when described Second Threshold comparing unit 7220 judges that the first light intensity value is less than the second predetermined Intensity threshold, the sensitive time of this pixel was set to be greater than for the first sensitive time and was less than or equal to maximum sensitive time by setting parts 7230 described sensitive time.
When described Second Threshold comparing unit 7220 judges that the first light intensity value is not less than the second predetermined Intensity threshold, described sensitive time, the sensitive time of this pixel region 7230 was set to described second sensitive time or described first sensitive time by setting parts.
In addition, as shown in Figure 9, the second schematic block diagram according to the image analysis part 710 in the sensitive control device of the embodiment of the present invention is shown.
Image analysis part 710 can comprise the first light intensity value calculating unit 7160.
Sensitive time calculating unit 720 can comprise first threshold comparing unit 7260, Second Threshold comparing unit 7270, sensitive time setting parts 7280.
Described first light intensity value calculating unit 7160 calculates the first light intensity value of each pixel region in the preview image gathered.
First light intensity value of each pixel region and the first predetermined Intensity threshold compare by described first threshold comparing unit 7260.First light intensity value of each pixel region and the second predetermined Intensity threshold compare by described Second Threshold comparing unit 7270, and described second predetermined Intensity threshold is less than described first predetermined Intensity threshold.
When described first threshold comparing unit 7260 judges that the first light intensity value of this pixel region is greater than the first predetermined Intensity threshold, described sensitive time, setting parts 7280 was using the new sensitive time of the half of the sensitive time of this pixel region as this pixel region.
When described Second Threshold comparing unit 7270 judges that the first light intensity value of this pixel region is less than the second predetermined Intensity threshold, described sensitive time, setting parts 7280 was using the new sensitive time of the twice of the sensitive time of this pixel region as this pixel region.
When described first threshold comparing unit 7260 judges that the first light intensity value of this pixel region is not more than the first predetermined Intensity threshold and described Second Threshold comparing unit 7270 judges that the first light intensity value of this pixel region is not less than the second predetermined Intensity threshold, namely, when the first light intensity value of this pixel region is between described first predetermined Intensity threshold and described second predetermined Intensity threshold, described sensitive time, the sensitive time of this pixel region 7280 remained unchanged as the new sensitive time of this pixel region by setting parts.
Figure 10 A illustrates the first concrete block diagram according to the brightness value determining means 730 in the sensitive control device of the embodiment of the present invention.
As shown in Figure 10 A, brightness value determining means 730 comprises brightness value calculating unit 7310 and brightness value scaling member 7320.
Brightness value calculating unit 7310 for for each sub-pixel, utilize photosensitive after the quantity of electric charge that stores in electric capacity in this sub-pixel calculate the second brightness value.
Brightness value scaling member 7320 for for each sub-pixel, using the second brightness value of this sub-pixel and the ratio of its sensitive time described first brightness value as this sub-pixel.
Although not shown in Fig. 10, brightness value determining means 730 can also comprise data storage part 7330 and digital independent parts 7340.Data storage part 7330 is for storing the second brightness value of this calculated sub-pixel and this sub-pixel in memory corresponding sensitive time.Digital independent parts 7340 for reading the second brightness value and the sensitive time of this sub-pixel as required from memory.
Figure 10 B illustrates the second concrete block diagram according to the brightness value determining means 730 in the sensitive control device of the embodiment of the present invention.
As shown in Figure 10 B, brightness value determining means 730 comprises brightness value calculating unit 7360 and brightness value scaling member 7370.
Brightness value calculating unit 7360 for for each sub-pixel, utilize photosensitive after the quantity of electric charge that stores in electric capacity in this sub-pixel calculate the second brightness value.
Brightness value scaling member 7370 is for determining the maximum sensitive time in all sub-pixels, and for each sub-pixel, calculate the ratio of maximum sensitive time and its sensitive time, the result be multiplied with calculated ratio by the second brightness value of this sub-pixel is as described first brightness value of this sub-pixel.
Although not shown in Fig. 10, brightness value determining means 730 can also comprise data storage part 7380 and digital independent parts 7390.
Data storage part 7380 is for storing the second brightness value of this calculated sub-pixel and this sub-pixel in memory corresponding sensitive time.Digital independent parts 7390 for reading the second brightness value and the sensitive time of this sub-pixel as required from memory.
Sensitive time, control assembly 740 was capacitor charging time control assembly, it can comprise multiple control switch, for each sub-pixel, within its sensitive time, the corresponding control switch conducting of this sub-pixel is to charge to the electric capacity in this sub-pixel by photo-process, and this control switch disconnects with the charging terminated this electric capacity after its sensitive time.
Should be appreciated that, control switch can control a sub-pixel, pixel, the photo-process of unit that is made up of at least two neighbors.
