CN110891147A - Video recording device and video computing method - Google Patents

Abstract

The invention provides an image recording device and an image operation method, wherein a tone adjusting part is provided with a plurality of tone mapping adjusting curves, and an automatic exposure part compares the brightness of an original dynamic image to obtain the closest brightness interval, so that the tone adjusting part uses the corresponding tone mapping adjusting curve according to the result of selecting the brightness interval by the automatic exposure part to adjust the brightness of the original dynamic image.

Description

Video recording device and video computing method

technical field

The present disclosure relates to an image recording device and an image computing method, and in particular, to an image recording device and an image computing method that can apply different tone mapping adjustment curves according to different luminances to obtain optimal dynamic image quality.

Background technique

In the current technology, video recording devices, such as cameras, video recorders, etc., are used to acquire dynamic images (such as videos). Video recording devices usually have the function of High Dynamic Range (HDR), which allows a larger dynamic range between the brightest and darkest areas in the image, so that the video recording device can be used for taking pictures and dynamic video recording. The color performance of the image presented is better.

Traditional video recording devices can achieve high dynamic range of images by one of two methods, namely interlaced high dynamic range (Interlaced video HDR) and zigzag high dynamic range (Zig Zag videoHDR, ZZHDR), where Z Glyph high dynamic range images are widely used in video recording devices for reasons such as faster output image speed and no reduction in size.

After acquiring the original moving image, a conventional video recording device utilizing a zig-zag high dynamic range image adjusts and compensates the brightness of the original moving image with a single preset adjustment value to output a compensated moving image. However, because of this traditional video recording device that uses Z-shaped high dynamic range images, no matter what brightness the original moving image is acquired, it can only apply the same adjustment value to adjust the brightness of the original moving image, which makes the traditional use of Z-shaped high dynamic range images. The quality of the adjusted video output by the video recording device with the glyph high dynamic range image is poor. For example, when the brightness of the original video is adjusted with a single adjustment value, the low-brightness area in the original video can be adjusted to increase the brightness to an appropriate level. However, the high-brightness area in the original moving image can only use the same adjustment value and the brightness continues to rise, making the high-brightness area in the original moving image overexposed. The video quality of the adjusted video output by the video recording device of the range video is poor.

Therefore, how to develop an image recording device and an image computing method that overcomes the above shortcomings is an urgent need at present.

SUMMARY OF THE INVENTION

The purpose of the present disclosure is to provide an image recording device and an image computing method, wherein a plurality of different tone mapping adjustment curves are preset, whereby a plurality of tone mapping adjustment curves can be selected for different image information of the original moving image Adjust the brightness of the original moving image by using the corresponding tone-mapping adjustment curve in , so that the adjusted moving image has better moving image quality.

To achieve the above objective, an embodiment of the present disclosure provides an image recording device including a detection module and an image signal output module. The detection module includes a detection part, a data statistics part and a tone adjustment part. The detection part acquires the original moving image according to the exposure parameter, and outputs the image information of the original moving image. The data statistics unit is connected to the detection unit to receive the image information of the original moving image, and collects the image information of the original moving image to output the image information. The tone adjustment part is connected to the detection part, and has a plurality of preset different tone mapping adjustment curves, the tone adjustment part receives the image information of the original moving image, and uses one of the tone mapping adjustment curves of the multiple tone adjustment curves The mapping adjustment curve adjusts the brightness of the original motion picture to adjust the image information of the motion picture according to the adjusted original motion picture output. The image signal output module includes an automatic exposure part and a dynamic contrast adjustment part. The automatic exposure part is connected with the data statistics part, the detection part and the tone adjustment part, and a plurality of brightness intervals are preset. The automatic exposure part receives the image information of the original moving image from the data statistics part, and according to the image information of the original moving image The first command is output to the detection unit, so that the detection unit adjusts the exposure parameters according to the first command. The automatic exposure unit also compares the closest brightness interval from the plurality of brightness intervals according to the image information of the original moving image, and determines the brightness interval according to the brightness interval. The second command is output to the tone adjustment unit, so that the tone adjustment unit selects the corresponding tone mapping adjustment curve according to the second instruction to adjust the brightness of the original moving image, so as to output the image information of the adjusted moving image. The dynamic contrast adjustment part is connected with the tone adjustment part, and is used for receiving the image information for adjusting the dynamic image transmitted from the tone adjustment part, so as to output the adjusted dynamic image correspondingly.

