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CN100471220C - 在小尺寸显示器上显现大静止画面的方法 - Google Patents

在小尺寸显示器上显现大静止画面的方法 Download PDF

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CN100471220C
CN100471220C CNB2005800050758A CN200580005075A CN100471220C CN 100471220 C CN100471220 C CN 100471220C CN B2005800050758 A CNB2005800050758 A CN B2005800050758A CN 200580005075 A CN200580005075 A CN 200580005075A CN 100471220 C CN100471220 C CN 100471220C
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P·亨特里克
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Abstract

本发明涉及一种在显示器上显现大静止画面的方法,其中该显示器的尺寸小于该大静止画面,所述方法包括以下步骤:将该大静止画面划分成一组片段,所述各片段的尺寸基本上等于该显示器尺寸;根据预定的扫描次序对该大静止画面的各片段进行排序;以及根据所述预定扫描次序、使用预测性的基于块的压缩技术对该组片段进行编码,以便获得视频序列。

Description

在小尺寸显示器上显现大静止画面的方法
发明领域
本发明涉及一种用于在显示器上显现大静止画面的方法和设备,其中该显示器的尺寸小于该大静止画面。
这种方法和设备例如可以被用在移动设备中,比如移动电话或者个人数字助理PDA,其包括一个具有较小尺寸的显示器。
发明背景
欧洲专利申请号EP 1162810公开了一种转换方法,其中使用运动图像数据分布处理来将静止图像分解成多个片段,以便对每一片段进行扩展从而产生多个静止图像,并且根据经扩展的静止图像来产生具有连续静止图像显示格式的数据。对通过分解静止图像而产生的各片段进行连续显示允许用户在小尺寸屏幕(比如移动电话的屏幕)上观看整个图像,而无需缩小该图像。
然而,这种处理是在服务器侧进行的,所述服务器根据所述移动电话的用户的请求将静止图像的各片段的序列发送到该移动电话,所述请求是使用光标来交互地做出的。换句话说,用户不是接收原始的视频序列,而是作为其请求的结果接收静止图像的独立的各片段。因此,无法在移动设备的显示器上方便地观看大静止图像。
发明概要
本发明的一个目的是为用户提出一种更为方便的显现大静止画面的方法。
为此,根据本发明的方法的特征在于其包括以下步骤:
-将大静止画面划分成一组片段,所述各片段的尺寸基本上等于显示器尺寸;
-根据预定的扫描次序对该大静止画面的各片段进行排序;以及
-根据所述预定扫描次序、使用预测性的基于块的压缩技术对该组片段进行编码,以便获得视频序列。
根据本发明的方法允许将大静止画面转换成从该大静止画面得出的较小画面的序列,所述较小画面对应于该大静止画面的各片段。借助于这种转换方法,用户可以以视频序列的形式观看大静止画面,该视频序列是按照预定扫描模式自动生成的。因此,这种转换方法可以更为方便地显现大静止画面,并且其效果比现有技术更有吸引力。
根据本发明的一个实施例,所述大静止画面的各片段彼此重叠,并且所述划分和排序步骤是基于移动镜头(traveling shot),该移动镜头适于覆盖该大静止画面的至少一部分。在这种情况下,由于该大静止画面的每个片段之间的固有的高度线性相关性,最终得到的编码后的视频序列产生高压缩比率。此外,取决于想要的图像质量,编码后的视频序列可以比编码后的大静止画面更小。
根据本发明的另一个实施例,根据本发明的转换方法还包括检测该大静止画面内的轮廓的步骤。在这种情况下,所述划分和排序步骤是基于对通过该检测轮廓的步骤检测出来的轮廓的连续扫描。
根据本发明的又一个实施例,根据本发明的转换方法还包括对该大静止画面的一部分进行缩放的步骤。
本发明还涉及一种用于实施根据本发明的转换方法的设备。
本发明最后涉及一种计算机程序产品,其包括用于实施所述转换方法的程序指令。
参考下面描述的实施例,本发明的这些和其他方面将更加显而易见。
附图简述
下面将通过举例的方式参考附图来更为详细地描述本发明,其中:
图1对应于根据本发明的划分和扫描步骤的实现方式的第一实施例;
图2对应于根据本发明的划分和扫描步骤的实现方式的另一个实施例;以及
图3对应于根据本发明的划分和扫描步骤的实现方式的又一个实施例。
发明的详细描述
本发明涉及一种用于自动将大静止画面转换成视频序列的方法和设备。
所述转换方法使得用户能够逐片段地发现大静止画面。该方法例如可以被用于在小屏幕上发现具有高分辨率的大图像。
所述视频序列是根据下面的转换方法获得的。为了举例说明下面的描述,假设包括1024 x 768个像素的大静止画面,并且我们想要在尺寸为128 x 128像素的屏幕上显示所述画面。该大静止画面例如被存储在远程服务器的存储器中,或者被存储在包括该屏幕的移动设备的存储器中。所述大静止画面按照已编码格式(例如JPEG格式)被存储,或者按照未编码或已解码格式被存储。