According to the embodiment of the present invention, can according to the sensitive time of each pixel region of light intensity adjustment CMOS of regional in photographed scene, photosensitive by utilizing carry out different sensitive times for each pixel region, effectively can avoid the problem of overexposure or the under-exposure that may occur when applying same exposure parameter and carrying out photographed scene.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required hardware platform by means of software and realize, and can certainly all be implemented by software or hardware.Based on such understanding, what technical scheme of the present invention contributed to background technology can embody with the form of software product in whole or in part, this computer software product can be stored in storage medium, as ROM/RAM, disk, CD etc., comprise some instructions and perform method described in some part of each embodiment of the present invention or embodiment in order to make a computer equipment.
Each embodiment of the present invention is described in detail above.But, it should be appreciated by those skilled in the art that without departing from the principles and spirit of the present invention, various amendment can be carried out to these embodiments, combination or sub-portfolio, and such amendment should fall within the scope of the present invention.
Claims (16)
1. a photosensitive control method, comprising:
Light-metering analysis is carried out to the preview image of gathered scene, the preview image of described collection is divided into multiple pixel region, light intensity value is calculated for each pixel region in described multiple pixel region;
For the preview image of described collection, according to the light intensity value of calculated described multiple pixel region, calculate described each pixel region corresponding sensitive time; And
For described each pixel region, carry out photosensitive according to its corresponding sensitive time.
2. photosensitive control method as claimed in claim 1, also comprises: for each sub-pixel in each pixel in each pixel region, utilize photosensitive after the quantity of electric charge that stores in electric capacity in this sub-pixel and the first brightness value determining this sub-pixel sensitive time.
3. photosensitive control method as claimed in claim 2, wherein, for each sub-pixel utilize photosensitive after the quantity of electric charge that stores in electric capacity in this sub-pixel and determine that the first brightness value of this sub-pixel comprises sensitive time:
For each sub-pixel, utilize photosensitive after the quantity of electric charge that stores in electric capacity in this sub-pixel calculate the second brightness value;
For each pixel, utilize the ratio of its second brightness value and its sensitive time as the first brightness value of this sub-pixel.
4. photosensitive control method as claimed in claim 2, wherein, for each sub-pixel utilize photosensitive after the quantity of electric charge that stores in electric capacity in this sub-pixel and determine that the first brightness value of this sub-pixel comprises sensitive time:
For each sub-pixel, utilize photosensitive after the quantity of electric charge that stores in electric capacity in this sub-pixel calculate the second brightness value;
Determine the maximum sensitive time in all sub-pixels; And
For each sub-pixel, calculate the ratio of maximum sensitive time and its sensitive time, and the result be multiplied with calculated ratio by its second brightness value is as described first brightness value of this sub-pixel.
5. photosensitive control method as claimed in claim 1, wherein, pixel region be one-row pixels, a row pixel, pixel, the pixel region be made up of several neighbors or the pixel region that is made up of multiple sub-pixels of light intensity value in preset range.
6. photosensitive control method as claimed in claim 1, wherein, light-metering analysis is carried out to gathered preview image and comprises:
Calculate and utilize the first light intensity value carrying out each pixel region in the first photosensitive obtained preview image the first sensitive time; And
Calculate and utilize the second light intensity value carrying out each pixel region in the second photosensitive obtained preview image the second sensitive time, wherein the second sensitive time is longer than the first sensitive time.
7. photosensitive control method as claimed in claim 6, wherein, described second sensitive time is acquiescence sensitive time, for gathered preview image, calculate each pixel region according to the light intensity value of each calculated pixel region to comprise corresponding sensitive time: for each pixel region
Judge whether the first light intensity value is greater than the first predetermined Intensity threshold, when judgement first light intensity value is greater than the first predetermined Intensity threshold, the sensitive time of this pixel region is set to be less than for the first sensitive time and is more than or equal to minimum sensitive time;
When judgement first light intensity value is not more than the first predetermined Intensity threshold, judge whether the second light intensity value is greater than the first predetermined Intensity threshold, and when judgement second light intensity value is greater than the first predetermined Intensity threshold, the sensitive time of this pixel region is set to be less than described second sensitive time and be more than or equal to described minimum sensitive time;
When judgement second light intensity value is not more than the first predetermined Intensity threshold, judge whether the second light intensity value is less than the second predetermined Intensity threshold, second predetermined Intensity threshold is less than the first predetermined Intensity threshold, and when judgement second light intensity value is less than the second predetermined Intensity threshold, be set to the sensitive time of this pixel be greater than for the second sensitive time and be less than or equal to maximum sensitive time;
When judgement second light intensity value is not less than the second predetermined Intensity threshold, judge whether the first light intensity value is less than the second predetermined Intensity threshold, and when judgement first light intensity value is less than the second predetermined Intensity threshold, the sensitive time of this pixel region is set to be greater than described first sensitive time and be less than or equal to described maximum sensitive time; And
When judgement first light intensity value is not less than the second predetermined Intensity threshold, is set to described second sensitive time or described first sensitive time the sensitive time of pixel region.