In order to achieve the above object, an embodiment of the present disclosure is to provide an image computing method, which is applied to an image recording device. The image recording device includes a detection module and an image signal output module, and the detection module includes a detection unit, a data statistics unit, and a tone adjustment unit. The calibration part, the tone calibration part has a plurality of preset different tone mapping adjustment curves, the image signal output module includes an automatic exposure part and a dynamic contrast adjustment part, the automatic exposure part presets multiple brightness intervals, and the image calculation The method includes the following steps: step (a) the detection part acquires the original moving image according to the exposure parameter, and outputs the image information of the original moving image. Step (b) The data statistics unit receives the image information of the original moving image, and collects the image information to output the original moving image. Step (c) The automatic exposure part receives the image information of the original moving image from the data statistics part, and outputs a first instruction to the detection part according to the image information of the original moving image, so that the detection part adjusts the exposure parameters according to the first instruction, and the automatic exposure part also According to the image information of the original moving image, the closest luminance interval is compared among the plurality of luminance intervals, and according to the luminance interval, a second command is output to the tone adjustment unit, so that the tone adjustment unit selects the One of the tone-mapping adjustment curves of the tone-mapping adjustment curves adjusts the brightness of the original moving image to output image information of the adjusted moving image. In step (d), the dynamic contrast adjustment unit receives the image information of the adjusted dynamic image transmitted from the tone adjustment unit, and outputs the adjusted dynamic image correspondingly.

Description of drawings

FIG. 1 is a circuit structure diagram of a video recording device according to a preferred embodiment of the disclosure.

FIG. 2A is a graph of a first tone mapping adjustment curve preset by the tone adjustment unit shown in FIG. 1 .

FIG. 2B is a graph of a second tone mapping adjustment curve preset by the tone adjustment unit shown in FIG. 1 .

FIG. 3A is a graph of a first tone mapping adjustment curve preset by the tone adjustment unit shown in FIG. 1 .

FIG. 3B is a graph of a second tone mapping adjustment curve preset by the tone adjustment unit shown in FIG. 1 .

FIG. 3C is a graph of a third tone mapping adjustment curve preset by the tone adjustment unit shown in FIG. 1 .

FIG. 4 is a schematic flowchart of an image computing method applied to the image recording device shown in FIG. 1 .

Symbol Description

1: Video recording device

2: Detection module

21: Detection Department

22: Statistics Department

23: Tone Adjustment Section

3: Video signal output module

31: Auto Exposure Section

32: Dynamic Contrast Adjustment Section

S1～S4: Steps

Detailed ways

Some typical embodiments that embody the features and advantages of the present disclosure will be described in detail in the description that follows. It should be understood that the present disclosure can have various changes in different embodiments without departing from the scope of the present disclosure, and the descriptions and drawings therein are for illustrative purposes in nature, rather than limiting the present disclosure. .

Please refer to FIG. 1 , which is a circuit structure diagram of a video recording apparatus according to a preferred embodiment of the present disclosure. As shown in the figure, the video recording device 1 of this embodiment can be, but is not limited to, applied to zigzag high dynamic range images, and includes a detection module 2 and an image signal output module 3 . The detection module 2 includes a detection unit 21 , a data statistics unit 22 and a tone adjustment unit 23 . The detection unit 21 acquires the original moving image according to an exposure parameter (eg, aperture value, shutter value, or sensitivity (International Organization for Standardization, ISO), etc.), and outputs image information of the original moving image. The data statistics unit 22 is connected to the detection unit 21 for receiving the image information of the original moving image provided by the detection unit 21 and statistically outputting the image information of the original moving image, such as brightness information of the original moving image. The tone adjustment unit 23 is connected to the detection unit 21, and has a plurality of preset different tone mapping adjustment curves. The tone adjustment unit 23 further receives the image information of the original moving image provided by the detection unit 21, and uses the multiple tone mapping adjustment curves. One of the tone mapping adjustment curves adjusts the brightness of the original moving image, and then adjusts the image information of the moving image according to the adjusted original moving image output.