如果该大静止画面是按照已编码格式存储的,则根据本发明的转换方法包括根据其编码格式来解码该已编码大静止画面的步骤,以便获得已解码大静止画面。
在下一步骤中,该转换方法包括将该已解码大静止画面划分为一组相同尺寸的片段的步骤,所述各片段的尺寸基本上等于屏幕尺寸,其在这里的例子中是128 x 128像素。本领域技术人员将会明白,该大静止画面的各片段的尺寸不必与屏幕尺寸相同,而是应当与所述屏幕尺寸相近,以便容易地显示在所述屏幕上,也就是说不需要任何进一步的格式转换处理或者只需要简单的格式转换处理。
接着,在下一步骤中,该转换方法包括按照预定扫描次序对该大静止画面的各片段进行排序的步骤。
根据图1所示的本发明的第一实施例,大静止画面(20)的各片段(21)是邻接的,这意味着这里的大静止画面已被划分为48个片段。在这种情况下,该大静止画面被从左到右、接着从上到下、接着从右到左(依此类推)扫描,正如箭头(22)所示。该实施例特别容易实现。
根据图2所示的本发明的另一个实施例,大静止画面(20)的各片段(23)彼此重叠,这意味着这里的大静止画面被划分成超过48个片段。举例来说,如图2所示,在该大静止画面的一行的末尾,如果对应于该大静止画面的一个片段的栅格被从片段的半宽度(在本例中是64像素)水平移位(24)并且被从片段的高度(在本例中是128像素)垂直移位(25),则得出96个片段。随后,该大静止画面被从左到右、接着从上到下、接着从右到左(依此类推)扫描,如箭头(24,25)所示。在这种实施例中,可以以渐进的方式覆盖该大静止画面,就像移动镜头一样。本领域技术人员将会明白,根据所要获得的移动效果以及所要达到的视频序列的存储器尺寸,可以在水平和垂直方向上调节所述移位值。
根据图3所示的本发明的又一个实施例,根据本发明的转换方法包括检测至少一个对象的轮廓的步骤,比如图3所示的足球运动员。所述检测轮廓的步骤例如是基于对梯度滤波器的使用或者基于本领域技术人员已知的任何其他原理。于是所述划分步骤在于用一组片段覆盖该至少一个对象,所述各片段是叠加的或者邻接的,如图3所示。接着,所述排序步骤限定特定的扫描次序(1-15),其例如从左到右并且从上到下跟随所述轮廓,直到到达该对象的中心,正如箭头所示。在最后的步骤中执行缩小(zoom out)以便让观看者发现以较低分辨率被下采样的整个大静止画面,所述经下采样的画面构成所述视频序列的最终画面(16)。借助于这个实施例,仅仅以视频序列的形式向用户提供所述大静止画面的最令人感兴趣或者最有吸引力的区域。
在所述大静止画面的各片段彼此重叠的情况下,如上所述,依照预定的水平和垂直移位来对所述各片段进行移位。本领域技术人员将明白,所述移位的值不必是恒定的,而可以是取决于该大静止画面的内容的变量。举例来说,当各画面片段覆盖足球运动员的面部或者足球时所述移位可以非常小,在这种情况下所述移动镜头较慢。相反,当各片段覆盖足球运动员身体的其他部分时,所述移位可以更大。
本领域技术人员将明白,所述扫描模式绝不限于上述例子。举例来说,该大静止画面不必由一组片段完全覆盖,并且所述大静止画面的覆盖范围也不仅限于该大静止画面的最小部分。作为另一个实例,该大静止画面的某些片段可以具有不同的空间分辨率。例如,当整个视频序列或者该视频序列的一部分对应于该大静止画面的渐进放大或缩小时就是这种情况。
一旦已经限定了所述扫描模式,根据本发明的转换方法包括根据所述扫描次序使用预测性的基于块的压缩技术来对该大静止画面的该组片段进行编码的步骤,以便或者所述视频序列。所述编码步骤例如是基于MPEG-2或者MPEG-4标准,或者基于H.263或H.264标准。
应当注意到,所述解码、划分、排序、(可选地有轮廓检测)以及编码步骤可以由远程服务器执行,最终得到的视频序列被发送到适于播放所述视频序列的移动设备,或者当所述移动设备具有足够的存储器和计算资源时,所述各步骤可以直接由该移动设备执行。
举例来说,如果由远程服务器来执行各不同步骤,则作为原始画面的替换或附加特征,内容发行商(例如在线杂志)可以在其网站上提供高分辨率的照片。作为另一个实例,如果由移动设备来执行各不同步骤,则用户可以将大静止画面转换成视频序列并将其发送给另一个用户(例如通过使用MMS(多媒体消息服务))。
因此,本发明在于一种自动化方法,通过该方法,用户可以选择大静止画面、选择给定的扫描模式(例如上述扫描模式中的一种)并且生成所述视频序列。
为了播放所述视频序列,所述移动设备还包括用于根据其编码格式来解码该视频序列的装置,以及用于呈现和显示解码后的视频序列的装置。用户所得到的结果是非常具有吸引力的视频序列,其允许以非常便利的方式在移动设备的显示器上观看所述大静止画面。
根据本发明的转换方法可以借助于硬件项或者软件项或者二者来实现。所述硬件项或者软件项可以以几种方式来实施,比如分别借助于连线电子电路或者借助于被适当编程的集成电路(例如处理器)。该集成电路可以在便携式设备中获得。该集成电路包括一组指令。因此,例如被包含在该便携式设备的存储器中的该组指令可以使该集成电路执行所述转换方法的不同步骤。可以通过读取诸如盘的数据载体而将该组指令加载到存储器中。服务提供商可以通过诸如因特网的通信网络来提供该组指令。
所附权利要求书中的任何附图标记不应被理解为限制该权利要求。“包括”一词并不排除在任何权利要求中限定的步骤或元件之外的其他步骤或元件的存在。元件或步骤之前的“一个”并不排除多个这种元件或步骤的存在。