8. photosensitive control method as claimed in claim 1, wherein, to it, carried out according to its corresponding sensitive time photosensitive comprising for each pixel region:
For each sub-pixel in each pixel region, to the capacitor charging in this sub-pixel during corresponding sensitive time, and stop its capacitor charging after exceeding corresponding sensitive time.
9. a sensitive control device, comprising:
Image analysis part, for carrying out light-metering analysis to the preview image of the scene gathered, is divided into multiple pixel region by the preview image of described collection, calculates light intensity value for each pixel region in described multiple pixel region;
Sensitive time, calculating unit, for the preview image for described collection, according to the light intensity value of calculated described multiple pixel region, calculated described each pixel region corresponding sensitive time; And
Sensitive time, control assembly, for for described each pixel region, carried out photosensitive according to its corresponding sensitive time to it.
10. sensitive control device as claimed in claim 9, also comprise: brightness value determining means, for for each sub-pixel in each pixel in each pixel region, utilize photosensitive after the quantity of electric charge that stores in electric capacity in this sub-pixel and the first brightness value determining this sub-pixel sensitive time.
11. sensitive control devices as claimed in claim 10, wherein, described brightness value determining means comprises:
Brightness value calculating unit, for for each sub-pixel, utilize photosensitive after the quantity of electric charge that stores in electric capacity in this sub-pixel calculate the second brightness value; And
Brightness value scaling member, for for each sub-pixel, using its second brightness value and the ratio of its sensitive time described first brightness value as this sub-pixel.
12. sensitive control devices as claimed in claim 10, wherein, described brightness value determining means comprises:
Brightness value calculating unit, for for each sub-pixel, utilize photosensitive after the quantity of electric charge that stores in electric capacity in this sub-pixel calculate the second brightness value; And
Brightness value scaling member, for determining the maximum sensitive time in all sub-pixels, and for each sub-pixel, calculate the ratio of maximum sensitive time and its sensitive time, the result be multiplied with calculated ratio by its second brightness value is as described first brightness value of this sub-pixel.
13. sensitive control devices as claimed in claim 9, wherein, pixel region be one-row pixels, a row pixel, pixel, the pixel region be made up of several neighbors or the pixel region that is made up of multiple sub-pixels of light intensity value in preset range.
14. sensitive control devices as claimed in claim 9, wherein, described image analysis part comprises:
First light intensity calculating unit, its calculating is utilizing the first light intensity value carrying out each pixel region in the first photosensitive obtained preview image the first sensitive time; And
Second light intensity calculating unit, its calculating is utilizing the second light intensity value carrying out each pixel region in the second photosensitive obtained preview image the second sensitive time, and wherein the second sensitive time is longer than the first sensitive time.
15. sensitive control devices as claimed in claim 14, wherein, described second sensitive time is acquiescence sensitive time, described sensitive time calculating unit comprise first threshold comparing unit, Second Threshold comparing unit and sensitive time setting parts;
Wherein, first light intensity value and the first predetermined Intensity threshold compare by described first threshold comparing unit, when described first threshold comparing unit judges that the first light intensity value is greater than the first predetermined Intensity threshold, the sensitive time of this pixel region was set to be less than for the first sensitive time and was more than or equal to minimum sensitive time by setting parts described sensitive time;
When described first threshold comparing unit judges that the first light intensity value is not more than the first predetermined Intensity threshold, second light intensity value also compares with the first predetermined Intensity threshold by described first threshold comparing unit, when described first threshold comparing unit judges that the second light intensity value is greater than the first predetermined Intensity threshold, described sensitive time, the sensitive time of this pixel region was set to be less than described second sensitive time and be more than or equal to described minimum sensitive time by setting parts;
When described first threshold comparing unit judges that the second light intensity value is not more than the first predetermined Intensity threshold, second light intensity value and the second predetermined Intensity threshold compare by described Second Threshold comparing unit, second predetermined Intensity threshold is less than the first predetermined Intensity threshold, when described Second Threshold comparing unit judges that the second light intensity value is less than the second predetermined Intensity threshold, the sensitive time of this pixel was set to be greater than for the second sensitive time and was less than or equal to maximum sensitive time by setting parts described sensitive time;
When described Second Threshold comparing unit judges that the second light intensity value is not less than the second predetermined Intensity threshold, also the first light intensity value and the second predetermined Intensity threshold are compared at described Second Threshold comparing unit, when described Second Threshold comparing unit judges that the first light intensity value is less than the second predetermined Intensity threshold, the sensitive time of this pixel was set to be greater than for the first sensitive time and was less than or equal to maximum sensitive time by setting parts described sensitive time; And
When described Second Threshold comparing unit judges that the first light intensity value is not less than the second predetermined Intensity threshold, described sensitive time, the sensitive time of this pixel region was set to described second sensitive time or described first sensitive time by setting parts.
16. sensitive control devices as claimed in claim 9, wherein, sensitive time, control assembly was capacitor charging time control assembly, it is for each sub-pixel in each pixel region, to the capacitor charging in this sub-pixel during corresponding sensitive time, and stop its capacitor charging after exceeding corresponding sensitive time.
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