The image signal output module 3 includes an automatic exposure unit 31 and a dynamic contrast adjustment unit 32 . The automatic exposure part 31 is connected with the data statistics part 22, the detection part 21 and the tone adjustment part 23, and is preset with a plurality of different brightness intervals, wherein the number of brightness intervals corresponds to the number of tone mapping adjustment curves, And each luminance interval corresponds to a tone mapping adjustment curve that is different from other luminance intervals. The automatic exposure unit 31 receives the image information of the original moving image provided by the data statistics unit 22, and outputs a first command to the detection unit 21 according to the image information of the original moving image, so that the detection unit 21 adjusts the method for obtaining the original moving image according to the first instruction. Exposure parameters of the moving image, in addition, the automatic exposure unit 31 can also compare the closest brightness interval from a plurality of brightness intervals according to the image information of the original moving image, and output the second command to the tone adjustment according to the brightness interval part 23 , so that the tone adjustment part 23 selects the corresponding tone mapping adjustment curve from among the plurality of tone mapping adjustment curves according to the second instruction to adjust the brightness of the original moving image, so as to output the image information of the adjusted moving image. The dynamic contrast adjustment unit 32 is connected to the tone adjustment unit 23 for receiving the image information for adjusting the moving image provided by the tone adjustment unit 23 , and correspondingly outputting the adjusted moving image according to the image information of the adjusted moving image.

In the above embodiment, the curvature of the tone mapping adjustment curve is the ratio of the brightness of the original moving image to the brightness of the adjusted moving image, and the setting of the ratio of each tone mapping adjustment curve is produced in the video recording device 1 . Before, after converting the original moving image into an adjusted moving image under different brightness conditions, set it according to the quality of the adjusted moving image that can actually be accepted by the user, and it has been preset in the tone adjustment section. within 23.

Please refer to FIG. 2A and FIG. 2B , wherein FIG. 2A is a graph of a first tone mapping adjustment curve preset by the tone alignment unit shown in FIG. 1 , and FIG. 2B is a preset tone alignment unit shown in FIG. 1 . A graph of the second tonemap adjustment curve. In some embodiments, as shown in FIGS. 2A and 2B , the number of tone mapping adjustment curves is actually two, namely the first tone mapping adjustment curve (as shown in FIG. 2A ) and the second tone mapping adjustment curve (as shown in FIG. 2A ). 2B), wherein the X-axis of the first tone-mapping adjustment curve and the second tone-mapping adjustment curve are the brightness of the original moving image, and the Y-axis of the first tone-mapping adjustment curve and the second tone-mapping adjustment curve are the adjusted moving images, respectively It can be seen from FIGS. 2A and 2B that the curvature of the first tone-mapping adjustment curve is smaller than the curvature of the second tone-mapping adjustment curve.

The corresponding multiple tone-mapping adjustment curves actually include a first tone-mapping adjustment curve and a second tone-mapping adjustment curve, so the multiple brightness intervals also include a first brightness interval and a second brightness interval, and the first brightness interval may be but Not limited to the sensitivity greater than 800, the second brightness interval may be, but not limited to, the sensitivity less than or equal to 800. When the automatic exposure unit 31 selects the first brightness interval according to the image information of the original moving image, the tone adjustment unit 23 selects the first tone mapping adjustment curve according to the second instruction to adjust the brightness of the original moving image. 31 When the second brightness interval is selected according to the image information of the original moving image, the tone adjustment unit 23 selects the second tone mapping adjustment curve according to the second instruction to adjust the brightness of the original moving image.

Please refer to FIGS. 3A , 3B and 3C, wherein FIG. 3A is a graph of the first tone mapping adjustment curve preset by the tone adjustment unit shown in FIG. 1 , and FIG. 3B is the tone adjustment unit shown in FIG. 1 . A graph of the preset second tone mapping adjustment curve, FIG. 3C is a graph of the third tone mapping adjustment curve preset by the tone adjustment part shown in FIG. 1 . In some embodiments, the number of tone mapping adjustment curves is not limited to two, and the number of tone mapping adjustment curves may include three tone mapping adjustment curves as shown in FIG. 3A, FIG. 3B and FIG. The tone mapping adjustment curve (as shown in FIG. 3A ), the second tone mapping adjustment curve (as shown in FIG. 3B ) and the third tone mapping adjustment curve (as shown in FIG. 3C ), wherein the first tone mapping adjustment curve, the second tone mapping adjustment curve and the third tone mapping adjustment curve The X-axis of the three tone mapping adjustment curve is the brightness of the original moving image, while the Y-axis of the first tone mapping adjustment curve, the second tone mapping adjustment curve and the third tone mapping adjustment curve are the brightness of the adjusted moving image respectively. 3A, 3B and 3C show that the curvature of the first tone mapping adjustment curve is smaller than that of the second tone mapping adjustment curve, and the curvature of the second tone mapping adjustment curve is smaller than that of the third tone mapping adjustment curve.