Claims (5)

1、一种对大静止画面进行处理以便在显示器上显现该大静止画面的方法,其中该显示器的尺寸小于该大静止画面,所述方法包括以下步骤:
-将该大静止画面划分成一组片段,所述各片段的尺寸等于该显示器尺寸;
-根据预定的扫描次序对该大静止画面的各片段进行排序;
-根据所述预定扫描次序、使用预测性的基于块的压缩技术对该组片段进行编码,以便获得视频序列;以及
-对该视频序列进行解码并且在该显示器上进行显示;
其中,所述大静止画面的各片段彼此重叠,并且所述划分和排序步骤是基于移动镜头,该移动镜头适于覆盖该大静止画面的至少一部分。
2、如权利要求1所述的方法,还包括检测所述大静止画面内的轮廓的步骤。
3、如权利要求2所述的方法,其中,所述划分和排序步骤是基于对通过所述检测轮廓的步骤检测出来的轮廓的连续扫描。
4、如权利要求1所述的方法,还包括对所述大静止画面的一部分进行缩放的步骤。
5、一种用于对大静止画面进行处理以便在显示器上显现该大静止画面的设备,其中该显示器的尺寸小于该大静止画面,所述设备包括
-所述显示器;
-用于将该大静止画面划分成一组片段的装置,所述各片段的尺寸等于该显示器尺寸;
-用于根据预定的扫描次序对该大静止画面的各片段进行排序的装置,所述大静止画面的各片段彼此重叠,并且所述划分和排序步骤是基于移动镜头,该移动镜头适于覆盖该大静止画面的至少一部分;
-编码器,用于根据所述预定扫描次序、使用预测性的基于块的压缩技术对该组片段进行编码,以便获得视频序列;以及
-解码器,用于对该视频序列进行解码并且在该显示器上进行显示。
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