The corresponding multiple tone mapping adjustment curves actually include the first tone mapping adjustment curve, the second tone mapping adjustment curve and the third tone mapping adjustment curve, so the multiple luminance intervals also include the first luminance interval, the second luminance interval and the The third brightness interval, the first brightness interval can be but not limited to the sensitivity greater than 800, the second brightness interval can be but not limited to the sensitivity less than or equal to 800 and greater than 400, the third brightness interval can be but not limited to Sensitivity is less than or equal to 400. When the automatic exposure unit 31 selects the first brightness interval according to the image information of the original moving image, the tone adjustment unit 23 selects the first tone mapping adjustment curve according to the second instruction to adjust the brightness of the original moving image. 31 When the second brightness interval is selected according to the image information of the original moving image, the tone adjustment section 23 selects the second tone mapping adjustment curve according to the second instruction to adjust the brightness of the original moving image. When the image information of the image selects the third brightness interval, the tone adjustment unit 23 selects the third tone mapping adjustment curve according to the second instruction to adjust the brightness of the original moving image.

Of course, the number of tone mapping adjustment curves and brightness intervals is not limited to the above-mentioned embodiment, and may include more than four, which will not be described herein again.

Please refer to FIG. 4 in conjunction with FIG. 1 , wherein FIG. 4 is a schematic flowchart of an image computing method applied to the image recording device shown in FIG. 1 . As shown in the figure, step S1 is first performed, and the detection unit 21 acquires the original moving image according to the exposure parameter, and outputs the image information of the original moving image. Then, step S2 is executed, and the data statistics unit 22 receives the image information of the original moving image, and collects the image information to output the original moving image. Then, step S3 is executed, the automatic exposure unit 31 receives the image information of the original moving image from the data statistics unit 22, and outputs a first command to the detection unit 21 according to the image information of the original moving image, so that the detection unit 21 adjusts the exposure according to the first instruction parameter, the automatic exposure unit 31 also compares the closest luminance interval from a plurality of luminance intervals according to the image information of the original moving image, and outputs a second command to the hue adjustment unit 23 according to the luminance interval to adjust the hue The section 23 selects one tone-mapping adjustment curve among the plurality of tone-mapping adjustment curves to adjust the brightness of the original moving image according to the second instruction, so as to output image information of the adjusted moving image. Finally, step S4 is executed, and the dynamic contrast adjustment unit 32 receives the image information of the adjusted moving image transmitted from the tone adjustment unit 23 to output the adjusted moving image accordingly.

In summary, the present disclosure provides an image recording device and an image computing method, wherein the tone adjustment unit has a plurality of tone mapping adjustment curves, and the automatic exposure unit compares the closest brightness interval according to the brightness of the original moving image , so that the tone adjustment part uses the corresponding tone mapping adjustment curve according to the result of the automatic exposure part selecting the brightness interval to adjust the brightness of the original moving image. Therefore, the image recording device and the image computing method of the present disclosure actually depend on the difference of the original moving image. Different tone mapping adjustment curves are used to adjust the brightness of the original moving image. Therefore, compared to traditional video recording devices, regardless of the brightness of the original moving image, the same adjustment value is used to adjust the original moving image. Brightness, the video recording device of the present disclosure can perform brightness adjustment for original moving images with different brightness, so that the output adjusted moving images can have good moving image quality.

Claims (8)

1. An image recording apparatus, comprising:

a detection module, comprising:

a detection part for obtaining an original dynamic image according to an exposure parameter and outputting image information of the original dynamic image;

a data statistic part connected with the detection part to receive the image information of the original dynamic image and to count to output the image information of the original dynamic image;

a tone adjusting part connected with the detecting part and having a plurality of different tone mapping adjusting curves, wherein the tone adjusting part receives the image information of the original dynamic image and adjusts the brightness of the original dynamic image by using one of the tone mapping adjusting curves so as to output the image information of an adjusted dynamic image according to the adjusted original dynamic image; and

an image signal output module, comprising:

an automatic exposure part, which is connected with the data statistics part, the detection part and the tone adjustment part and is preset with a plurality of brightness intervals, wherein the automatic exposure part receives the image information of the original dynamic image from the data statistics part and outputs a first instruction to the detection part according to the image information of the original dynamic image, so that the detection part adjusts the exposure parameter according to the first instruction, the automatic exposure part also compares the closest brightness interval from the plurality of brightness intervals according to the image information of the original dynamic image and outputs a second instruction to the tone adjustment part according to the brightness interval, and the tone adjustment part selects the corresponding tone mapping adjustment curve according to the second instruction to adjust the brightness of the original dynamic image so as to output the image information of the adjusted dynamic image;

and the dynamic contrast adjusting part is connected with the tone adjusting part and used for receiving the image information of the adjusted dynamic image transmitted by the tone adjusting part so as to correspondingly output the adjusted dynamic image.

2. The image recording apparatus of claim 1, wherein the curvature of the tone mapping adjustment curve is a ratio of the luminance of the original moving image to the luminance of the adjusted moving image.

3. The video recording apparatus of claim 2 wherein said plurality of tone mapping adjustment curves includes a first tone mapping adjustment curve and a second tone mapping adjustment curve, the curvature of said first tone mapping adjustment curve being smaller than the curvature of said second tone mapping adjustment curve.

4. The image recording apparatus according to claim 3, wherein the plurality of luminance sections include a first luminance section and a second luminance section, wherein the sensitivity of the first luminance section is greater than 800, and the sensitivity of the second luminance section is less than or equal to 800, wherein when the automatic exposure section selects the first luminance section according to the image information of the original moving image, the tone alignment section selects the first tone mapping adjustment curve according to the second instruction to adjust the luminance of the original moving image, and when the automatic exposure section selects the second luminance section according to the image information of the original moving image, the tone alignment section selects the second tone mapping adjustment curve according to the second instruction to adjust the luminance of the original moving image.

5. The video recording apparatus according to claim 2, wherein said plurality of tone mapping adjustment curves includes a first tone mapping adjustment curve, a second tone mapping adjustment curve and a third tone mapping adjustment curve, wherein the curvature of said first tone mapping adjustment curve is smaller than the curvature of said second tone mapping adjustment curve, and the curvature of said second tone mapping adjustment curve is smaller than the curvature of said third tone mapping adjustment curve.

6. The image recording apparatus according to claim 5, wherein the plurality of luminance sections include a first luminance section, a second luminance section and a third luminance section, wherein the sensitivity of the first luminance section is greater than 800, the sensitivity of the second luminance section is less than or equal to 800 and greater than 400, and the sensitivity of the third luminance section is less than or equal to 400, wherein when the automatic exposure section selects the first luminance section according to the image information of the original moving image, the tone alignment section selects the first tone mapping adjustment curve according to the second instruction to adjust the luminance of the original moving image, and when the automatic exposure section selects the second luminance section according to the image information of the original moving image, the tone alignment section selects the second tone mapping adjustment curve according to the second instruction to adjust the luminance of the original moving image, when the automatic exposure part selects the third brightness interval according to the image information of the original dynamic image, the tone adjustment part selects the third tone mapping adjustment curve according to the second instruction to adjust the brightness of the original dynamic image.

7. The image recording device as claimed in claim 1, wherein the image recording device is applied to zigzag high dynamic range images.

8. An image operation method is applied to an image recording device, the image recording device comprises a detection module and an image signal output module, the detection module comprises a detection part, a data statistics part and a tone alignment part, the tone alignment part is provided with a plurality of preset different tone mapping adjustment curves, the image signal output module comprises an automatic exposure part and a dynamic contrast adjustment part, and the automatic exposure part is preset with a plurality of brightness sections, wherein the image operation method comprises the following steps:

(a) the detection part obtains an original dynamic image according to an exposure parameter and outputs the image information of the original dynamic image;

(b) the data statistic part receives the image information of the original dynamic image and carries out statistics to output the image information of the original dynamic image;

(c) the automatic exposure part receives the image information of the original dynamic image from the data statistics part, outputs a first instruction to the detection part according to the image information of the original dynamic image, enables the detection part to adjust the exposure parameter according to the first instruction, compares the closest brightness interval from the multiple brightness intervals according to the image information of the original dynamic image, outputs a second instruction to the tone adjustment part according to the brightness interval, and enables the tone adjustment part to select one tone mapping adjustment curve of the multiple tone mapping adjustment curves according to the second instruction to adjust the brightness of the original dynamic image so as to output the image information of the adjusted dynamic image; and

(d) the dynamic contrast adjusting part receives the image information of the adjusted dynamic image transmitted by the tone adjusting part to correspondingly output the adjusted dynamic image.

Images